diff --git a/.env.example b/.env.example
index 8cb9e7ce..6f73bf52 100644
--- a/.env.example
+++ b/.env.example
@@ -4,4 +4,11 @@ WAF=on
 POW=on
 NONCE_VALIDITY=60000
 INITIAL_DIFFICULTY=13
-BACKEND_URL="http://example.com"
\ No newline at end of file
+BACKEND_URL="http://example.com"
+
+RATE_LIMIT=on
+RATE_LIMIT_SAMPLE_MINUTES=60
+RATE_LIMIT_SESSION_THRESHOLD=100
+RATE_LIMIT_BAN_IP=on
+RATE_LIMIT_IP_THRESHOLD=500
+RATE_LIMIT_BAN_MINUTES=15
\ No newline at end of file
diff --git a/README.md b/README.md
index c674abeb..330a5c32 100644
--- a/README.md
+++ b/README.md
@@ -7,9 +7,14 @@ Project dedicated to provide DDoS protection with proof-of-work
 
 ![screenshot](screenshot.jpg)
 ## Description
-PoW Shield provides DDoS protection on OSI application layer by acting as a proxy between the backend service and the end user. This project aims to provide an alternative to general captcha methods such as Google's ReCaptcha that has always been a pain to solve. Accessing a web service protected by PoW Shield has never been easier, simply go to the url, and your browser will do the rest of the work for you.
+PoW Shield provides DDoS protection on OSI application layer by acting as a proxy that utilizes proof of work between the backend service and the end user. This project aims to provide an alternative to general captcha methods such as Google's ReCaptcha that has always been a pain to solve. Accessing a web service protected by PoW Shield has never been easier, simply go to the url, and your browser will do the rest of the work for you.
 
-[Detailed description and story on Medium](https://ruisiang.medium.com/pow-shield-application-layer-proof-of-work-ddos-filter-4fed32465509 "PoW Shield: Application Layer Proof of Work DDoS Filter") 
+PoW Shield aims to provide the following services bundles in a single webapp / docker image:
++ proof of work authentication
++ ratelimiting and ip blacklisting
++ web application firewall
+
+[Story on Medium](https://ruisiang.medium.com/pow-shield-application-layer-proof-of-work-ddos-filter-4fed32465509 "PoW Shield: Application Layer Proof of Work DDoS Filter") 
 
 ## Usage
 github repo
@@ -31,24 +36,33 @@ see docker-compose.example.yaml
 ```
 
 ## Configuration
-+ PORT: port that PoW Shield listens to
++ PORT: (default:3000) port that PoW Shield listens to
 + SESSION_KEY: secret key for cookie signatures, use a unique one for security reasons, or anyone can forge your signed cookies
-+ WAF: toggles waf functionality on/off (waf is a work in progress)
-+ POW: toggles PoW functionality on/off (if not temporary switched off, why use this project at all?)
-+ NONCE_VALIDITY: specifies the maximum time a nonce has to be submitted to the server after generation(used to enforce difficulty change and filter out stale nonces)
-+ INITIAL_DIFFICULTY: initial difficulty, number of leading 0-bits in produced hash (0:extremely easy ~ 256:impossible, 13(default):takes about 5 seconds for the browser to calculate)
++ WAF: (default:on) toggles waf functionality on/off (waf is a work in progress)
++ POW: (default:on) toggles PoW functionality on/off (if not temporary switched off, why use this project at all?)
++ NONCE_VALIDITY: (default:60000) specifies the maximum seconds a nonce has to be submitted to the server after generation(used to enforce difficulty change and filter out stale nonces)
++ INITIAL_DIFFICULTY: (default:13) initial difficulty, number of leading 0-bits in produced hash (0:extremely easy ~ 256:impossible, 13(default) takes about 5 seconds for the browser to calculate)
 + BACKEND_URL: location to proxy authenticated traffic to, IP and URLs are both accepted(accepts protocol://url(:port) or protocol://ip(:port))
 
++ RATE_LIMIT: (default:on) toggles ratelimit functionality on/off
++ RATE_LIMIT_SAMPLE_MINUTES: (default:60) specifies how many minutes until statistics reset for session/ip 
++ RATE_LIMIT_SESSION_THRESHOLD: (default:100) number of requests that a single session can make until triggering token revokation
++ RATE_LIMIT_BAN_IP: (default:on) toggles ip banning functionality on/off
++ RATE_LIMIT_IP_THRESHOLD: (default:500) number of requests that a single session can make until triggering IP ban
++ RATE_LIMIT_BAN_MINUTES: (default:15) number of minutes that IP ban persists
+
 ## TODOs
 - [x] Web Service Structure
 - [x] Proxy Functionality
 - [x] PoW Implementation
 - [x] Dockerization
