Non-PK encryption not vulnerable via low key length?!

[entropy () IntNet net (Jonathan Cooper)]

> Correct me if I am wrong - RC2 and RC4 are not public key cyrptosystems,
> and hence are not "prone" to the problems with low moduli.

   You are wrong.

   If the key is only 128-bit, that's a much smaller keyspace to 
brute-force attack than a 1024-bit key.

   (do the math)

-jon

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