[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: triple DES
> From ipsec-request@ans.net Wed Jan 18 14:44 PST 1995
>
> What is the usual method for doing triple DES with CBC?
>
The way we do this is to do Encrypt-Decrypt-Encrypt with three
keys in ECB mode, and use the resulting ECB cipher in CBC
mode. One can also do 2-key triple DES, where the first and
last encryption keys are the same, the decryption key being
different. Note that if all three keys are the same, you
effectively get single encryption DES (at roughly one-third
the speed).
Ashar.
Follow-Ups: