policy [<policy>]  | Specify the IKE encryption policy: •	des—The Data Encryption Standard. This is the default value. •	3des—Triple DES encryption algorithm. •	aes—The AES 128-bit encryption algorithm. •	aes256—The AES 256-bit encryption algorithm. •	null_enc—The null encryption algorithm. Internet Key Exchange (IKE) is the protocol that ensures a secure, authenticated communications channel between two peers.  |