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Blum Blum Shub

June 10, 2022 - Reading time: 5 minutes

Blum Blum Shub is a PRNG algorithm published in 1986.

Formula


The algorithm is very short and simple. Starting from the seed, the next state can be computed by passing the current state through the following formula.

f(x) = x² mod M

In this formula, M is the product of p and q, two large primes.

The complexity in this algorithm is hidden in the parameters; the seed and the modulus M. In order to have a long cycle length and fulfill its security promises, Blum Blum Shub has a few constraints on its parameters.

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Wikis

Cryptography

May 2, 2022 - Reading time: 2 minutes

What are Cryptology, Crpytography, Cryptoanalysis


The short answer:

Cryptology is a science which is interested by secure communication on an insecure communication channel.

Today, all communications passes over unsecured channels like letters, wired and wireless channels which sending data over. So, anyone able to interrupt or listen the message who is in same channel.

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