We have seen a low-end access router take as long as an hour to generate a key with a very large modulus for greater security. During this time, the router's CPU load was extremely high. So we urge caution when using this command. Do you really want to remove these keys? You can also generate special usage keys as follows: Router1 config crypto key generate rsa usage-keys The name for the keys will be: Router1.
Note that we have created a bit key in this example. In general, longer keys are more secure, but also require considerably more computing time to generate. SSH Communications Security Corporation, the original developer of the SSH protocol, currently recommends a key length of bits for most applications. However, it is important to remember that this is only the public key. There is also a corresponding private key that you cannot view on the router. The private key is what the router uses to encrypt things that it sends.
The public key can decrypt anything encrypted with the private key. Every device that this router shares encrypted information with will need a copy of the public key, but the private key is secret. As a side effect of this, the public key provides an excellent authentication system. If a remote device's public key successfully decrypts a message from that device, then you know that this message must have been encrypted with that device's private key.
And, consequently, if the private key is really private, the message must actually have been sent by that device. When you use these keys on routers, we highly recommend using the cut-and-paste feature on your terminal rather than trying to type all of this in manually.
A length of less than bits is normally not recommended. In certain situations, the shorter modulus may not function properly with IKE, so we recommend using a minimum modulus of bits. The largest private RSA key modulus is bits. Therefore, the largest RSA private key a router may generate or import is bits.
The recommended modulus for a CA is bits; the recommended modulus for a client is bits. Additional limitations may apply when RSA keys are generated by cryptographic hardware. Specifying a Storage Location for RSA Keys When you issue the crypto key generate rsa command with the storage devicename : keyword and argument, the RSA keys will be stored on the specified device. This location will supersede any crypto key storage command settings.
If your router has a USB token configured and available, the USB token can be used as cryptographic device in addition to a storage device. Using a USB token as a cryptographic device allows RSA operations such as key generation, signing, and authentication of credentials to be performed on the token.
The private key never leaves the USB token and is not exportable.
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