The default number of optional submethods that must be passed is 0, although if no required submethods are specified, the client must always pass at least one optional submethod.
See the sshd2_config man pages for more information on the keywords (Appendix sshd2_config).
(Optional) You can configure password change for the password submethod with the two configuration variables described in Section User Authentication with Passwords.
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ISACA Practitioner Guide for SSH
With contributions from practitioners, specialists and SSH.COM experts, the ISACA “SSH: Practitioner Considerations” guide is vital best practice from the compliance and audit community. Download now