triple des encryption

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2 total messages Started by alan gahtan Fri, 02 Oct 1992 04:00

#1219

Author: alan gahtan
Date: Fri, 02 Oct 1992 04:00

11 lines
794 bytes

Could someone please explain what is meant by "triple DES" encryption. 
Does it mean that the plaintext message is encrypted using the same 
password 3 times or does it mean the DES is used with three different 
passwords?

               Alan
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Re: triple des encryption

#1231

Author: Paul Schlyter
Date: Fri, 02 Oct 1992 09:47

18 lines
1175 bytes

In article <19921.4262.5798@dosgate> "alan gahtan" <alan.gahtan@canrem.com> writes:
>Could someone please explain what is meant by "triple DES" encryption. 
>Does it mean that the plaintext message is encrypted using the same 
>password 3 times or does it mean the DES is used with three different 
>passwords?

It means neither of them.  Only two DES keys are used, let's call them
A and B.  Triple DES encryption is performed like this: encrypt message
with A, decrypt with B, encrypt again with A.

If the two keys A and B are identical, then a triple DES encryption is
equivalent to a single DES encryption using either of the keys.

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Paul Schlyter, Swedish Amateur Astronomer's Society (SAAF)
Nybrogatan 75 A, 6 tr,  S-114 40 Stockholm,  Sweden
InterNet:  pausch@saaf.se

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