RSA, or Rivest-Shamir-Adleman, is a commonly used cryptographic algorithm for secure communication over the internet. However, there are several synonyms that are used in place of RSA depending on the context. For example, cryptography experts often use the term public-key cryptography, which refers to the method of encryption and decryption that RSA is based on. Another synonym that is used for RSA is asymmetric cryptography, since the key pair consists of a public key that is shared with others and a private key that is kept secret. Additionally, RSA is often referred to as PKI (Public Key Infrastructure), since it forms the basis for secure communication in many digital certificates.