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Introduction

1. Generating 2048 Bit Rsa Keys Keys Will Be Non-exportable On Youtube
2. Generating 2048 Bit Rsa Keys Keys Will Be Non-exportable Open
3. Generating 2048 Bit Rsa Keys Keys Will Be Non-exportable Chords
4. Generating 1024 Bit Rsa Keys Keys Will Be Non-exportable

This document describes the configuration example of Session Initiation Protocol (SIP) Transport Layer Security (TLS) and Secure Real-time Transport Protocol (SRTP) between Cisco Unified Communications Manager (CUCM), IP phone and Cisco Unified Border Element (CUBE) with the use of Enterprise Certificate Authority (CA) (Third Party CA) Signed certificates and to use common Enterprise CA to sign certificates for all network components which includes Cisco Communications devices like IP phones, CUCM, Gateways and CUBEs.

We recently took over a network switch for one of our properties that was managed by a vendor since it was riddled with security holes. The RSA key is 768 bit, if I wanted to make it 2048 or 4096 could I just run the crypto key generate rsa command and have it recreate the key? I am not on site. Nov 17, 2016 hello everyone. Today I will show you how to login Cisco router using ssh key. We will enable ssh on the router and then generate a key on an Ubuntu Linux server and using that key we will login to our router. The process is easy, lets start. Change the hostname of the router. Follow the below procedure to change the hostname of the router. Let’s generate a 2048 bit RSA key pair: R1(config)#crypto key generate rsa modulus 2048 The name for the keys will be: R1.NETWORKLESSONS.LOCAL% The key modulus size is 2048 bits% Generating 2048 bit RSA keys, keys will be non-exportable. OK (elapsed time was 24 seconds)%SSH-5-ENABLED: SSH 1.99 has been enabled. May 19, 2019 trainigrouter(config) #crypto key generate rsa The name for the keys will be: trainigrouter.training.local Choose the size of the key modulus in the range of360 to 4096 for your General Purpose Keys. Choosing a key modulus greater than 512 may take a few minutes. How many bits in the modulus 512: 2048. Jan 29, 2017  yes/no:% Generating 1024 bit RSA keys, keys will be non-exportable. OK (elapsed time was 1 seconds) Compressed configuration from 2653 bytes to 1370 bytesOKno Conditions: You will only run into this issue if your switch boots up with the factory default configuration and you go through the system configuration dialog. Sep 30, 2013  Rsa Encryption. posted in Programming: Hi guys!!! Im learning RSA Encryption now and for this reason Im programming a little sample in java in order to know how RSA works. But the problem here is that I cant know how programmers generate a Private Key or a Public Key(2048 bit Key) for making Encryption more secure.

Prerequisites

Requirements

Choosing a key modulus greater than 512 may take a few minutes. How many bits in the modulus 512: 2048% Generating 2048 bit RSA keys, keys will be non-exportable. OK (elapsed time was 16 seconds) R2(config)# R2(config)# HTH.

Cisco recommends that you have knowledge of these topics:

• Enterprise CA server is configured
• CUCM Cluster is configured in Mixed mode and IP Phones are registered in Secure Mode (Encrypted)
• CUBE basic voice service VoIP and dial-peer configuration is done

Components Used

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

• Windows 2008 server - certificate authority
• CUCM 10.5
• CUBE - 3925E with Cisco IOS® 15.3(3) M3
• CIPC

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.

Background Information

Secure voice communication over CUBE can be divided into two parts

• Secure Signaling - CUBE use TLS to secure signaling over SIP and Internet Protocol Security (IPSec) in order to secure signaling over H.323
• Secure Media - Secure Real-time Transport Protocol (SRTP)

CUCM Certificate Authority Proxy Function (CAPF) provides Locally Significant Certificate (LSC) to phones. So when CAPF is signed by external CA, it would act as subordinate CA for the phones.

In order to understand how to get CA-Signed CAPF, refer to:

Configure

Network Diagram

In this setup, Root CA and one Subordinate CA are used. All CUCM and CUBE certificates are signed by Subordinate CA.

Configure CUBE

Generate an RSA Keypair.

This step generates Private and Public Keys.

In this example, CUBE is just a Label, this can be anything.

2. Create a trustpoint for Subordinate CA and Root CA, Subordinate CA trustpoint is used for SIP TLS communication.

In this example, trustpoint name for subordinate CA is SUBCA1 and for Root CA it is ROOT.