+- [x] IP Blacklisting
+- [x] Ratelimiting
 - [ ] WAF Implementation
-- [ ] IP Blacklisting
 - [ ] Dynamic Difficulty
 - [ ] Unit Testing
 - [ ] Multi-Instance Syncing
+- [ ] Monitoring
 
 ## License
 BSD 3-Clause License
diff --git a/app.ts b/app.ts
index 9c7e7aeb..dc2e3d6b 100644
--- a/app.ts
+++ b/app.ts
@@ -4,23 +4,30 @@ import views from 'koa-views'
 import json from 'koa-json'
 import bodyparser from 'koa-bodyparser'
 import logger from 'koa-logger'
-import { createProxyMiddleware, Filter, Options } from 'http-proxy-middleware'
+import { createProxyMiddleware } from 'http-proxy-middleware'
 import c2k from 'koa2-connect'
-import session from 'koa-generic-session'
+import session from 'koa-session-minimal'
 
 import config from './service/config-parser'
 import powRouter from './routes/pow-router'
-import { waf, authorizer } from './service/firewall-service'
+import { controller } from './service/controller-service'
 
-app.keys = [config.get()['session_key']]
+app.keys = [config.session_key]
 app.use(
   session({
     key: 'pow-shield',
+    cookie: {
+      maxAge: 86400000,
+      overwrite: true,
+      httpOnly: true,
+      signed: true,
+      sameSite: 'strict',
+    },
   })
 )
 
 const proxy = createProxyMiddleware(['**', '!/pow'], {
-  target: config.get()['backend_url'],
+  target: config.backend_url,
   changeOrigin: true,
   ws: true,
 })
@@ -50,13 +57,11 @@ app.use(async (ctx, next) => {
 })
 
 // service and routes
-if (config.get()['waf']) {
-  app.use(waf)
-}
-if (config.get()['pow']) {
+if (config.pow) {
   app.use(powRouter.routes())
-  app.use(authorizer)
 }
+app.use(controller)
+
 app.use(c2k(proxy))
 
 // error-handling
diff --git a/docker-compose.example.yaml b/docker-compose.example.yaml
index 4a7aa50a..b8b542f4 100644
--- a/docker-compose.example.yaml
+++ b/docker-compose.example.yaml
@@ -11,6 +11,12 @@ services:
       - NONCE_VALIDITY=60000
       - INITIAL_DIFFICULTY=13
       - BACKEND_URL="http://example.com"
+      - RATE_LIMIT=on
+      - RATE_LIMIT_SAMPLE_MINUTES=60
+      - RATE_LIMIT_SESSION_THRESHOLD=100
+      - RATE_LIMIT_BAN_IP=on
+      - RATE_LIMIT_IP_THRESHOLD=500
+      - RATE_LIMIT_BAN_MINUTES=15
     expose:
       - '3000'
     ports:
diff --git a/lib/pow/verifier.ts b/lib/pow/verifier.ts
index f4e178f6..74c7a1ae 100644
--- a/lib/pow/verifier.ts
+++ b/lib/pow/verifier.ts
@@ -3,7 +3,7 @@ import utils from './utils'
 
 const MIN_NONCE_LEN = 8
 const MAX_NONCE_LEN = 32
-const DEFAULT_VALIDITY = config.get()['nonce_validity']
+const DEFAULT_VALIDITY = config.nonce_validity
 
 export interface IVerifierOptions {
   readonly validity?: number
diff --git a/package-lock.json b/package-lock.json
index 2851dc4d..4c75bbc8 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -79,6 +79,16 @@
         "@types/node": "*"
       }
     },
+    "@types/cron": {
+      "version": "1.7.2",
+      "resolved": "https://registry.npmjs.org/@types/cron/-/cron-1.7.2.tgz",
+      "integrity": "sha512-AEpNLRcsVSc5AdseJKNHpz0d4e8+ow+abTaC0fKDbAU86rF1evoFF0oC2fV9FdqtfVXkG2LKshpLTJCFOpyvTg==",
+      "dev": true,
+      "requires": {
+        "@types/node": "*",
+        "moment": ">=2.14.0"
+      }
+    },
     "@types/debug": {
       "version": "4.1.5",
       "resolved": "https://registry.npmjs.org/@types/debug/-/debug-4.1.5.tgz",
@@ -168,15 +178,6 @@
         "@types/koa": "*"
       }
     },
-    "@types/koa-generic-session": {
-      "version": "1.0.5",
-      "resolved": "https://registry.npmjs.org/@types/koa-generic-session/-/koa-generic-session-1.0.5.tgz",
-      "integrity": "sha512-59FejBbDuQ1JfLVzo0FznuoUIu9nbY0b+NLtUsveTDYCqHlveJluWEFbXOAkxLK0+EPyJ6a+1fCTu3wndbSEcA==",
-      "dev": true,
-      "requires": {
-        "@types/koa": "*"
-      }
-    },
     "@types/koa-json": {
       "version": "2.0.18",
       "resolved": "https://registry.npmjs.org/@types/koa-json/-/koa-json-2.0.18.tgz",
@@ -204,6 +205,16 @@
         "@types/koa": "*"
       }
     },
+    "@types/koa-session-minimal": {
+      "version": "3.0.5",
+      "resolved": "https://registry.npmjs.org/@types/koa-session-minimal/-/koa-session-minimal-3.0.5.tgz",
+      "integrity": "sha512-ITslxknV7uxrt2gksn30YMPaZ2+NeawQIEFYboFUSbDUJHE0DEAvTBLYD5ooMJvyiJ5rlbTZnlCOMExfLANrPw==",
+      "dev": true,
+      "requires": {
+        "@types/cookies": "*",
+        "@types/koa": "*"
+      }
+    },
     "@types/koa-views": {
