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3 votes

The security of using a digital signature scheme twice with randomness

The scheme is insecure; someone can, with two valid signatures, generate a valid signature to a different message. Suppose we have the signatures: $(r, \sigma_0, \sigma_1)$ a valid signature for the ...
poncho's user avatar
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1 vote

The security of using a digital signature scheme twice with randomness

This is a partial answer. The desired security goal (existential vs strong unforgeability or others?) hasn't been explicitly stated. Without restrictions, we can assume that (any) unforgeability is ...
Marc Ilunga's user avatar
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1 vote

Why cant you use randomness to seed more randomness?

Why cant you use randomness to seed more randomness? Obviously you can, that's what any (Cryptographically Secure) Pseudo Random Number Generator or (CS)PRNG does after all. Could the resulting hash ...
Maarten Bodewes's user avatar
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0 votes

Why cant you use randomness to seed more randomness?

I was looking into one-time-pads and am trying to figure out what would prevent you from generating an inf one-time-pad from a random seed. One time pads. Let me respond to a quote with another ...
Paul Uszak's user avatar
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