![]() ![]() The RSA Factoring Challenges ended in 2007. In 2001, RSA Laboratories expanded the factoring challenge and offered prizes ranging from $10,000 to $200,000 for factoring numbers from 576 bits up to 2048 bits. Many of the bigger numbers have still not been factored and are expected to remain unfactored for quite some time, however advances in quantum computers make this prediction uncertain due to Shor's algorithm. The smallest of them, a 100-decimal digit number called RSA-100 was factored by April 1, 1991. They published a list of semiprimes (numbers with exactly two prime factors) known as the RSA numbers, with a cash prize for the successful factorization of some of them. The RSA Factoring Challenge was a challenge put forward by RSA Laboratories on Ma to encourage research into computational number theory and the practical difficulty of factoring large integers and cracking RSA keys used in cryptography.
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