       "version": "2.0.4",
       "resolved": "https://registry.npmjs.org/@types/koa-views/-/koa-views-2.0.4.tgz",
@@ -222,7 +233,8 @@
     "@types/minimalistic-assert": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/@types/minimalistic-assert/-/minimalistic-assert-1.0.1.tgz",
-      "integrity": "sha512-LjFxDeQtgj+MYOOFuV+BILc/w9ryfxd2eNLF0oJdOBud+xCj80ZAEkAwt6y0qx81QMZ632yAaWdvIMjEK2HcmA=="
+      "integrity": "sha512-LjFxDeQtgj+MYOOFuV+BILc/w9ryfxd2eNLF0oJdOBud+xCj80ZAEkAwt6y0qx81QMZ632yAaWdvIMjEK2HcmA==",
+      "dev": true
     },
     "@types/node": {
       "version": "14.14.32",
@@ -257,6 +269,15 @@
         "@types/node": "*"
       }
     },
+    "@types/sqlite3": {
+      "version": "3.1.7",
+      "resolved": "https://registry.npmjs.org/@types/sqlite3/-/sqlite3-3.1.7.tgz",
+      "integrity": "sha512-8FHV/8Uzd7IwdHm5mvmF2Aif4aC/gjrt4axWD9SmfaxITnOjtOhCbOSTuqv/VbH1uq0QrwlaTj9aTz3gmR6u4w==",
+      "dev": true,
+      "requires": {
+        "@types/node": "*"
+      }
+    },
     "JSONStream": {
       "version": "1.3.5",
       "resolved": "https://registry.npmjs.org/JSONStream/-/JSONStream-1.3.5.tgz",
@@ -308,6 +329,23 @@
       "integrity": "sha512-OPdCF6GsMIP+Az+aWfAAOEt2/+iVDKE7oy6lJ098aoe59oAmK76qV6Gw60SbZ8jHuG2wH058GF4pLFbYamYrVA==",
       "dev": true
     },
+    "ajv": {
+      "version": "6.12.6",
+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.6.tgz",
+      "integrity": "sha512-j3fVLgvTo527anyYyJOGTYJbG+vnnQYvE0m5mmkc1TK+nxAppkCLMIL0aZ4dblVCNoGShhm+kzE4ZUykBoMg4g==",
+      "optional": true,
+      "requires": {
+        "fast-deep-equal": "^3.1.1",
+        "fast-json-stable-stringify": "^2.0.0",
+        "json-schema-traverse": "^0.4.1",
+        "uri-js": "^4.2.2"
+      }
+    },
+    "ansi-regex": {
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
+      "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8="
+    },
     "ansi-styles": {
       "version": "3.2.1",
       "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.1.tgz",
@@ -321,6 +359,20 @@
       "resolved": "https://registry.npmjs.org/any-promise/-/any-promise-1.3.0.tgz",
       "integrity": "sha1-q8av7tzqUugJzcA3au0845Y10X8="
     },
+    "aproba": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/aproba/-/aproba-1.2.0.tgz",
+      "integrity": "sha512-Y9J6ZjXtoYh8RnXVCMOU/ttDmk1aBjunq9vO0ta5x85WDQiQfUF9sIPBITdbiiIVcBo03Hi3jMxigBtsddlXRw=="
+    },
+    "are-we-there-yet": {
+      "version": "1.1.5",
+      "resolved": "https://registry.npmjs.org/are-we-there-yet/-/are-we-there-yet-1.1.5.tgz",
+      "integrity": "sha512-5hYdAkZlcG8tOLujVDTgCT+uPX0VnpAH28gWsLfzpXYm7wP6mp5Q/gYyR7YQ0cKVJcXJnl3j2kpBan13PtQf6w==",
+      "requires": {
+        "delegates": "^1.0.0",
+        "readable-stream": "^2.0.6"
+      }
+    },
     "arr-diff": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/arr-diff/-/arr-diff-4.0.0.tgz",
@@ -342,8 +394,7 @@
     "array-filter": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/array-filter/-/array-filter-1.0.0.tgz",
-      "integrity": "sha1-uveeYubvTCpMC4MSMtr/7CUfnYM=",
-      "dev": true
+      "integrity": "sha1-uveeYubvTCpMC4MSMtr/7CUfnYM="
     },
     "array-uniq": {
       "version": "1.0.2",
@@ -361,6 +412,15 @@
       "resolved": "https://registry.npmjs.org/asap/-/asap-2.0.6.tgz",
       "integrity": "sha1-5QNHYR1+aQlDIIu9r+vLwvuGbUY="
     },
+    "asn1": {
+      "version": "0.2.4",
+      "resolved": "https://registry.npmjs.org/asn1/-/asn1-0.2.4.tgz",
+      "integrity": "sha512-jxwzQpLQjSmWXgwaCZE9Nz+glAG01yF1QnWgbhGwHI5A6FRIEY6IVqtHhIepHqI7/kyEyQEagBC5mBEFlIYvdg==",
+      "optional": true,
+      "requires": {
+        "safer-buffer": "~2.1.0"
+      }
+    },
     "asn1.js": {
       "version": "5.4.1",
       "resolved": "https://registry.npmjs.org/asn1.js/-/asn1.js-5.4.1.tgz",
@@ -413,12 +473,24 @@
       "resolved": "https://registry.npmjs.org/assert-never/-/assert-never-1.2.1.tgz",
       "integrity": "sha512-TaTivMB6pYI1kXwrFlEhLeGfOqoDNdTxjCdwRfFFkEA30Eu+k48W34nlok2EYWJfFFzqaEmichdNM7th6M5HNw=="
     },
+    "assert-plus": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/assert-plus/-/assert-plus-1.0.0.tgz",
+      "integrity": "sha1-8S4PPF13sLHN2RRpQuTpbB5N1SU=",
+      "optional": true
+    },
     "assign-symbols": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/assign-symbols/-/assign-symbols-1.0.0.tgz",
