The Blum Blum Shub generator is a deterministic Pseudo-Random Bit Generator with security demonstrably reducible to that of integer factorization.

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Blum-Blum-Shub Cryptosystem

I am given $N$, which is Bob's encryption key. I was able to successfully factor $N$ into $N=p*q$. Alice encrypts a messages for bob and sends $a = [1,1,1,0,0,0,1,0,1,1,0,...]$ $b = 1545164156...$ ...