[rc5] Some Deep questions

Fedor Kouranov ted99 at ibm.net
Mon Aug 18 01:57:17 EDT 1997


On 08/17/97 "Brian Foddy" <bkfoddy at skypoint.com> said:

>Suppose I use the same algorithm to encrypt a message twice
>with two different keys.  It would not surprise me if
>this double encryption could be solved by a third unique
>key; like the third side of a triangle will get you to 
>the same point.  Is this true?

This misfeature of encryption is called a group. AFAIK, RC5 is not a group,
but I'm not sure. Anyway, you can encrypt a message with RC5-128 which will
give you adequate security (if you trust RC5).


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