# All Questions

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### Reducing the probability that a password will be guessed

In a file users' password hashes are stored. There are 2 approaches to reduce the probability that the password is guessed. Increase the size of the salt from 12 bits to 24 bits. Increase the length ...
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### Non-repudiation in classical cryptosystem

How can we modify classical cryptography system to provide non-repudiation? I want to ensure non-repudiation in symmetric key cryptography so that we can find out who is sender of a particular ...
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### Can we use more than one irreducible polynomial in AES?

I understand that the irr. poly is used to form the s-box (and inv. s-box), the key schedule and the mix columns. But could we use a different irr. poly for the mix columns and another for the key ...
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### Are there any holes in my stateless encryption protocol?

I want to create a reasonably secure protocol to allow a bunch of machines within a datacenter to securely communicate to one another. Specifically as a kind of tunnel. I want to avoid building up ...
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### Secret construction

Given set of random strings $w =\{s_1, s_2, s_3 ... s_n\}$ are there any algorithms to construct single master secret $S$ from them? Subsequently we should be able to deconstruct the $S$ back to ...
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### Security Level Same or not in key extraction of identity-based encryption

In identity-based encryption, key generation is performed using ($s$) as a secret key for identity a as in (eq.1) $\bullet$ $Priv_{a}=s.H(ID_{a})$(eq.1) If key is generated as follows, $\bullet$ ...
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### Proper forward secrecy [closed]

Currently I have a protocol using a simple RSA to AES handshake. I have been reading more and more and would like to implement proper forward secrecy, but at the same time I'd like to improve the ...