Aes 256 Pre Shared Key Generator
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Contents
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Introduction
Cisco IOS® Software Release 12.3(2)T code introduces the functionality that allows the router to encrypt the ISAKMP pre-shared key in secure type 6 format in nonvolatile RAM (NVRAM). /windows-7-home-premium-license-key-generator.html. The pre-shared key to be encrypted can be configured either as standard, under an ISAKMP key ring, in aggressive mode, or as the group password under an EzVPN server or client setup. This sample configuration details how to set up encryption of both existing and new pre-shared keys.
Prerequisites
Requirements
There are no specific requirements for this document.
Components Used
The information in this document is based on this software version:
Cisco IOS Software Release 12.3(2)T
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
Refer to the Cisco Technical Tips Conventions for more information on document conventions.
Configure
This section presents you with the information you can use to configure the features this document describes.
Note: Use the Command Lookup Tool (registered customers only) to obtain more information on the commands used in this section.
These two new commands are introduced in order to enable pre-shared key encryption:
key config-key password-encryption [master key]
password encryption aes
The [master key] is the password/key used to encrypt all other keys in the router configuration with the use of an Advance Encryption Standard (AES) symmetric cipher. The master key is not stored in the router configuration and cannot be seen or obtained in any way while connected to the router.
Once configured, the master key is used to encrypt any existing or new keys in the router configuration. If the [master key] is not specified on the command line, the router prompts the user to enter the key and to re-enter it for verification. If a key already exists, the user is prompted to enter the old key first. Keys are not encrypted until you issue the password encryption aes command.
The master key can be changed (although this should not be necessary unless the key has become compromised in some way) by issuing the key config-key.. command again with the new [master-key]. Any existing encrypted keys in the router configuration are re-encrypted with the new key.
You can delete the master key when you issue the no key config-key... However, this renders all currently configured keys in the router configuration useless (a warning message displays that details this and confirms the master key deletion). Since the master key no longer exists, the type 6 passwords cannot be unencrypted and used by the router.
Note: For security reasons, neither the removal of the master key, nor the removal of the password encryption aes command unencrypts the passwords in the router configuration. Once passwords are encrypted, they are not unencrypted. Existing encrypted keys in the configuration are still able to be unencrypted provided the master key is not removed.
Additionally, in order to see debug-type messages of password encryption functions, use the password logging command in configuration mode.
Configurations
This document uses these configurations on the router:
| Encrypt the Existing Pre-shared Key |
|---|
| Add a New Master Key Interactively |
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| Modify the Existing Master Key Interactively |
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| Delete the Master Key |
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Verify
There is currently no verification procedure available for this configuration.
Troubleshoot
Pre Shared Key Generator
There is currently no specific troubleshooting information available for this configuration.
Related Information
PSK Generator provides a secure process to negotiate a 64-byte IPsec Pre-Shared Key (also known as a Shared Secret or PSK) through insecure means, such as email.
Note: This page uses client side javascript. It does not transmit any entered or calculated information.
Learn more about this PSK Generator.
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Instructions:
You and your VPN partner will use two separate passwords to create a unique 64-byte shared secret with the help of a cryptographic hash generator. Regardless of the length of each password, the generated Shared Secret will always be 64 bytes.
1) Create a list of at least 10 randomly generated passwords. These passwords should be at least 64 characters long. Email the password list to your VPN partner, but do NOT include these instructions, this website address, or anything else in the email that reveals the process that is about to be used.
Hint: Click on the keyhole of the padlock picture above to get a list of 32 cryptographically strong random passwords.
2) Over the phone, provide your VPN partner this website address and have them pick one of the passwords from the list you emailed to them. Both of you will copy and paste the selected password to the Password Seed box.
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3) Give your VPN partner a simple shorter password. I suggest a 16-digit numeric string as this would be easy to share over the phone with a reduced chance of mistakes. Both of you will enter this shorter passsword in the Key box.
4) Both of you will click the Generate button. Verify the first and last 2 or 3 bytes over the phone to ensure you've created the same Shared Secret.
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5) Copy and paste the Shared Secret to your VPN configuration.
Alternate Method: Both parties use a random password generator to create a list of 10 or more long passwords and email them to each other. On the phone, decide which password from one of the lists to use as the Password Seed and which password from the other list for the Key.