Authentication and Encryption Algorithms

IPsec uses two types of algorithms:

• Authentication

• Encryption

Authentication Algorithms

Authentication algorithms produce an integrity checksum value or digest based on the data and a key. The authentication algorithm man pages describe the size of both the digest and key (see, for example, authmd5h(7M) and authsha1(7M) man pages).

Encryption Algorithms

Encryption algorithms encrypt data with a key. Encryption algorithms operate on data in units of a block size. The encryption algorithm man pages describe the size of both the block size and the key size (see, for example, encrdes(7M) and encr3des(7M) man pages).