Force frequent session key renegotiation

Description

The RekeyLimit parameter specifies how often the session key of the is renegotiated, both in terms of amount of data that may be transmitted and the time elapsed.
To decrease the default limits, add or correct the following line in /etc/ssh/sshd_config:

RekeyLimit  

Rationale

By decreasing the limit based on the amount of data and enabling time-based limit, effects of potential attacks against encryption keys are limited.