2014 | OriginalPaper | Buchkapitel
FNR: Arbitrary Length Small Domain Block Cipher Proposal
verfasst von : Sashank Dara, Scott Fluhrer
Erschienen in: Security, Privacy, and Applied Cryptography Engineering
Verlag: Springer International Publishing
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We propose a practical flexible (or arbitrary) length small domain block cipher,
FNR
encryption scheme. FNR denotes
F
lexible
N
aor and
R
eingold. It can cipher small domain data formats like IPv4, Port numbers, MAC Addresses, Credit card numbers, any random short strings while preserving their input length. In addition to the classic Feistel networks, Naor and Reingold propose usage of Pair-wise independent permutation (PwIP) functions based on Galois Field GF(2
n
). Instead we propose usage of random
N
×
N
Invertible matrices in GF(2).