mitmcracker

Golang Key Cracker Which Implements Meet In the Middle Strategy.

Given a known cipher-text and a known plain-text, it finds two keys k1 and k2 in a way that Ek1(plain) == Dk2(cipher) where E is the encryption function and D is the decryption function.

It tries all the possible keys in the range of 24/28/32 bits and prints which are the keys to be used for the encryption and decryption.

Keys can only be 6/7/8 Digits HEX and Cipher/Plain can only be 16 Digits HEX.

What you need to run the project:

• Go: ~v1.15
• Ocaml: ~v4.08.1

How to run the app

From the root of the project:

• build the go/ocaml binaries: make
• run the command: ./mitmcracker -key=$keyLength -encoded=$encodedMsg -plain=$plainMsg

Known Inputs/Outputs

• 24-bit:
  • plain: C330C9CBD01DFBA0
  • encoded: E10C65124518DB05
  • encoding key to be found: 6d3952
  • decoding key to be found: 513346
• 28-bit:
  • plain: 492A5BB83F8A3F95
  • encoded: 47090A6AC4A56798
  • encoding key to be found: ???????
  • decoding key to be found: ???????
• 32-bit:
  • plain: FFC7C9E5694ABFF7
  • encoded: 98AC59F25448FFAC
  • encoding key to be found: ????????
  • decoding key to be found: ????????

When Ek1(C) == Dk2(P) you found the right keys k1, k2 to read all encrypted messages.