- Generating 2048 Bit Rsa Keys Keys Will Be Non-exportable Today
- Generating 2048 Bit Rsa Keys Keys Will Be Non-exportable Free
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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. 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. Find answers to SSH breaks after changing hostname in Cisco IOS router. 1024 bit RSA keys, keys will be non-exportable.% Generating 1024 bit RSA keys. Working in Apple Swift for iOS. I have to generate this for the backend as it's a secure app. I'm new to security and certificates and have been searching for a day now with no results. How can I generate base64 url-encoded X.509 format 2048-bit RSA public key with swift? Any help is highly appreciated.
R1(config)#crypto key generate rsa usage-keys modulus 2048 The name for the keys will be: R1.rogerperkin.co.uk% The key modulus size is 2048 bits% Generating 2048 bit RSA keys, keys will be non-exportable. OK (elapsed time was 1 seconds)% Generating 2048 bit RSA keys, keys will be non-exportable.
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Introduction
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.
Prerequisites
Requirements
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.
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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.
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. 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. Restart CallManager and TFTP service on all nodes and CAPF service on Publisher.
Generating Your SSH Public Key Many Git servers authenticate using SSH public keys. In order to provide a public key, each user in your system must generate one if they don’t already have one. This process is similar across all operating systems. Generate RSA keys with SSH by using PuTTYgen. One effective way of securing SSH access to your cloud server is to use a public-private key pair. This means that a public key is placed on the server and a private key is placed on your local workstation. 
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.
Generating 2048 Bit Rsa Keys Keys Will Be Non-exportable Today
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.
Generating 2048 Bit Rsa Keys Keys Will Be Non-exportable Free
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.