Crypto Key Generate Rsa Modulus 1024 Not Working Packet Tracer

Crypto Key Generate Rsa Modulus 1024 Not Working Packet Tracer 2
Crypto Key Generate Rsa Modulus 1024 Packet Tracer

Crypto key generate rsa. cryptokeygeneratersa,page2 Cisco IOS Security Command Reference: Commands A to C, Cisco IOS XE Release 3SE (Catalyst 3850 Switches). Why can't run crypto key generate rsa The 3548 was end of sales in July 2002 ( reference ). They do not support ssh (only telnet for vty access) and thus do not have the capability to generate an RSA key. Crypto key generate rsa. cryptokeygeneratersa,page2 Cisco IOS Security Command Reference: Commands A to C, Cisco IOS XE Release 3SE (Catalyst 3850 Switches). As of Cisco IOS Release 12.4(11)T, peer public RSA key modulus values up to 4096 bits are automatically supported. The largest private RSA key modulus is 4096 bits. Therefore, the largest RSA private key a router may generate or import is 4096 bits. However, RFC 2409 restricts the private key size to 2048 bits or less for RSA encryption. Router(config)#crypto key generate rsa modulus 1024% Please define a hostname other than Router. Router(config)#crypto key generate rsa modulus 1024 label CISCO The name for the keys will be: CISCO% The key modulus size is 1024 bits% Generating 1024 bit.

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.

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

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

!!! 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.”

And so you can make the final decision knowing how the operating system works perfectly. Install Windows 10 With Generic Microsoft KeysIf you are one of the users who want to do that of these generic keys to be able to test Windows 10 on your computer, then we leave you with a list with the essentials that Microsoft has made available to users. Generate product key for as3 word. There is a different key depending on the version of the operating system that you want to install temporarily.

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.

Router	360 bits	512 bits	1024 bits	2048 bits (maximum)
Cisco 2500	11 seconds	20 seconds	4 minutes, 38 seconds	More than 1 hour
Cisco 4700	Less than 1 second	1 second	4 seconds	50 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

Crypto Key Generate Rsa Modulus 1024 Not Working Packet Tracer

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.