       "integrity": "sha1-WWZ/QfrdTyDMvCu5a41Pf3jsA2c=",
       "dev": true
     },
+    "asynckit": {
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/asynckit/-/asynckit-0.4.0.tgz",
+      "integrity": "sha1-x57Zf380y48robyXkLzDZkdLS3k=",
+      "optional": true
+    },
     "atob": {
       "version": "2.1.2",
       "resolved": "https://registry.npmjs.org/atob/-/atob-2.1.2.tgz",
@@ -429,7 +501,6 @@
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/available-typed-arrays/-/available-typed-arrays-1.0.2.tgz",
       "integrity": "sha512-XWX3OX8Onv97LMk/ftVyBibpGwY5a8SmuxZPzeOxqmuEqUCOM9ZE+uIaD1VNJ5QnvU2UQusvmKbuM1FR8QWGfQ==",
-      "dev": true,
       "requires": {
         "array-filter": "^1.0.0"
       }
@@ -481,6 +552,18 @@
         }
       }
     },
+    "aws-sign2": {
+      "version": "0.7.0",
+      "resolved": "https://registry.npmjs.org/aws-sign2/-/aws-sign2-0.7.0.tgz",
+      "integrity": "sha1-tG6JCTSpWR8tL2+G1+ap8bP+dqg=",
+      "optional": true
+    },
+    "aws4": {
+      "version": "1.11.0",
+      "resolved": "https://registry.npmjs.org/aws4/-/aws4-1.11.0.tgz",
+      "integrity": "sha512-xh1Rl34h6Fi1DC2WWKfxUTVqRsNnr6LsKz2+hfwDxQJWmrx8+c7ylaqBMcHfl1U1r2dsifOvKX3LQuLNZ+XSvA==",
+      "optional": true
+    },
     "babel-walk": {
       "version": "3.0.0-canary-5",
       "resolved": "https://registry.npmjs.org/babel-walk/-/babel-walk-3.0.0-canary-5.tgz",
@@ -561,12 +644,30 @@
       "integrity": "sha512-AKpaYlHn8t4SVbOHCy+b5+KKgvR4vrsD8vbvrbiQJps7fKDTkjkDry6ji0rUJjC0kzbNePLwzxq8iypo41qeWA==",
       "dev": true
     },
+    "bcrypt-pbkdf": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/bcrypt-pbkdf/-/bcrypt-pbkdf-1.0.2.tgz",
+      "integrity": "sha1-pDAdOJtqQ/m2f/PKEaP2Y342Dp4=",
+      "optional": true,
+      "requires": {
+        "tweetnacl": "^0.14.3"
+      }
+    },
     "big.js": {
       "version": "5.2.2",
       "resolved": "https://registry.npmjs.org/big.js/-/big.js-5.2.2.tgz",
       "integrity": "sha512-vyL2OymJxmarO8gxMr0mhChsO9QGwhynfuu4+MHTAW6czfq9humCB7rKpUjDd9YUiDPU4mzpyupFSvOClAwbmQ==",
       "dev": true
     },
+    "block-stream": {
+      "version": "0.0.9",
+      "resolved": "https://registry.npmjs.org/block-stream/-/block-stream-0.0.9.tgz",
+      "integrity": "sha1-E+v+d4oDIFz+A3UUgeu0szAMEmo=",
+      "optional": true,
+      "requires": {
+        "inherits": "~2.0.0"
+      }
+    },
     "bluebird": {
       "version": "3.7.2",
       "resolved": "https://registry.npmjs.org/bluebird/-/bluebird-3.7.2.tgz",
@@ -864,6 +965,12 @@
         "get-intrinsic": "^1.0.2"
       }
     },
+    "caseless": {
+      "version": "0.12.0",
+      "resolved": "https://registry.npmjs.org/caseless/-/caseless-0.12.0.tgz",
+      "integrity": "sha1-G2gcIf+EAzyCZUMJBolCDRhxUdw=",
+      "optional": true
+    },
     "chalk": {
       "version": "2.4.2",
       "resolved": "https://registry.npmjs.org/chalk/-/chalk-2.4.2.tgz",
@@ -882,6 +989,11 @@
         "is-regex": "^1.0.3"
       }
     },
+    "chownr": {
+      "version": "1.1.4",
+      "resolved": "https://registry.npmjs.org/chownr/-/chownr-1.1.4.tgz",
+      "integrity": "sha512-jJ0bqzaylmJtVnNgzTeSOs8DPavpbYgEr/b0YL8/2GO3xJEhInFmhKMUnEJQjZumK7KXGFhUy89PrsJWlakBVg=="
+    },
     "cipher-base": {
       "version": "1.0.4",
       "resolved": "https://registry.npmjs.org/cipher-base/-/cipher-base-1.0.4.tgz",
@@ -930,6 +1042,11 @@
         "type-is": "^1.6.16"
       }
     },
+    "code-point-at": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/code-point-at/-/code-point-at-1.1.0.tgz",
+      "integrity": "sha1-DQcLTQQ6W+ozovGkDi7bPZpMz3c="
+    },
     "collection-visit": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/collection-visit/-/collection-visit-1.0.0.tgz",
@@ -979,6 +1096,15 @@
         }
       }
     },
+    "combined-stream": {
+      "version": "1.0.8",
+      "resolved": "https://registry.npmjs.org/combined-stream/-/combined-stream-1.0.8.tgz",
+      "integrity": "sha512-FQN4MRfuJeHf7cBbBMJFXhKSDq+2kAArBlmRBvcvFE5BB1HZKXtSFASDhdlz9zOYwxh8lDdnvmMOe/+5cdoEdg==",
+      "optional": true,
+      "requires": {
+        "delayed-stream": "~1.0.0"
+      }
+    },
     "commander": {
       "version": "2.20.3",
       "resolved": "https://registry.npmjs.org/commander/-/commander-2.20.3.tgz",
@@ -1032,6 +1158,11 @@
       "integrity": "sha512-ZMkYO/LkF17QvCPqM0gxw8yUzigAOZOSWSHg91FH6orS7vcEj5dVZTidN2fQ14yBSdg97RqhSNwLUXInd52OTA==",
