ESXI-06-000010 - The VMM must use DoD-approved encryption to protect the confidentiality of remote access sessions.


Approved algorithms should impart some level of confidence in their implementation. These are also required for compliance.

Note: This does not imply FIPS 140-2 certification.


Limit the ciphers to those algorithms which are FIPS-approved. Counter (CTR) mode is also preferred over cipher-block chaining (CBC) mode.

Add or correct the following line in '/etc/ssh/sshd_config':

Ciphers aes128-ctr,aes192-ctr,aes256-ctr,aes128-cbc,aes192-cbc,aes256-cbc

Supportive Information

The following resource is also helpful.

This security hardening control applies to the following category of controls within NIST 800-53: Access Control.This control applies to the following type of system Unix.