Bletchley is a cryptography suite which provides tools for encryption, decryption, and cryptanalysis. It is aimed at classical ciphers

It can be used on the cli or in python code

It is not stable, don't expect everything to work right just yet

Bletchley has a number of tools to aid in cryptanalysis, including

1. Statistics

   • Frequency analysis
   • Other things defined in lightbulb

2. Encryption and Decryption of the following ciphers

   • Caesar
   • Multiplication
   • Vigenere
   • Rot13
   • Enigma (through pyenigma)
   • Atbash
   • Playfair
   • Affine
   • Baconian
   • Rail-Fence
   • Substitution
   • Columnar Transposition
   • Autokey
   • Beaufort
   • Porta
   • Running Key
   • Homophonic Substitution
   • Four Square
   • Hill
   • ADFGVX
   • ADFGX
   • Bifid
   • Trifid
   • Straddle Checkerboard
   • Chaocipher

   Also, common encodings such as

   • Base32
   • Base64
   • ASCII85

3. Attempted automated decryption of the following ciphers

   • Caesar
   • Multiplication
   • Vigenere
   • Rot13
   • Enigma (through pyenigma)
   • Atbash
   • Playfair
   • Affine
   • Baconian
   • Rail-Fence
   • Substitution
   • Columnar Transposition
   • Autokey
   • Beaufort
   • Porta
   • Running Key
   • Homophonic Substitution
   • Four Square
   • Hill
   • ADFGVX
   • ADFGX
   • Bifid
   • Trifid
   • Straddle Checkerboard
   • Chaocipher

4. A tool to determine which algorithm was used to make a hash, and a tool to search that hash in various online databases

5. A machine learning tool to guess what cipher was used to encrypt a ciphertext, codenamed lightbulb (still in infancy stages)

The power given by this program is the ability to string various "huts" (tools) together, creating a dynamic solution finding tool.

python3 cli.py

OPTIONS

freq (frequency analysis)

-c,  --chart (Defaults to vbcol if not passed)
    c - count
    p - percentage
    vsbc - Verbose simple bar - count
    vbc - Verbose bar - count
    vsbca - Verbose simple bar - count, alphabetized
    vbca - Verbose bar - count, alphabetized
    vsbcar - Verbose simple bar - count, alphabetized reverse
    vbcar - Verbose bar - count, alphabetized reverse
    vsbcos - Verbose simple bar - count ordered smallest (to largest)
    vbcos - Verbose bar - count ordered smallest (to largest)
    vsbcol - Verbose simple bar - count ordered largest (to smallest)
    vbcol - Verbose bar - count ordered largest (to smallest)

run (try to automatically decrypt ciphertext)

-w, --wordlist
    large
    small
    small_specialized
    large_specialized
    dictionary

-v, --verbose
    - print the results of each test ran (true if passed, false if not)

encrypt (encrypt a text)

1 - Caesar cipher
2 - Vigenere cipher
3 - Rot13
4 - Atbash
5 - Playfair
6 - Baconian
7 - Affine
8 - Rail Fence
9 - Substitution
10 - Beaufort
11 - Autokey
12 - Bifid
13 - Trifid
14 - Multiplicative/Multiplication
15 - Nonsense (github.com/berzerk0/NonsenseCipher)

decrypt (decrypt a text)

measure (measure some characteristic of a text)

classify (use lightbulb to guess what cipher was used to encrypt a text)

EXAMPLES

bletchley freq -t "hello world" -c vbcos
    - Return a bar chart of letter frequency of letter counts smallest to largest

bletchley freq -c p -t "hello world"
    - Return a list of letter frequency in the form of percentages

bletchley freq -t "hello world"
    - Return a bar chart of letter frequency of letter counts largest to smallest

We have word lists for brute forcing keys, measuring language statistics, and machine learning

• small_quotes.txt

  • 10.3M
  • 75,966 lines
  • A list of english quotes

• large_quotes.txt

  • 95.6M
  • 499,714 lines
  • A list of english quotes, some repeats of quotes with changed semantics but same origin

• dictionary.txt

  • 1.1M
  • 116,500 lines
  • A dictionary of english words. Some entries aren't words

• words_dictionary.txt

  • 3.7M
  • 370,101 lines
  • A dictionary larger than dictionary.txt, more relaxed on what counts as a word

• words.txt

  • 151.8K
  • 19,999 lines
  • A file of the top 20000 most commonly used english words (I removed one entry that I don't think is a word)

• words_dictionary_specialized.txt

  • 1.0M
  • 103,669
  • words_dictionary.txt except all words with less than 4 characters and which aren't in dictionary.txt are removed

• words_specialized.txt

  • 146.5K
  • 18,547 lines
  • words.txt except all words with less than 4 characters and which aren't in dictionary.txt are removed

• rockyou.txt

  • 133.4M
  • 14,344,391
  • A standard file used in industry of the most commonly used password gathered from leaked databases

small_quotes.txt - Madadipouya, Kasra. (2016). CSV dataset of 76,000 quotes, suitable for quotes recommender systems or other analysis.. 10.13140/RG.2.1.4386.4561. 

dictionary.txt - https://pypi.org/project/english-dictionary/ Created by Daniel Delluomo 

large_quotes.txt - kaggle.com/datasets/manann/quotes-500k