Cryptif.ai

Deployed at | www.cryptif.co.uk |

A Flask web app for decryption using Statistical techniques.

A personal project for me to learn more about machine learning, handling noisy data and cryptanalysis

Functionality

format text page, allows users to handle large strings and format them

• removing punctuation
• white space
• lower case
• full format

Cryptanalysis page has a modern user friendly front end which allows users to visualise every characteristic of the page

• Frequency comparison bar chart to english language
• index of coincidence comparison bar chart
• chi squared score of cipher text for:
  • monogram
  • bigram
  • trigram
• bhattarayya score of cipher text for:
  • monogram
  • bigram
  • trigram

Encryption page

• encrypt several classical cipher types using reformatted pycipher module

Decryption page

• decrypt several classical cipher types using reformatted pycipher module

AI page

• Implemented KNN model to calculate encryption type

Keyless decryption page

• implemented statistical model to calculate most probable key for monoalphabetic ciphers
• implemented statistical model to calculate most probable key length and key for polyalphabetic ciphers