Questions tagged [cryptography]

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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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62 views

RSA as an Hidden Subgroup Problem

the Hidden Subset Problem (HSP) covers several known problems (e.g. Integer Factorization Problem, Discrete Logarithm Problem) as a special case: Definition [Hidden Subgroup Problem (HSP)] Let $\...
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Must the cryptographic test for quantumness in [BCMVV18] use post-quantum Trapdoor Claw-Free Functions?

Brakerski, Christiano, Mahadev, Vazirani, and Vidick propose a scheme for verifiable computational quantumness based on a strengthening of trap-door claw-free functions (TCFs). In the above scheme: ...
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26 views

Encrypt an explicit circuit

Suppose we are given a circuit that are promised to be in a fixed class $\mathcal{C}$ (say AC^0). We want to “encapsulate” the circuit such that the resulting circuit computes the same function, while ...
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Examples of inverse of trapdoor functions non-learnable with black-box query access?

The (informal) definition of trapdoor function is a one-way function with a trapdoor $t$ such that given $f$, it is easy to compute $f(x)$ for any $x$, but hard to compute $f^{-1}(y)$ efficiently ...
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132 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 ...