http://www.rfc-editor.org/rfc/rfc2313.txt
RFC 2313: PKCS #1: RSA Encryption Version 1.5, B. Kaliski1998-03-01T23:00:00-00:00This document describes a method for encrypting data using the RSA public-key cryptosystem. This memo provides information for the Internet community. It does not specify an Internet standard of any kind.