Set expiry date for ssh public keys

We did compliance activity and they given suggestion to regenerate pub key every 90 days and deploy on servers to authenticate. problem is every 90days i have to tell user to generate ssh key and send to me public key.
Is it possible to set ssh public key expiration for 90 Days in authorized_keys file , without touching anything on the Server? I am using Redhat 7.4.

You need to setup certificate authority and you can specify key to expire. You need to modify sshd server config to accept such certificate and more. This is discussed in a book called SSH mastery (https://www.cyberciti.biz/reviews/book-review-ssh-mastery/). I strongly suggest that you get that book and read it. Also read this page https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/6/html/deployment_guide/sec-using_openssh_certificate_authentication


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