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Yes, this is exactly what KDFs and PRFs are designed for. That is, no reasonably efficient attacker will be able to tell if you used an actual random key or something generated from the KDF/PRF. This is of course assuming that your initial seed/master secret was of sufficient entropy, and the way you derive the various values are not done in a silly way. ...


A LCG - linear congruenz generator is used to generate a sequence of pseudorandomly numbers. Therefor it takes the previous output to calculate a new number: yi = (a*yi-1+c) mod N With a affine cipher in contrast you can encrypt and decrypt. You can convert your text to a number, for example character for character "A"->0 "B"->1... "Z"-> 25 To encrypt a ...

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