Zeroize Rsa After You Have Re-generated The Rsa Key

Posted : admin On 28.05.2020
  1. Zeroize Rsa After You Have Regenerated The Rsa Key In Word
  2. Zeroize Rsa After You Have Regenerated The Rsa Key In Windows 10
  • October 2, 2015
  • Posted by: Syed Shujaat
  • Category: Cisco, Networking Solutions

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.

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.

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.

3750xCoreStack(config)#cry key gen rsa% You already have RSA keys defined named 3750xCoreStack% Do you really want to replace them? yes/no: yes Choose the size of the key modulus in the range of 360 to 4096 for your General Purpose Keys. Choosing a key. Oct 24, 2006  (The password you enter here will need to be entered every time you use the RSA key but fortunately, you can set NO passphrase by pressing Enter. However, the upside is that you only have to. Jul 14, 2016  In the Cloud Administration Console, you can generate a certificate bundle that contains the private key, public certificate, and certificate signing request (CSR) that you need when configuring an identity provider (IdP) or a service provider (SP) in an SSO Agent deployment. For more information about certificates, see Cloud Authentication Service Certificates. As soon as you enter ip http secure-server you're good to go with https. For ssh you have to do crypto key generate rsa after clearing old rsa keys with the zeroize command but then you will l lose your ssh connection. But you don't need to reboot. 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! Nov 26, 2009 Re: How do I delete then create a new self signed Cert for sslvp As far as I remember, the self signed certificate that comes with the router will always be regenerated at every reboot, why don't you create a different trustpoint and make that a self singed certificate, creating the cert and then using it where you need it.

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

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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

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


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.

Zeroize Rsa After You Have Regenerated The Rsa Key In Word

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

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.

Zeroize Rsa After You Have Regenerated The Rsa Key In Windows 10