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Contents

• Ikev2 Pre Shared Key Generator

Introduction

1. I am trying to understand why do we really use those pre-shared keys when creating a IPSec tunnel. From all the reading that I have done the DH group creates the keys that are used to do the actual data encryption, hope I am correct.
2. Cisco ASA IKEv1 and IKEv2 Support for IPSEC. IETF proposed an updated Internet Key Exchange (IKE) protocol, called IKEv2, which is used to simplify and improve the legacy IKE protocol (IKEv1). Ikev1 pre-shared-key xxxxxxx: MORE READING: Cisco ASA and DNSSEC-Probable Issue with Packet Size.
3. Configuring an IKE Policy for Preshared Keys, Example: Configuring an IKE Policy.
4. If the PSK (Pre-Shared Key) is too short, or too long, an alert will pop up saying the following: 'The secret must be at least six characters long, no more than 64 characters, and contain four different characters'.

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.

Configuring an IKE Policy for Preshared Keys, Example: Configuring an IKE Policy. The Nonce's are combined with the Pre-Shared-Key to create a Seed value for generating secret keys. The relative part of the IKE RFC is here: For pre-shared keys: SKEYID = prf(pre-shared-key, Nib Nrb) SKEYID is the Seed value that will later be used to generate additional secret keys. If you must use pre-shared key authentication, use a unique pre-shared key per remote peer/user. Use main mode rather than aggressive mode IKEv1 phase 1 negotiation.

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: Debian putty generate ssh key.

• 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.

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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:

Verify

There is currently no verification procedure available for this configuration.

Troubleshoot

There is currently no specific troubleshooting information available for this configuration.

Ikev2 Pre Shared Key Generator

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