Length-preserving Encryption

An encryption scheme that encrypts a 48-bit message into a ciphertext of length 48 bits usingwith a balanced Feistel network that uses AES as the round function.

References

• Installation: https://github.com/mw866/stream-cipher/blob/master/README.md
• FFX specification: http://csrc.nist.gov/groups/ST/toolkit/BCM/documents/proposedmodes/ffx/ffx-spec2.pdf
• Security of Feistel Rounds:
  • http://www.quadibloc.com/crypto/co040906.htm
  • http://crypto.stackexchange.com/questions/43870/is-3-rounds-feistel-enough-for-making-prp
  • http://crypto.stackexchange.com/questions/32974/example-of-a-prp-that-is-not-a-strong-prp/32977#32977