Cisco Generate 1024 Bit Rsa Keys

Contents

Introduction

This document describes how to:

Jan 21, 2018 An RSA key pair (a public and a private key) is required before you can obtain a certificate for your router; that is, the end host must generate a pair of RSA keys and exchange the public key with the certification authority (CA) to obtain a certificate and enroll in a PKI.

Nov 29, 2017  The RSA key can also be generated by issuing the command: crypto key generate rsa general-keys modulus 1024 (or 2048) without enabling 'ip http secure-server'. So, you don't need to enable 'ip http secure-server' at all to use SSH, just generate the RSA key with the 'crypto key generate' command as mentioned above. Mar 30, 2020 Then configure the router to use RSA key pair with modulus size of 1024 bites for remote service authentication with “crypto key generate rsa ” command. Add username “Admin” with Password of “Technig” for ssh authentication. Enabled ssh with “line vty 0 4” command. Crypto key generate rsa exportable modulus 1024% The key modulus size is 1024 bits% Generating 1024 bit RSA keys, keys will be exportable.OK despues quiero enrolar. Crypto ca enroll CERTIFICADO. Pero al enrollar mi terminal genera una llave de 512 bits. Porque puede ser eso? Mi equipo es un cisco 1811 flash:c181x-advipservicesk9-mz. SSH Public Key Authentication on Cisco IOS. PKI (Public Key Authentication) is an authentication method that uses a key pair for authentication instead of a password. Putty itself can’t generate any RSA keys but we can do this with. Let’s generate a 2048 bit RSA key pair: R1(config).

  • create a certificate signing request (CSR) on the Secure Socket Layer Module (SSLM)

  • import the certificate using cut and paste in privacy-enhanced mail (PEM) format

Prerequisites

Before you begin, you need to know the domain name that is assigned to the certificate. You also need the Certificates Authorities (CA) root certificate, and possibly the CA intermediate certificate.

Requirements

Before attempting this configuration, ensure that you meet these requirements:

  • CA root certificate; possibly the intermediate root certificate

  • domain name for certificate

  • information

Components Used

The information in this document is based on these software and hardware versions:

  • release 2.1(2)

  • Verisign Test Certificate

Cisco Generate 1024 Bit Rsa Keys 1

The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If your network is live, make sure that you understand the potential impact of any command.

Conventions

For more information on document conventions, refer to the Cisco Technical Tips Conventions.

Main Task

Task

This section details each step needed to create the CSR, from the creation of the key pair to importing the server certificate.

Step-by-Step Instructions

Complete the instructions in this section.

  1. Create the key pair.

    nov10-key is the name of the key pair.

    Note: Be sure to specify exportable; otherwise, you are not able to export the key pair from the SSLM.

  2. Create the trustpoint .

    The name of the trustpoint is yoursite. You need to enter the subject name in X.509 format and your domain name. This information is used to create the CSR.

  3. Generate the CSR.

  4. Send the CSR to your CA.

    Use copy and paste to send the CSR to your CA. standard ahci 10 serial ata controller driver update windows 7 If your CA asks for a server type, select Apache.

  5. Load the CA root certificate

    Before you can load the server certificate, you must load any CA certificates. At a minimum, this is the CA root certificate, and possibly a CA intermediate certificate. Your CA is able to provide you with the necessary certificates.

  6. Load the server certificate.

Intermediate Certificates

If you have an intermediate certificate, you need to configure two trustpoints. One trustpoint contains the CA root certificate only. You only need to configure enrollment terminal PEM and Certificate Revocation List (CRL) optional. The second trustpoint contains the intermediate certificate and the server certificate. The second trustpoint is configured similar to the first trustpoint, however, instead of the root certificate, use the intermediate certificate.

Verify

There is currently no verification procedure available for this configuration.

Troubleshoot

This section provides troubleshooting information relevant to this configuration.

If you run into problems loading the certificates, enable debugging with the debug crypto pki transactions command.

Make sure you have the complete certificate chain. You can determine this by viewing the certificates on a PC. Save the certificates with a .cer extension, then double click to open them.

The root certificate is shown in Figure 1. You can determine this by looking at the Issued to and Issued by sections. Both sections are the same. Also, note that the certificate is showing up as not trusted because it a test certificate.

Figure 1

The server certificate is shown in Figure 2. You call determine that it matches the root certificate because the Issued by section matches the Issued by section on the root certificate.

Figure 2

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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

Generate 1024-bit Rsa Keys Cisco


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

Generate 1024 Bit Rsa Key

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.

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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.

Generate Rsa Crypto Key Cisco

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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