xor-analyze 0.5

xor-analyze provides a program for cryptanalyzing xor "encryption" with variable key length.
Main features:
- Could possibly crack bad implementations of one-time pads
- Check ftp://ftp.habets.pp.se/pub/synscan/ for windows binaries
To find out what length the password is the ciphertext is XOR-ed against itself with different shifts (see XOR_analyze::coincidence() in analyze.cc) and the number of zeroes (equal bytes) are counted. This is called counting coincidences. When the number of zeroes is high the shift value is potentially a multiple of the key length. The one that stands out most is checked with statistics (with a frequency table) to get the key. To check with statistics on all key-lengths in key-length interval (-m and -M) use the -a switch (with -v for one key per keylength)
Compiling
Type make. Mail me if it doesnt compile and dont forget to tell me what kind of system you have.
Encryption
$ ./xor-enc secret file.txt file.xor