       "dev": true
     },
+    "console-control-strings": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/console-control-strings/-/console-control-strings-1.1.0.tgz",
+      "integrity": "sha1-PXz0Rk22RG6mRL9LOVB/mFEAjo4="
+    },
     "consolidate": {
       "version": "0.15.1",
       "resolved": "https://registry.npmjs.org/consolidate/-/consolidate-0.15.1.tgz",
@@ -1099,11 +1230,6 @@
       "resolved": "https://registry.npmjs.org/core-util-is/-/core-util-is-1.0.2.tgz",
       "integrity": "sha1-tf1UIgqivFq1eqtxQMlAdUUDwac="
     },
-    "crc": {
-      "version": "3.5.0",
-      "resolved": "https://registry.npmjs.org/crc/-/crc-3.5.0.tgz",
-      "integrity": "sha1-mLi6fUiWZbo5efWbITgTdBAaGWQ="
-    },
     "create-ecdh": {
       "version": "4.0.4",
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@@ -1148,6 +1274,14 @@
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     "tsscmp": {
       "version": "1.0.6",
       "resolved": "https://registry.npmjs.org/tsscmp/-/tsscmp-1.0.6.tgz",
@@ -4009,6 +4816,21 @@
       "integrity": "sha512-C3TaO7K81YvjCgQH9Q1S3R3P3BtN3RIM8n+OvX4il1K1zgE8ZhI0op7kClgkxtutIE8hQrcrHBXvIheqKUUCxw==",
       "dev": true
     },
+    "tunnel-agent": {
+      "version": "0.6.0",
+      "resolved": "https://registry.npmjs.org/tunnel-agent/-/tunnel-agent-0.6.0.tgz",
+      "integrity": "sha1-J6XeoGs2sEoKmWZ3SykIaPD8QP0=",
+      "optional": true,
+      "requires": {
+        "safe-buffer": "^5.0.1"
+      }
+    },
+    "tweetnacl": {
+      "version": "0.14.5",
+      "resolved": "https://registry.npmjs.org/tweetnacl/-/tweetnacl-0.14.5.tgz",
+      "integrity": "sha1-WuaBd/GS1EViadEIr6k/+HQ/T2Q=",
+      "optional": true
+    },
     "type": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/type/-/type-1.2.0.tgz",
@@ -4086,7 +4908,6 @@
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/unbox-primitive/-/unbox-primitive-1.0.0.tgz",
       "integrity": "sha512-P/51NX+JXyxK/aigg1/ZgyccdAxm5K1+n8+tvqSntjOivPt19gvm1VC49RWYetsiub8WViUchdxl/KWHHB0kzA==",
-      "dev": true,
       "requires": {
         "function-bind": "^1.1.1",
         "has-bigints": "^1.0.0",
@@ -4164,6 +4985,15 @@
         }
       }
     },
+    "uri-js": {
+      "version": "4.4.1",
+      "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.4.1.tgz",
+      "integrity": "sha512-7rKUyy33Q1yc98pQ1DAmLtwX109F7TIfWlW1Ydo8Wl1ii1SeHieeh0HHfPeL2fMXK6z0s8ecKs9frCuLJvndBg==",
+      "optional": true,
+      "requires": {
+        "punycode": "^2.1.0"
+      }
+    },
     "urix": {
       "version": "0.1.0",
       "resolved": "https://registry.npmjs.org/urix/-/urix-0.1.0.tgz",
@@ -4216,14 +5046,24 @@
     "uuid": {
       "version": "3.4.0",
       "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.4.0.tgz",
-      "integrity": "sha512-HjSDRw6gZE5JMggctHBcjVak08+KEVhSIiDzFnT9S9aegmp85S/bReBVTb4QTFaRNptJ9kuYaNhnbNEOkbKb/A==",
-      "dev": true
+      "integrity": "sha512-HjSDRw6gZE5JMggctHBcjVak08+KEVhSIiDzFnT9S9aegmp85S/bReBVTb4QTFaRNptJ9kuYaNhnbNEOkbKb/A=="
     },
     "vary": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
       "integrity": "sha1-IpnwLG3tMNSllhsLn3RSShj2NPw="
     },
+    "verror": {
+      "version": "1.10.0",
+      "resolved": "https://registry.npmjs.org/verror/-/verror-1.10.0.tgz",
+      "integrity": "sha1-OhBcoXBTr1XW4nDB+CiGguGNpAA=",
+      "optional": true,
+      "requires": {
+        "assert-plus": "^1.0.0",
+        "core-util-is": "1.0.2",
+        "extsprintf": "^1.2.0"
+      }
+    },
     "vm-browserify": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/vm-browserify/-/vm-browserify-1.1.2.tgz",
@@ -4247,11 +5087,19 @@
         "uuid": "^3.1.0"
       }
     },
+    "which": {
+      "version": "1.3.1",
+      "resolved": "https://registry.npmjs.org/which/-/which-1.3.1.tgz",
+      "integrity": "sha512-HxJdYWq1MTIQbJ3nw0cqssHoTNU267KlrDuGZ1WYlxDStUtKUhOaJmh112/TZmHxxUfuJqPXSOm7tDyas0OSIQ==",
+      "optional": true,
+      "requires": {
+        "isexe": "^2.0.0"
+      }
+    },
     "which-boxed-primitive": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/which-boxed-primitive/-/which-boxed-primitive-1.0.2.tgz",
       "integrity": "sha512-bwZdv0AKLpplFY2KZRX6TvyuN7ojjr7lwkg6ml0roIy9YeuSr7JS372qlNW18UQYzgYK9ziGcerWqZOmEn9VNg==",
-      "dev": true,
       "requires": {
         "is-bigint": "^1.0.1",
         "is-boolean-object": "^1.1.0",
