Usage of randomness (i.e. non-predictable data, usually in the form of bits or numbers) for cryptographic purposes.

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2answers
2k views

How does the rand() function in C work? [closed]

I want to know how rand() works (even when I don't provide any seed how it produces PRNs?) thanks!
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2answers
120 views

How to best mix two arbitrary/random n-bit words? [closed]

Given two arbitrary/random $n$-bit words, how could one best mix them to get one $n$-bit word for general crypto usages? I suppose that one should have an adequate measure of goodness of the mix ...
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1answer
94 views

use the same pad reversed

Suppose I have a random number (eg 625 467 921). I use it once to encrypt a message OTP style, and when I want to use them again, I reverse them (eg to ...
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0answers
56 views

Need urgent help solving a riddle [on hold]

We got this riddle during a contest. This code requires 36 characters to be used: a->z AND 0->9. Can you solve it? hacgp6by68astytga5azagndca8jopc Need help solving it.