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A public key is a very large number, mathematically derived from your private key. It is derived in such a way that the two numbers are linked, but so that the private key cannot be discovered by anyone who only knows the public key. The public key is what you send to other parties, to whom you want to authenticate yourself, or to whom you want to ...


I realize my mistake. Thanks @kasperd for helping me figure it out. I followed Azure's SSH creation instructions to the letter. When I generated my key, I used this command openssl req -x509 -key ~/.ssh/id_rsa -nodes -days 365 -newkey rsa:2048 -out myCert.pem which generates a new key that expires after 365 days. It just so happens that yesterday was that ...

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