Encryption ( ESP protocol only ) | Specify one of the following: 3des (default)—applies
Triple Data Encryption Algorithm (3DES) using three cryptographic
keys of 56 bits. aes-128-cbc —applies the Advanced Encryption
Standard (AES) using cryptographic keys of 128 bits. aes-192-cbc —applies the Advanced Encryption
Standard (AES) using cryptographic keys of 192 bits. aes-256-cbc —applies the Advanced Encryption
Standard (AES) using cryptographic keys of 256 bits. null —No encryption is used.
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