[Cryptography] Exotic Operations in Primitive Construction

Richard Outerbridge outer at interlog.com
Wed Sep 30 23:09:43 EDT 2020


> On 2020-09-30 (274), at 16:57:43, John Denker via cryptography <cryptography at metzdowd.com> wrote:
> 
> On 9/28/20 9:50 PM, Sid Spry wrote:
> 
>> bit rotation does not seem closely
>> related to any other easy to analyze operation. But I have no explanation for
>> why it feels this way.
>> 
>> Perhaps the only more irregular operation I can think of is a lookup.
> 
> Let's talk about DES in particular.  At the time it came along, it was
> common to implement crypto in SSI (small scale integration) hardware.

All wrapped up in an IBM bus & tag connected mainframe raised floor peripheral :)
__outer




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