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A passphrase is a sequence of words or other text used to control access to a computer system, program or data. It is similar to a password in usage, but a passphrase is generally longer for added security.
ssh-keygen is a standard component of the Secure Shell (SSH) protocol suite found on Unix, Unix-like and Microsoft Windows computer systems used to establish secure shell sessions between remote computers over insecure networks, through the use of various cryptographic techniques. The ssh-keygen utility is used to generate, manage, and convert ...
In 2006, after being discussed in a working group named "secsh", [17] a revised version of the SSH protocol, SSH-2 was adopted as a standard. [18] This version offers improved security and new features, but is not compatible with SSH-1.
Secure Shell (SSH) is a protocol allowing secure remote login to a computer on a network using public-key cryptography.SSH client programs (such as ssh from OpenSSH) typically run for the duration of a remote login session and are configured to look for the user's private key in a file in the user's home directory (e.g., .ssh/id_rsa).
A passphrase is similar to a password in usage, but the former is generally longer for added security. [5] ... Access controls based on public-key cryptography e.g. ssh.
ssh-add and ssh-agent, utilities to ease authentication by holding keys ready and avoid the need to enter passphrases every time they are used. ssh-keygen, a tool to inspect and generate the RSA, DSA and elliptic-curve keys that are used for user and host authentication. ssh-keyscan, which scans a list of hosts and collects their public keys.
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To avoid theft, the SSH private key (something that one has) may be encrypted using a passphrase (something that one knows). To initiate a two-factor authentication process, the claimant supplies the passphrase to the client system. Like a password, the SSH passphrase is a memorized secret but that is where the similarity ends.