@@ -4260,11 +5108,21 @@
         "is-symbol": "^1.0.3"
       }
     },
+    "which-collection": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/which-collection/-/which-collection-1.0.1.tgz",
+      "integrity": "sha512-W8xeTUwaln8i3K/cY1nGXzdnVZlidBcagyNFtBdD5kxnb4TvGKR7FfSIS3mYpwWS1QUCutfKz8IY8RjftB0+1A==",
+      "requires": {
+        "is-map": "^2.0.1",
+        "is-set": "^2.0.1",
+        "is-weakmap": "^2.0.1",
+        "is-weakset": "^2.0.1"
+      }
+    },
     "which-typed-array": {
       "version": "1.1.4",
       "resolved": "https://registry.npmjs.org/which-typed-array/-/which-typed-array-1.1.4.tgz",
       "integrity": "sha512-49E0SpUe90cjpoc7BOJwyPHRqSAd12c10Qm2amdEZrJPCY2NDxaW01zHITrem+rnETY3dwrbH3UUrUwagfCYDA==",
-      "dev": true,
       "requires": {
         "available-typed-arrays": "^1.0.2",
         "call-bind": "^1.0.0",
@@ -4275,6 +5133,14 @@
         "is-typed-array": "^1.1.3"
       }
     },
+    "wide-align": {
+      "version": "1.1.3",
+      "resolved": "https://registry.npmjs.org/wide-align/-/wide-align-1.1.3.tgz",
+      "integrity": "sha512-QGkOQc8XL6Bt5PwnsExKBPuMKBxnGxWWW3fU55Xt4feHozMUhdUMaBCk290qpm/wG5u/RSKzwdAC4i51YigihA==",
+      "requires": {
+        "string-width": "^1.0.2 || 2"
+      }
+    },
     "with": {
       "version": "7.0.2",
       "resolved": "https://registry.npmjs.org/with/-/with-7.0.2.tgz",
diff --git a/package.json b/package.json
index 04a07672..0b02bfa5 100644
--- a/package.json
+++ b/package.json
@@ -9,36 +9,41 @@
     "update-static": "bash scripts/update-static.sh"
   },
   "dependencies": {
-    "@types/minimalistic-assert": "^1.0.1",
     "create-hash": "^1.2.0",
+    "cron": "^1.8.2",
     "debug": "^4.1.1",
     "dotenv": "^8.2.0",
     "http-proxy-middleware": "^1.0.6",
     "koa": "^2.7.0",
     "koa-bodyparser": "^4.2.1",
-    "koa-generic-session": "^2.1.1",
     "koa-json": "^2.0.2",
     "koa-logger": "^3.2.0",
     "koa-router": "^10.0.0",
+    "koa-session-minimal": "^4.0.1",
     "koa-static": "^5.0.0",
     "koa-views": "^6.3.1",
     "koa2-connect": "^1.0.2",
     "minimalistic-assert": "^1.0.1",
+    "moment": "^2.29.1",
     "pug": "^3.0.1",
     "randomstring": "^1.1.5",
-    "source-map-loader": "^2.0.1"
+    "source-map-loader": "^2.0.1",
+    "sqlite3": "^5.0.2"
   },
   "devDependencies": {
     "@types/create-hash": "^1.2.2",
+    "@types/cron": "^1.7.2",
     "@types/debug": "^4.1.5",
     "@types/koa": "^2.11.3",
     "@types/koa-bodyparser": "^4.3.0",
-    "@types/koa-generic-session": "^1.0.5",
     "@types/koa-json": "^2.0.18",
     "@types/koa-logger": "^3.1.1",
     "@types/koa-router": "^7.4.1",
+    "@types/koa-session-minimal": "^3.0.5",
     "@types/koa-views": "^2.0.4",
+    "@types/minimalistic-assert": "^1.0.1",
     "@types/randomstring": "^1.1.6",
+    "@types/sqlite3": "^3.1.7",
     "awesome-typescript-loader": "^5.2.1",
     "browserify": "^17.0.0",
     "typescript": "^4.2.3",
diff --git a/routes/pow-router.ts b/routes/pow-router.ts
index 112d4d37..aa91be5f 100644
--- a/routes/pow-router.ts
+++ b/routes/pow-router.ts
@@ -5,7 +5,7 @@ import Pow from '../service/pow-service'
 import config from '../service/config-parser'
 
 const router = new Router()
-const pow = new Pow(config.get()['initial_difficulty'])
+const pow = new Pow(config.initial_difficulty)
 
 router.prefix('/pow')
 
@@ -20,11 +20,17 @@ router.get('/', async (ctx: Koa.ParameterizedContext, next: Koa.Next) => {
 })
 
 router.post('/', async (ctx: Koa.ParameterizedContext, next: Koa.Next) => {
+  if (!ctx.session) {
+    return
+  }
   if (await pow.parseAndVerify(ctx.request.body, ctx.session)) {
     ctx.session.authorized = true
     ctx.status = 200
   } else {
-    Object.assign(ctx.session, { difficulty: null, prefix: null })
+    Object.assign(ctx.session, {
+      difficulty: null,
+      prefix: null,
+    })
     ctx.status = 401
   }
 })
diff --git a/service/config-parser.ts b/service/config-parser.ts
index ee98db1a..fe88c813 100644
--- a/service/config-parser.ts
+++ b/service/config-parser.ts
@@ -9,17 +9,31 @@ interface Config {
   nonce_validity: number
   initial_difficulty: number
   backend_url: string
+  rate_limit: boolean
+  rate_limit_sample_minutes: number
+  rate_limit_session_threshold: number
+  rate_limit_ban_ip: boolean
+  rate_limit_ip_threshold: number
+  rate_limit_ban_minutes: number
 }
 
-const getConfig = (): Config => {
