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Re: Thoughts on 15 day CJ crypto
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[email protected] (Eric Hughes) writes:
> From: Hal <[email protected]>
> Also, are there restrictions on the encryption exponent? A 1024 bit RSA
> with a small encryption exponent would be faster to check than a 512 bit
> RSA with an arbitrary 512 bit encryption exponent.
>These are public key operations, remember. The public exponents are
>usually only a few bits long anyway, no matter what the modulus.
That's what I mean. "Usually" they are, but that helps a snooper to
check his guess. Maybe it would be wise when using limited-length
session keys to use larger encryption exponents just to confound an
exhaustive search of the session key space. I think it is surprising
if there is no limitation on encryption exponent size for these
exportable key systems, assuming that is the strategy the government is
using.
Hal
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