[cryptography] A question about public keys

Michael Rogers michael at briarproject.org
Sun Sep 29 12:27:39 EDT 2013


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Sorry for making so much noise on the list today. I have a quick
question about public keys.

The Curve25519 paper says that "every 32-byte string is accepted as a
Curve25519 public key". Yet Elligator doesn't use Curve25519. So I
guess there must be a way to distinguish a bunch of Curve25519 public
keys from a bunch of random 32-byte strings. What is it?

Cheers,
Michael
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