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### Blum Blum Shub

### Formula

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### Cryptography

#### What are Cryptology, Crpytography, Cryptoanalysis

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Wikis

June 10, 2022 - Reading time: 5 minutes

Blum Blum Shub is a PRNG algorithm published in 1986.

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.

Wikis

May 2, 2022 - Reading time: 2 minutes

**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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