Zeroize Rsa After You Have Re-generated The Rsa Key

Posted on  by
  • October 2, 2015
  • Posted by: Syed Shujaat
  • Category: Cisco, Networking Solutions
  1. Zeroize Rsa After You Have Regenerated The Rsa Key In Florida
  2. Zeroize Rsa After You Have Regenerated The Rsa Key Fob
  3. Zeroize Rsa After You Have Regenerated The Rsa Keyboard
  1. I have already deleted and regenerated my RSA key. Fortunately, I still have console access. HQ72062(config)#crypto key zeroize HQ72062(config)#crypto key zeroize rsa% All RSA keys will be removed.% All router certs issued using these keys will also be removed. Do you really want to remove these keys?
  2. I know you have to have a hostname configured to generate a key on the box, so it's obviously using the hostname at some level in the key. Whenever I change a hostname I've experienced the same result, but regenerating the key always fixes the problem.

Use this command to generate RSA key pairs for your Cisco device (such as a router). keys are generated in pairs–one public RSA key and one private RSA key.

Q&A for information security professionals. If you set up a pseudo-random number generator in two different locations, but with the same seed, and you assume that they are both on the same number of ticks from startup, will they output the same. Dec 12, 2019  Hi all, Currently we have some issue with ssh connection to some switch, i think rsa keys could be problem. I want to do crypto key zeroize command, but I'm afraid it will also delete crypto pki self signed part: crypto pki trustpoint SLA-TrustPoint enrollment pkcs12 revocation-check crl! Oct 16, 2019  After you have successfully generated an RSA key pair, you can proceed to any of the additional tasks in this module to generate additional RSA key pairs, perform export and import of RSA key pairs, or configure additional security parameters for the RSA key pair (such as encrypting or locking the private key).

If your router already has RSA keys when you issue this command, you will be warned and prompted to replace the existing keys with new keys.

NOTE: Before issuing this command, ensure that your router has a hostname and IP domain name configured (with the hostname and ipdomain-name commands).

The JWT is signed using an Administration API key. You can add up to 10 keys using the Cloud Administration Console. The keys do not expire. You must manually delete API keys from the Cloud Administration Console when they become compromised or are not in use. You can regenerate a key if it is lost or compromised. Sep 19, 2016  Deleted the keys again with 'crypto key zeroize rsa' 'show crypto key mypub rsa' revealed all keys had been deleted Regenerated keys with 'crypto key generate rsa general-keys modulus 2048' Logged in with SecureCRT and was prompted to accept the new key. Problem solved. Never run across a need to specify rsa in the zeroize command before.

You will be unable to complete the cryptokeygeneratersacommand without a hostname and IP domain name. (This situation is not true when you generate only a named key pair.)

Here are the steps to Enable SSH and Crypto Key setup : 2 config must requried for SSH

1 Setup Local VTY line User ID and password

Zeroize Rsa After You Have Regenerated The Rsa Key In Florida

router (Config) # Line VTY 0 15

router (Config-line)# login local

router (Config-line)# Exit

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!!! create local login ID/Pass

router (Config)# username [loginid] password [cisco]

router (Config)# username loginid1 password cisco1

2. router (Config)# ip domain-name example.com

router (Config)# crypto key generate rsa

how many bits in the modulus [512] :1024

router (Config)# ip ssh version2

router (Config)# CTRL Z

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Note

Secure Shell (SSH) may generate an additional RSA key pair if you generate a key pair on a router having no RSA keys. The additional key pair is used only by SSH and will have a name such as {router_FQDN }.server.

For example, if a router name is “router1.cisco.com,” the key name is “router1.cisco.com.server.”

This command is not saved in the router configuration; however, the RSA keys generated by this command are saved in the private configuration in NVRAM (which is never displayed to the user or backed up to another device) the next time the configuration is written to NVRAM.

Modulus Length

When you generate RSA keys, you will be prompted to enter a modulus length. The longer the modulus, the stronger the security. However, a longer modules take longer to generate (see the table below for sample times) and takes longer to use.

The size of Key Modulus range from 360 to 2048. Choosing modulus greater than 512 will take longer time.

Router360 bits512 bits1024 bits2048 bits (maximum)
Cisco 250011 seconds20 seconds4 minutes, 38 secondsMore than 1 hour
Cisco 4700Less than 1 second1 second4 seconds50 seconds

Cisco IOS software does not support a modulus greater than 4096 bits. A length of less than 512 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 2048 bits.

Syntax Description : Optional Strings to embed with SSH Crypto key

Zeroize Rsa After You Have Regenerated The Rsa Key Fob

general-keys(Optional) Specifies that a general-purpose key pair will be generated, which is the default.
usage-keys(Optional) Specifies that two RSA special-usage key pairs, one encryption pair and one signature pair, will be generated.
signature(Optional) Specifies that the RSA public key generated will be a signature special usage key.
encryption(Optional) Specifies that the RSA public key generated will be an encryption special usage key.
labelkey-label(Optional) Specifies the name that is used for an RSA key pair when they are being exported.If a key label is not specified, the fully qualified domain name (FQDN) of the router is used.
exportable(Optional) Specifies that the RSA key pair can be exported to another Cisco device, such as a router.
modulusmodulus-size(Optional) Specifies the IP size of the key modulus.By default, the modulus of a certification authority (CA) key is 1024 bits. The recommended modulus for a CA key is 2048 bits. The range of a CA key modulus is from 350 to 4096 bits.
Note Effective with Cisco IOS XE Release 2.4 and Cisco IOS Release 15.1(1)T, the maximum key size was expanded to 4096 bits for private key operations. The maximum for private key operations prior to these releases was 2048 bits.
storagedevicename:(Optional) Specifies the key storage location. The name of the storage device is followed by a colon (:).
redundancy(Optional) Specifies that the key should be synchronized to the standby CA.
ondevicename:(Optional) Specifies that the RSA key pair will be created on the specified device, including a Universal Serial Bus (USB) token, local disk, or NVRAM. The name of the device is followed by a colon (:).Keys created on a USB token must be 2048 bits or less.
CommandDescription
copyCopies any file from a source to a destination, use the copy command in privileged EXEC mode.
cryptokeystorageSets the default storage location for RSA key pairs.
debugcryptoengineDisplays debug messages about crypto engines.
hostnameSpecifies or modifies the hostname for the network server.
ipdomain-nameDefines a default domain name to complete unqualified hostnames (names without a dotted-decimal domain name).
showcryptokeymypubkeyrsaDisplays the RSA public keys of your router.
show crypto pki certificatesDisplays information about your PKI certificate, certification authority, and any registration authority certificates.

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