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Apr
14
answered RFID Protocol Cryptanalysis
Apr
14
comment KDFs for symmetric encryption master key & serial number
The length of the "info" parameter does not matter; it just needs to be unique for each derived key. Or, to put it the other way around, if you feed the same PRK and info parameters to HKDF-Expand, you get the same key out. As for using separate keys for encryption and authentication, many authenticated encryption schemes (including, notably, those based on generic composition of a cipher and a MAC) require it, for their security proofs to be valid.
Apr
12
answered Why do we get the following equation in case of a One Time Pad?
Apr
11
answered Generate secure password hashes without access to PBKDF2 or bcrypt
Apr
10
awarded  Nice Answer
Apr
10
revised algebraic attacks for mixed operations (mod 2 and mod 256)
use \begin{array} for tables
Apr
9
comment Randomness in generation of Virtual Machines from pre-built Image
I suspect this is more of a question for Super User, or maybe Stack Overflow. But yes, in a sensible VM implementation, the guest OS ought to have some way to obtain entropy from the host (or at least have a seed file provided at start-up).
Apr
9
awarded  Informed
Apr
9
comment Should I use ECB or CBC encryption mode for my block cipher?
Let's not expand this answer too much, though -- the fact that it's so short is what lets it be shown in our site tour.
Apr
9
reviewed Reviewed Why is this the inverse of a Enigma Machine rotor?
Apr
9
revised Why is this the inverse of a Enigma Machine rotor?
edited tags; edited tags
Apr
9
answered Why is this the inverse of a Enigma Machine rotor?
Apr
9
reviewed Reviewed Encrypt entire payload or only confidential parts of payload?
Apr
9
revised Encrypt entire payload or only confidential parts of payload?
deleted 1 character in body
Apr
9
reviewed Reviewed Algebraic cryptanalysis on public-key schemes
Apr
9
revised Algebraic cryptanalysis on public-key schemes
fix spelling of "cryptanalysis", misc. copyedits
Apr
9
reviewed Reviewed Is it possible to combine true streaming with AEAD?
Apr
9
reviewed Reviewed KDFs for symmetric encryption master key & serial number
Apr
9
answered KDFs for symmetric encryption master key & serial number
Apr
9
comment KDFs for symmetric encryption master key & serial number
@RichieFrame: Might as well use HKDF-SHA512, so you can say you're using a real standardized KDF. (HKDF is basically just a standardized answer to "How do I use HMAC as a KDF?")