IPSec and used keys

Hello world.

When you use ipsec (AH / ESP), authentication and encryption requires a secret key as dicussed in the following snippet:

Authentication allows you to calculate a value (ICV) integrity checking on the contents of the package, and it is usually based on a cryptographic like MD5 or SHA-1 hash. It incorporates a secret key known to both ends and this allows the recipient value ICV in the same way. If the beneficiary Gets the same value, the sender has actually authenticated itself (relying on the property that the cryptographic hashes cannot practically be reversed). AH still provides authentication and ESP to do eventually.
The encryption uses a secret key to encrypt data before transmission, and this mask the actual content of the package of eavesdroppers. There is a certain choice of algorithms here, with DES, 3DES, Blowfish and AES are quite common. Others are also possible.

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These keys can be configured manually, or they can be exchanged by IKE as dicussed in the following snippet:

From the manuals key IKE

Since both sides of the conversation need to know the secret values used in hash or encryption, there is the question of just how these data are exchanged. The manual keys require manual entry of the secret values at both ends, probably transmitted by an out-of-band mechanism, and IKE (Internet Key Exchange) is a sophisticated mechanism to do this online.

========================================================

When I look at the giiven examples in response to my last thread on the vpn, I don't see these sectet required for authentication keys and encrption pf packages. ;

Here is an example:

crypto ISAKMP policy 10

preshared authentication

address key crypto isakmp 199.199.199.2 CISCO

!

Crypto ipsec transform-set esp-3des esp-sha-hmac MyTransSet

transport mode

!

Profile of crypto ipsec MyProfile

game of transformation-MyTransSet

!

interface Tunnel0

IP 10.10.10.1 255.255.255.252

tunnel source 199.199.199.1

tunnel destination 199.199.199.2

ipv4 ipsec tunnel mode

Profile of tunnel MyProfile ipsec protection

!

interface serial0

199.199.199.1 IP address 255.255.255.0

automatic duplex

automatic speed

!

IP route 0.0.0.0 0.0.0.0 199.199.199.2

Above that the keys are used for authentication and encrption of packages?

Thanks and a great weekend.

As written in your quote, Ike negotiates these keys for you. Since you are using Ike, you don't have to manually configure the encryption keys in a block.

Sent by Cisco Support technique iPad App

Tags: Cisco Network

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