IPSEC VPN CHAPTER 5 TERMINOLOGY Part 3

Authentication

•IPSec VPN Peer verify each other using Authentication.
•Types –
•RSA Signature
•Pre-shared PSK

RSA Signature

•RSA Signature – Uses digital signature setup.
•Step 1- A creates Public and Private Key .
•Step 2 – A shares its Public with B
•Step 3- A uses a Data packet . Generates a Hash value of same and they encrypt it using Public key . This value is know as Digital Signature.
•Step 4-Digital Signature is send to B.
•Step 5 – B uses A’s Public key to decrypt the Digital Signature get the hash value .
•Hence verify that the data has came from A and not from else.

PSK

•Pre-shared Keys (PSK) – IPSec Peer needs to configured with same pre-shared key.
Here the peers must know each other .

Whereas in Digital Signature authentication is done between peers having no prior knowledge about each other.

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