k fileĮxtracts certificate(s) and private key(s) from the specified PKCS #12 file. i keyĭisplays information about the specified key. You can use the key that is created to configure public key client authentication on an OpenSSH server. The converted key is created using the same base file name with an added. Uses the specified Reflection public key to generate a public key in OpenSSH format. hĭisplays a brief summary of command options. F keyĭisplays the fingerprint of the specified key in Bubble Babble format. This mode enforces key creation using FIPS-approved key strength. To change to a null passphrase, you can use this option in combination with -P. To edit the passphrase without opening an interactive session, you can use this option in combination with -p and -N. When you use this option alone you will be queried for the old and new passphrase for the specified private key. e private_keyĬhanges the passphrase of the specified private key. Uses the specified private key to derive a new copy of the public key. Don't store passphrases or other sensitive information in the comment. Note: The comment is displayed when a passphrase-protected key is used for client authentication. If you do not specify a comment, a default comment is created that includes the key type, creator, date, and time. Use quotation marks if the string includes spaces. Specifies information for the comment field within the key file. The values for ECDSA keys are 256, 384 and 521. The minimum and maximum values for RSA and DSA keys are 58 respectively. The default for RSA keys is 2048 bits, the default for DSA is 1024 and the default for ECDSA keys is 256. To ensure the best choice for your needs, we recommend that you contact your security officer. The length of key you should use depends on many factors, including: the key type, the lifetime of the key, the value of the data being protected, the resources available to a potential attacker, and the size of the symmetric key you use in conjunction with this asymmetric key. Increasing key size slows down the initial connection, but has no effect on the speed of encryption or decryption of the data stream after a successful connection has been made. Up to a point, a larger key size improves security. To view the descriptive equivalents, use the -h command line option.Įxtracts certificate(s) and CRL(s) from the specified PKCS#7 file. Options are available in both a single-character form (such as -b) and a descriptive equivalent ( -bits). pub extension (for example id_rsa_2048_myhost_a.pub ). Public keys are given the same base name as the private key, with an added. For each private key you create, ssh-keygen also generates a public key. If you specify a file name, keys are saved to the current working directory unless you include a fully qualified path name. If you don't specify a file name on the command line, keys are created in ~/.ssh2/ and given a default name that identifies the key type, size, and host name (for example /home/joe/.ssh2/id_rsa_2048_myhost_a). When no options are specified, ssh-keygen generates a 2048-bit RSA key pair and queries you for a passphrase to protect the private key. Use ssh-keygen to create RSA, DSA, ECDSA keys for public key authentication, to edit the properties of existing keys, and to convert key file formats for compatibility with other Secure Shell implementations.
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