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XCCDF
Guide to the Secure Configuration of Ubuntu 20.04
Services
SSH Server
Configure OpenSSH Server if Necessary
Use Only Strong Key Exchange algorithms
Use Only Strong Key Exchange algorithms
An XCCDF Rule
Details
Profiles
Prose
Use Only Strong Key Exchange algorithms
Medium Severity
Limit the Key Exchange to strong algorithms. The following line in
/etc/ssh/sshd_config
demonstrates use of those:
KexAlgorithms