Generating and deleting an RSA key pair (2024)

To generate an RSA key pair, enter a command such as the following:

device(config)#crypto key generate rsa modulus 2048

To delete the RSA host key pair, enter the following command.

device(config)#crypto key zeroize rsa

Syntax: crypto key { generate | zeroize } rsa [ modulus modulus-size ]

The generate keyword places an RSA host key pair in the flash memory and enables SSH on the device, if it is not already enabled.

The optional [modulus modulus-size ] parameter specifies the modulus size of the RSA key pair, in bits. The valid values for modulus-size are 1024 or 2048. The default value is 1024.

The zeroize keyword deletes the RSA host key pair from the flash memory. This disables SSH if no other authentication keys exist on the device.

The rsa keyword specifies an RSA host key pair.

Generating and deleting an RSA key pair (2024)

FAQs

How to remove RSA key pair? ›

To delete the local key pair, run rsa local-key-pair destroy command. If the host key pair and the service key pair of an SSH server are deleted, run the rsa local-key-pair create command to create the new host key pair and service key pair for the SSH server.

How do I regenerate my RSA key? ›

If you use public key authentication

$ ssh-keygen Generating public/private rsa key pair. Enter file in which to save the key (/home/example/. ssh/id_rsa): Enter passphrase (empty for no passphrase): Enter same passphrase again: Your identification has been saved in /home/example/. ssh/id_rsa.

What is key pair in RSA? ›

An RSA key pair consists of a public key and a private key used in asymmetric cryptography. The keys are generated using prime numbers, and the security relies on the difficulty of factoring large composite numbers. The public key is used for encryption, while the private key is used for decryption.

How long does it take to generate RSA key? ›

It takes approximately 5 seconds to generate a 1024-bit-length RSA key pair, then encrypt and decrypt the random message. This time can vary for each execution.

How do I generate an RSA token? ›

In Online Banking for Business, click the Administration tab and under “Settings” select My Profile. At the bottom of the page, choose Create SecurID PIN. Then Select Set up RSA SecurID and follow the steps provided. If you've been assigned multiple tokens, you'll be prompted to choose the one you want to set up now.

How do I delete the RSA key? ›

To delete the local key pair, run rsa local-key-pair destroy command. If the host key pair and the service key pair of an SSH server are deleted, run the rsa local-key-pair create command to create the new host key pair and service key pair for the SSH server.

What happens if I delete an SSH key? ›

After your inactive SSH key is deleted, you must generate a new SSH key and associate it with your account. For more information, see "Generating a new SSH key and adding it to the ssh-agent" and "Adding a new SSH key to your GitHub account."

How do I remove a device from RSA? ›

In the Security Console, click Authentication > Risk-Based Authentication > Manage Enabled Users. Use the search fields to find the user whose device history that you want to delete. Click the user, and click Delete Device History. Click OK to confirm the deletion.

How do I delete RSA key container? ›

To delete the RSA key container, at the command prompt, run aspnet_regiis.exe with the -pz switch, followed by "MyKeys".

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