Generating 2048 Bit Rsa Keys Keys Will Be Non-exportable On Youtube

Subject name used in this step must match on X.509 Subject Name on CUCM SIP Trunk security profile. Best practice is to use host-name with domain name (if domain name is enabled).

Associate RSA Key pair created in Step 1.

3. Generate CUBE Certificate Signing Request (CSR).

The crypto pki enroll command produces the CSR that is provided to the Enterprise CA in order to get the signed certificate.

Copy the output between BEGIN CERTIFICATE REQUEST to END CERTIFICATE REQUEST and save it in notepad file.

CUBE CSR would have these Key attributes:

4. Get CA certificate root CA, then CA certificate and Signed CUBE certificate from Subordinate CA.

In order to get Signed CUBE certificate, use CSR generated in Step 3. The image is from Microsoft CA web server.

5. Import CA certificate of Root CA and Subordinate CA.

Open Certificate in notepad and copy-and-paste content from BEGIN CERTIFICATE REQUEST to END CERTIFICATE REQUEST.

6. Import CUBE signed Certificate.

Open Certificate in notepad and copy-and-paste content from BEGIN CERTIFICATE REQUEST to END CERTIFICATE REQUEST.

7. Configure TCP TLS as transport protocol.

This can be done either at global or at dial-peer level.

8. Assign trustpoint for sip-ua, this trustpoint would be used for all sip signaling between CUBE and CUCM:

or, default trustpoint can be configured for all sip signaling from cube:

9. Locate key to generator room we happy few. Enable SRTP.

This can be done either at global or at dial-peer level.

10. For SRTP and Real-time Transport Protocol (RTP) internetworking, secure transcoder is required.

If Cisco IOS® version is 15.2.2T (CUBE 9.0) or later then, Local Transcoding Interface (LTI) transcoder can be configure to minimize the configuration.

LTI transcoder doesn't need Public Key Infrastructure (PKI) trustpoint configuration for SRTP-RTP calls.

If Cisco IOS® is below 15.2.2T, then configure SCCP transcoder.

SCCP transcoder would need trustpoint for signaling, however, if same router is used to host the transcoder then same trustpoint (SUBCA1) can be used for CUBE as well as transcoder.

Configure CUCM

1. Generate CallManager CSR on all CUCM nodes.

Navigate to CM OS Administration > Security > Certificate Management > Generate Certificate Signing Request as shown in the image.

CallManager CSR would have these Key attributes:

2. Get CallManager certificate for all CM nodes signed by subordinate CA.

Use CSR generated in Step 1. Any web-server certificate template would work, ensure that the Signed Certificate have atleast these Key Usage attributes: Digital Signature, Key Encipherment, Data Encipherment as shown in the image.

3. Upload CA certificate from Root CA and Subordinate CA as CallManager-Trust.

Navigate to CM OS Administration > Security > Certificate Management > Upload Certificate/Certificatechain as shown in the images.

4. Upload CallManager Signed certificate as CallManager as shown in the image.

5. Update Certificate Trust List (CTL) file on Publisher (through CLI).

6. Locate key in generator room. Restart CallManager and TFTP service on all nodes and CAPF service on Publisher.

7. Create New SIP Trunk Security Profile.

On CM Administration, navigate to System > Security > SIP Trunk Security Profiles > Find.

Copy existing Non Secure SIP Trunk Profile to create new secure profile as shown in this image.

8. Create SIP trunk to the CUBE.

Enable SRTP Allowed on SIP trunk as shown in the image.

Configure Destination port 5061 (TLS) and apply New Secure SIP trunk Security profile on the SIP trunk as shown in the image.

Verify

Use this section in order to confirm that your configuration works properly.

The output of show call active voice brief command is captured when LTI transcoder is used.

Also, when SRTP encrypted call is made between Cisco IP phone and CUBE or Gateway, a lock icon is displayed on the IP phone.

Troubleshoot

This section provides information you can use in order to troubleshoot your configuration.

These debugs would be helpful for troubleshooting PKI/TLS/SIP/SRTP issues.

• 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.)

Generating 2048 Bit Rsa Keys Keys Will Be Non-exportable Open

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

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.

Generating 2048 Bit Rsa Keys Keys Will Be Non-exportable Chords

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

Generating 1024 Bit Rsa Keys Keys Will Be Non-exportable