(The initials of the authors) 1. RsA Data security, Inc. 2. Their cryptographysystems, especially RsA encryption. The RsA algorithm was first described in the paper: [R. Rivest, A. shamir, L. Adleman, "A Method for Obtaining Digital signatures and Public-key Cryptosystems". CACM 21,2 1978] (1995-03-21)