What is IPsec? Definition Deep Dive.
These nonces generate new shared secret key material. If the lifetime for IPsec expires, it can renegotiate a new SA. Here the data is safely and securely transmitted through the IPsec tunnel. The sent packets are encrypted and decrypted using the specified encryption in the IPsec SAs.
An Illustrated Guide to IPsec.
A Cryptographic Evaluation of IPsec, by Bruce Schneier and Niels Ferguson. An interesting paper on the security of IPsec, whose main point is that IPsec is far too complex to ever really be secure something which has crossed our minds as well.
What is IPsec? Definition from Techopedia.
What is IPsec Internet Protocol Security?
The IPsec SAs set up earlier are used to encrypt and decrypt the packets. Finally, the IPsec tunnel is terminated. Usually, this happens after a previously specified number of bytes have passed through the IPsec tunnel or the session times out.