SlunkCrypt is an experimental cross-platform cryptography library and command-line tool. A fully-featured GUI is provided for the Windows platform.

The SlunkCrypt algorithm is based on core concepts of the well-known Enigma machine but with numerous improvements, largely inspired by R. Anderson’s “A Modern Rotor Machine”

- The original Enigma machine had only three (or, in some models, four) rotors, plus a static “reflector” wheel. In SlunkCrypt, we uses 256 simulated rotors for an improved security. Furthermore, the original Enigma machine supported only 26 distinct symbols, i.e. the letters A to Z. In SlunkCrypt, we use 256 distinct symbols, i.e. the byte values 0x00 to 0xFF, which allows the encryption (and decryption) of arbitrary streams of bytes, rather than just plain text. Of course, SlunkCrypt can encrypt (and decrypt) text files as well.

- In the original Enigma machine, the rightmost rotor was moved, by one step, after every symbol. Meanwhile, all other rotors were moved, by one step, only when their right-hand neighbor had completed a full turn – much like the odometer in a car. The fact that most of the rotors remained in the same “static” position most of the time was an important weakness of the Enigma machine. Also, the sequence of the Enigma’s rotor positions started to repeat after only 16,900 characters. SlunkCrypt employs an improved stepping algorithm, based on a linear-feedback shift register (LSFR), ensuring that all rotors move frequently and in a “randomized” unpredictable pattern. The rotor positions of SlunkCrypt practically never repeat.