Take the 2-minute tour ×
Cryptography Stack Exchange is a question and answer site for software developers, mathematicians and others interested in cryptography. It's 100% free, no registration required.

Another recent question on security margin included in its answer the discussion of how many rounds are broken so far. What is the definition of a round?

share|improve this question

1 Answer 1

up vote 4 down vote accepted

Many block ciphers are defined by specifying a round and then running that specification multiple times. For example, in AES, a round consists of the operations SubBytes, ShiftRows, MixColumns, AddRoundKey. That is one round and, to get AES, you run that multiple times (plus some setup and some post-processing).

Thus a round is defined by each cipher and typically consists of a number of building blocks that are composed together to create a function that is run multiple times.

share|improve this answer

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.