30 Apr
2003
30 Apr
'03
6:21 p.m.
What is not known (and impossible to prove impossible) is that there may be another non-DES "block cypher" with some shorter key equivalent to 2 DES blocks in series. Or we'll find out much later that feistel nets have been collapsed in, say ... late 90-ties ?
if I'm wrong, but what is important for multiple encryption is whether or not the cypher in question is a group (as in closed under composition).
DES, for example, is not, so multiple DES cycles is not equivalent to single DES.
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