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Contents
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). 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 |
|---|
| Modify the Existing Master Key Interactively |
|---|
| Delete the Master Key |
|---|
Verify
There is currently no verification procedure available for this configuration.
Troubleshoot
There is currently no specific troubleshooting information available for this configuration.
Related Information
- Java Cryptography Tutorial
- Message Digest and MAC
- Keys and Key Store
- Generating Keys
- Digital Signature
Secret Key Generator In Ios Download
- Cipher Text
- Java Cryptography Resources
- Selected Reading
Java provides KeyGenerator class this class is used to generate secret keys and objects of this class are reusable.
To generate keys using the KeyGenerator class follow the steps given below.
Step 1: Create a KeyGenerator object
The KeyGenerator class provides getInstance() method which accepts a String variable representing the required key-generating algorithm and returns a KeyGenerator object that generates secret keys.
Create KeyGenerator object using the getInstance() method as shown below.
App Icon Generator Ios
Step 2: Create SecureRandom object
The SecureRandom class of the java.Security package provides a strong random number generator which is used to generate random numbers in Java. Instantiate this class as shown below.
Step 3: Initialize the KeyGenerator
The KeyGenerator class provides a method named init() this method accepts the SecureRandom object and initializes the current KeyGenerator.
Initialize the KeyGenerator object created in the previous step using the init() method.
Example
Following example demonstrates the key generation of the secret key using the KeyGenerator class of the javax.crypto package.
Output
The above program generates the following output −