Cryptanalysis Helper

++A compact and portable offline tool for cryptanalysis++

CryptanalysisHelper is a small utility written in pure Java 8, that can help with basic cryptanalysis. Only supports English.

The current features are:

1. Shift Cipher

• Encrypt single plaintext
• Decrypt single plaintext

• Brute force the key (i.e. shift=5)

  2. Simple XOR Cipher (can handle input of any Unicode codepoint)

• Decrypt single plaintext automatically.
• Decrypt single plaintext that uses 2 keystreams (alternately) automatically, but keystream-1 must be provided.
• Brute force all possible values for keystream-2, by providing keystream-1.

• Encrypt single plaintext with 1 or 2 keysteams (COMING SOON)

  3. Columnar Transposition Cipher (can handle keys with length up to 10 characters)

• Decrypt cipher and guess key automatically.

• Brute force all possible permutations of plaintext.

  4. Frequency Analysis

• View statistics about the English language and also about the cipher that is currently being analysed.
• Perform substitutions in real time.
• Save progress (COMING SOON)

• Ability to open semi-complete analysis. User can provide partial key (COMING SOON)

  5. Substitution Cipher (COMING SOON) -both monoalphabetic and polyalphabetic

• Decrypt a substitution cipher and guess the key automatically (COMING SOON)

• Encrypt a single plaintext as a substitution cipher (either by providing the key or by randomly generating one) (COMING SOON)

  6. Can store results to disk