[rc5] RC64 keyspace

Ray Vanlandingham jamesrv at awod.com
Tue Oct 28 21:06:22 EST 1997


>No, you only have to decrypt two words at a time. In our case, the
wordsize is 32 bits, so
>we get 32*2 = 64 bits = 8 bytes back. If that matches "The unkn" then the
next 8 bytes are
>compared, and if they match, a potential success is logged.

So a particular key can decode 'The unkn', not decode the rest, and not
allow you to emiminate keys? Really odd...I guess I need to go buy that
'Applied Cryptography' book everyone keeps referring to. This is
interesting. :)


Ray Vanlandingham

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