SSH Key PASSPHRASE

A passphrase is similar to a password. However, a password generally refers to something used to authenticate or log into a system. A passphrase generally refers to a secret used to protect an encryption key. Commonly, an actual encryption key is derived from the passphrase and used to encrypt the protected resource.

Passphrases are commonly used for keys belonging to interactive users. Their use is strongly recommended to reduce risk of keys accidentally leaking from, e.g., backups or decommissioned disk drives.

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