[Cryptography] [Crypto-practicum] Justify the sequence of operations in CTR mode.
Jerry Leichter
leichter at lrw.com
Sun Feb 21 18:01:32 EST 2016
> Hmmm. What happens if we use a cipher that takes a key 64 bits larger
> than really required to achieve security - say 180 to 256 bits - and
> the key used to encrypt any particular block is the salt (disk sector)
> plus the user's 128-bit secure key?
You're re-inventing tweakable block ciphers. See https://www.cs.berkeley.edu/~daw/papers/tweak-crypto02.pdf
-- Jerry
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