-  return {
-    session_key: process.env.SESSION_KEY || 'abcdefghijklmnop',
-    waf: process.env.WAF == 'on' || true,
-    pow: process.env.POW == 'on' || true,
-    nonce_validity: parseInt(process.env.NONCE_VALIDITY || '') || 60 * 1000,
-    initial_difficulty: parseInt(process.env.INITIAL_DIFFICULTY || '') || 13,
-    backend_url: process.env.BACKEND_URL || 'http://www.example.com',
-  }
+const config: Config = {
+  session_key: process.env.SESSION_KEY || 'abcdefghijklmnop',
+  waf: (process.env.WAF || 'on') == 'on',
+  pow: (process.env.POW || 'on') == 'on',
+  nonce_validity: parseInt(process.env.NONCE_VALIDITY || '') || 60 * 1000,
+  initial_difficulty: parseInt(process.env.INITIAL_DIFFICULTY || '') || 13,
+  backend_url: process.env.BACKEND_URL || 'http://www.example.com',
+  rate_limit: (process.env.RATE_LIMIT || 'on') == 'on',
+  rate_limit_sample_minutes: parseInt(
+    process.env.RATE_LIMIT_SAMPLE_MINUTES || '60'
+  ),
+  rate_limit_session_threshold: parseInt(
+    process.env.RATE_LIMIT_SESSION_THRESHOLD || '100'
+  ),
+  rate_limit_ban_ip: (process.env.RATE_LIMIT_BAN_IP || 'on') == 'on',
+  rate_limit_ip_threshold: parseInt(process.env.RATE_LIMIT_IP_THRESHOLD || '500'),
+  rate_limit_ban_minutes: parseInt(process.env.RATE_LIMIT_BAN_MINUTES || '15'),
 }
 
-export default { get: getConfig }
+export default config
diff --git a/service/controller-service.ts b/service/controller-service.ts
new file mode 100644
index 00000000..7ecf578d
--- /dev/null
+++ b/service/controller-service.ts
@@ -0,0 +1,29 @@
+import Koa from 'koa'
+import blacklist from './controllers/blacklist'
+import config from './config-parser'
+import rateLimiter from './controllers/rate-limiter'
+
+export const controller: Koa.Middleware = async function (
+  ctx: Koa.ParameterizedContext,
+  next: Koa.Next
+) {
+  if ((await blacklist.check(ctx.ip, ctx.session)) || !config.rate_limit) {
+    if (!!ctx.session.authorized || !config.pow) {
+      Object.assign(ctx.session, await rateLimiter.process(ctx.ip, ctx.session))
+      next()
+    } else {
+      if (ctx.request.url == '/') {
+        ctx.redirect('/pow')
+      } else {
+        ctx.redirect(`/pow?redirect=${ctx.request.url}`)
+      }
+    }
+  } else {
+    ctx.status = 403
+    await ctx.render('banned')
+  }
+}
+
+const inspect = async (ctx: Koa.ParameterizedContext) => {
+  //waf placeholder
+}
diff --git a/service/controllers/blacklist.ts b/service/controllers/blacklist.ts
new file mode 100644
index 00000000..8e01a087
--- /dev/null
+++ b/service/controllers/blacklist.ts
@@ -0,0 +1,39 @@
+import { CronJob } from 'cron'
+import db from '../database-service'
+
+class Blacklist {
+  constructor() {
+    this.job.start()
+  }
+  public check = async (ip: string, session: { banned: boolean }) => {
+    if (!session.banned) {
+      const dbQuery = await db.queryAsync({
+        sql: 'select * from blacklist where ip=?',
+        values: [ip],
+      })
+      if (!dbQuery.length) {
+        return true
+      }
+    }
+    return false
+  }
+  public ban = async (ip: string, minutes?: number) => {
+    minutes = minutes || 15
+    await db.queryAsync({
+      sql: `insert into blacklist (ip, expiry) values(?, datetime(CURRENT_TIMESTAMP, "+${minutes} minutes"))`,
+      values: [ip],
+    })
+  }
+  private removeExpired = async () => {
+    await db.queryAsync({
+      sql: 'delete from blacklist where expiry<datetime(CURRENT_TIMESTAMP)',
+      values: [],
+    })
+  }
+  private job = new CronJob('0 */10 * * * *', async () => {
+    await this.removeExpired()
+  })
+}
+
+const blacklist = new Blacklist()
+export default blacklist
diff --git a/service/controllers/rate-limiter.ts b/service/controllers/rate-limiter.ts
new file mode 100644
index 00000000..6e263a6f
--- /dev/null
+++ b/service/controllers/rate-limiter.ts
@@ -0,0 +1,80 @@
+import moment from 'moment'
+import { CronJob } from 'cron'
+import db from '../database-service'
+import blacklist from './blacklist'
+import config from '../config-parser'
+
+class RateLimiter {
+  constructor() {
+    this.job.start()
+  }
+  public process = async (
+    ip: string,
+    session: {
+      requests: number
+      timestamp: string
+      authorized: boolean
+    }
+  ) => {
+    if (!session.requests) {
+      session.requests = 0
+    }
+    if (!session.timestamp) {
+      session.timestamp = moment().toString()
