OCTADE on Nostr: 'period' 'cipher period' 'periodic range' 'periodic limit' 'periodicity' This is not ...
'period'
'cipher period'
'periodic range'
'periodic limit'
'periodicity'
This is not to be confused with 'cryptoperiod' or 'key period' or 'key time domain' which refers to the time a key is valid.
The 'period' refers to the length of the cipher stream or generator stream before it repeats from the initial keying or initialization state. Some ciphers may be considered unsafe before reaching this generator period for other reasons, such as mode mixing.
For example we might say the generator period is 2^155337 which means after generating that much data the stream would cycle back to its initial values. If the amount of data fed into the cipher stream exceeds the periodic security is compromised (theoretically, in practice it might be unnoticed by an attacker).
Last I checked AES has a period of something like 2^39 - 256 for the same key. Your key schedule should be automatically handling that anyway to a much smaller limit.
The cipher period limitation may be referred to as:
'maximum safe ciphertext length' or 'maximum safe message size'
'cipher period'
'periodic range'
'periodic limit'
'periodicity'
This is not to be confused with 'cryptoperiod' or 'key period' or 'key time domain' which refers to the time a key is valid.
The 'period' refers to the length of the cipher stream or generator stream before it repeats from the initial keying or initialization state. Some ciphers may be considered unsafe before reaching this generator period for other reasons, such as mode mixing.
For example we might say the generator period is 2^155337 which means after generating that much data the stream would cycle back to its initial values. If the amount of data fed into the cipher stream exceeds the periodic security is compromised (theoretically, in practice it might be unnoticed by an attacker).
Last I checked AES has a period of something like 2^39 - 256 for the same key. Your key schedule should be automatically handling that anyway to a much smaller limit.
The cipher period limitation may be referred to as:
'maximum safe ciphertext length' or 'maximum safe message size'