[rc5] key security question
ted99 at ibm.net
Fri Jun 6 13:49:38 EDT 1997
On 06/06/97 Henry W Miller <mill0440 at gold.tc.umn.edu> said:
>With XOR systems the key is not reused EVER. you print up two identical
>pads of paper with the key on it. You take one pad with you, and leave
>the other pad with your trusted friend. If someone steals you pad they
>can send fake messages form you only until the pad runs out. The beauty
OK, this way of encryption is 100% secure for the price of unconvenient
keys. A zip drive 'pad' will allow two people to send each other about 5K
medium-sized (20Kb) letters. Not too bad. It will make sense if you give it
to a spy (OK, just to your lover) before s/he goes for a mission (home).
But if you talk Internet... no way. Also, the key will eventually run out
(Well, we can have a Gbyte of true randomness ;).
/** Christ is risen ! *** __+__ ****** Fedor "Ted" Kouranov *****/
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