# All Questions

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### How can a Vigenère cipher be broken if the message is short?

I was watching a Stanford lecture on Vigenère cipher and in it the professor said that – to break the cipher – we assume the length of the key is known. We then break the cipher into groups of this ...
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### Random Number Generator based on AES CTR

I've just about done tinkering with an open source DRBG, and I sure would appreciate a bit of advice from this community. Here's the link to the project, hosted at codeproject.com. It is written in ...
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### Reference implementation of Threefish?

I am looking for a reference implementation (in C) of Threefish. Of course, I downloaded the Skein source code, but since this code is designed for a hash function (Skein), there is only some mentions ...
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### How is multiplication carried out in LWE based homomorphic encryption scheme?

I've been reading Brakerski and Vaikuntanathan's paper “Efficient Fully Homomorphic Encryption from (Standard) LWE”. I don’t understand how they are performing the “relinearization”. Can anyone ...
2k views

### Is calculating a hash code for a large file in parallel less secure than doing it sequentially?

I would like to improve the performance of hashing large files, say for example in the tens of gigabytes in size. Normally, you sequentially hash the bytes of the files using a hash function (say, ...