This seems like a typo to me. There is no 128-bit DES.
There is 168-bit Triple-DES, though (uses 3 different
56-bit keys, i.e. 56 x 3 = 168.)
-----Original Message-----
From: Francois Orsini <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED] <[EMAIL PROTECTED]>
Date: Viernes 30 de Abril de 1999 21:33
Subject: Re: DES-128 bits ?
>Hi Paul,
>
>I had the same understanding as you and unfortunately the author of the
>article explicitely stated that DES-128 (112 bits) should be used instead of
>DES-64 (56 bits) as providing stronger encryption; and being faster than
>Triple-DES which has the drawback of being rather slow crypto cipher.
>
>That's why I was also surprised and has not heard of such DES-128, _not_
>being a Triple-DES-like crypto cipher...
>
>Thanks,
>
>--francois
>
>-----Original Message-----
>From: Paul Rubin <[EMAIL PROTECTED]>
>To: [EMAIL PROTECTED] <[EMAIL PROTECTED]>
>Date: Friday, April 30, 1999 3:28 PM
>Subject: Re: DES-128 bits ?
>
>
>>128 bit DES probably really means 112 bit triple DES. DES is supposed
>>to be implemented in hardware and from that point of view it has a 64
>>bit key. From a cryptography point of view, it has a 56 bit key,
>>since 8 of the 64 bits are parity bits and don't contribute any
>>entropy.
>>
>>There is a competition in progress to replace DES with a new Advanced
>>Encryption Standard (AES) with some candidates being evaluated now.
>>The AES will have a 128 bit block size and selectable key lengths of
>>128, 192, or 256 bits. However, the AES will not be finally selected
>>for another year or two.
>>
>>All the serious AES candidates are considerably faster in big-cpu
>>software than triple DES.
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>
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