+    }
+    if (
+      moment(new Date(session.timestamp)).add(
+        config.rate_limit_sample_minutes,
+        'minutes'
+      ) < moment()
+    ) {
+      session.requests = 0
+      session.timestamp = moment().toString()
+    }
+    if (session.requests >= config.rate_limit_session_threshold) {
+      session.requests = 0
+      session.timestamp = moment().toString()
+      session.authorized = false
+    }
+    if ((await this.get(ip)) >= config.rate_limit_ip_threshold) {
+      if (config.rate_limit_ban_ip) {
+        await blacklist.ban(ip, config.rate_limit_ban_minutes)
+      }
+    }
+    session.requests++
+    await this.add(ip)
+    return {
+      requests: session.requests,
+      timestamp: session.timestamp,
+      authorized: session.authorized,
+    }
+  }
+  private add = async (ip: string) => {
+    await db.queryAsync({
+      sql: `insert into requests (ip, expiry, requests) values(?, datetime(CURRENT_TIMESTAMP, "+${config.rate_limit_sample_minutes} minutes"), 0) on conflict(ip) do update set requests=requests+1`,
+      values: [ip],
+    })
+  }
+  private get = async (ip: string) => {
+    const dbQuery = await db.queryAsync({
+      sql: 'select requests from requests where ip=?',
+      values: [ip],
+    })
+    if (!dbQuery.length) {
+      return 0
+    } else {
+      return dbQuery[0].requests
+    }
+  }
+  private removeExpired = async () => {
+    await db.queryAsync({
+      sql: 'delete from requests where expiry<datetime(CURRENT_TIMESTAMP)',
+      values: [],
+    })
+  }
+  private job = new CronJob('0 */10 * * * *', async () => {
+    await this.removeExpired()
+  })
+}
+const rateLimiter = new RateLimiter()
+export default rateLimiter
diff --git a/service/database-service.ts b/service/database-service.ts
new file mode 100644
index 00000000..afbaf4b6
--- /dev/null
+++ b/service/database-service.ts
@@ -0,0 +1,38 @@
+import { verbose as sqlite3 } from 'sqlite3'
+
+class Database {
+  private sqliteDb = new (sqlite3().Database)(':memory:')
+  constructor() {
+    this.sqliteDb.run(
+      'create table if not exists blacklist (ip text unique, expiry text)'
+    )
+    this.sqliteDb.run(
+      'create table if not exists requests (ip text unique, expiry text, requests int)'
+    )
+  }
+
+  private sqliteQuery = async (
+    query: string,
+    params: string[] | undefined
+  ): Promise<any[]> => {
+    if (!params) {
+      params = []
+    }
+    const that = this
+    return new Promise((resolve, reject) => {
+      that.sqliteDb.all(query, params, (err, rows) => {
+        if (err) {
+          reject(err)
+        } else {
+          resolve(rows)
+        }
+      })
+    })
+  }
+
+  public queryAsync = async (data: { sql: string; values: string[] }) => {
+    return await this.sqliteQuery(data.sql, data.values)
+  }
+}
+const database = new Database()
+export default database
diff --git a/service/firewall-service.ts b/service/firewall-service.ts
deleted file mode 100644
index 267529f4..00000000
--- a/service/firewall-service.ts
+++ /dev/null
@@ -1,21 +0,0 @@
-import Koa from 'koa'
-
-export const authorizer = async (
-  ctx: Koa.ParameterizedContext,
-  next: Koa.Next
-) => {
-  if (!!ctx.session.authorized) {
-    await next()
-  } else {
-    if (ctx.request.url == '/') {
-      ctx.redirect('/pow')
-    } else {
-      ctx.redirect(`/pow?redirect=${ctx.request.url}`)
-    }
-  }
-}
-
-export const waf = async (ctx: Koa.ParameterizedContext, next: Koa.Next) => {
-  //placeholder
-  await next()
-}
diff --git a/views/banned.pug b/views/banned.pug
new file mode 100644
index 00000000..e78bf0ad
--- /dev/null
+++ b/views/banned.pug
@@ -0,0 +1,13 @@
+doctype html
+html
+  head
+    meta(charset='utf-8')
+    meta(http-equiv='X-UA-Compatible' content='IE=edge')
+    meta(name='viewport' content='width=device-width, initial-scale=1')
+    title PoW-Guard
+    link(rel='stylesheet', href='/stylesheets/style.css')
+    script(src='/javascripts/bundle.min.js')
+  body
+    .container
+      h1 PoW Shield
+      p Your IP has triggered internal rules and will be banned for a period of time
diff --git a/views/error.pug b/views/error.pug
index 4a8c9ea2..53c9aa42 100644
--- a/views/error.pug
+++ b/views/error.pug
@@ -2,7 +2,6 @@ doctype html
 html
   head
     title Error
-    link(rel='stylesheet', href='/stylesheets/style.css')
   body
     h1= message
     h2= error.status