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THE CRYPTOGRAPHY GUIDE: RSA. RSA RSA is a public key algorithm invented by Rivest, Shamir and Adleman. The key used for encryption is different from (but related to) the key used for decryption.The algorithm is based on modular exponentiation.hen talking of key lengths in connection with RSA, what is meant is the modulus length. An algorithm that uses different keys for encryption and decryption is said to be asymmetric. Anybody knowing the public key can use it to create encrypted messages, but only the owner of the secret key can decrypt them.
The authenticator is typically a hardware token (such as a USB token, smart card or key fob) and the software token is the RSA Authentication Manager Software that provides the security engine used to verify authentication requests.SA Secure ID Vulnerabilities. RSA secureID, which is considered to be the strongest authentication system on the market, was the target of a network breach in March 2011.