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Bill Stewart wrote:
The probability of a generating a key with KeyID of 0 is 2**-64.
It could happen by accident, though it probably won't, and worst case is
the lucky user of such a key will just have to check all messages
sent to him that have KeyID 0 against all his keys.
Annoying, but no loss of functionality.
Is it so hard for a key generator to guarantee that it never produces
a 64 bit key of ID 0? Generate another, or massage the original key in
a random way.
If you amortise the cost over all decryptions to be performed with that
key, it probably turns out to be cheaper.
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