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.

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.

Related Information

• Downloads - Catalyst 6500/6000 Module Software (registered customers only)

• 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

Generate 1024-bit Rsa Keys Cisco

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.

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.

Cisco Generate 1024 Bit Rsa Keys For Windows

Syntax Description : Optional Strings to embed with SSH Crypto key

Generate Rsa Crypto Key Cisco

Cisco Generate 1024 Bit Rsa Keys Free