Questions tagged [cryptography]

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Error in entropy properties in Mathematical Theory of Cryptography by Claude E. Shannon

I am reading this classic paper by Claude E. Shannon and I think there may be a couple of errors in his description of the properties of Entropy/Uncertainty. The screenshot shown at the bottom of this ...
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Living in Minicrypt, but sampling hard instances without the solution

In Impagliazzo's worlds, Minicrypt is the one, where one way functions exist. In other words, we can sample hard-on-average instances of NP complete problems. Question: Is living in Minicrypt, where ...
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Direct Diffie-Hellman by Shor's algorithm

Shor's algorithm appears to be capable of finding discrete logarithm even if the modulus is composite. Does the algorithm implicitly compute the Carmichael Lambda which goes in the exponent or somehow ...
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73 views

Chosen message attack on unhashed GGH signatures?

Background: I've been reading GGH's Public-Key Cryptosystems from Lattice Reduction Problems, and have a question about a remark the authors make: "It is important to remark at the outset, that ...
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139 views

Is there a notion of indistinguishability obfuscation for almost equivalent circuits?

In the definition of indistinguishability obfuscation (iO), we have a probabilistic algorithm Obs that receives as input a circuit C, such that $i)$ the output Obs(C) is a circuit with the same ...