# Definition:RSA 129/Historical Note

## Historical Note RSA $129$
RSA $129$ is one of a number of large ($100$ digits and over) semiprimes offered up as a factorisation challenge by Ronald Linn Rivest, Adi Shamir and Leonard Max Adleman as a demonstration of the effectiveness of their encryption algorithm now known as RSA.
In $1993$, a concerted effort was made by over $600$ academics and hobbyists, moderated over the Internet, to crack the code and so decipher the message which was hidden thereby.