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This number is then used as a shared symmetric cryptographic key and can be used as a key-encryption key (KEK) or to generate a content-encryption key (CEK). The CEK is commonly known as a session key. To prevent the same key from being generated in subsequent communication sessions, a random value is incorporated into the initial KEK generation process. This ensures that the resulting KEK is unique for each communication session. In IPSec implementations, this uniqueness of keys from one key exchange to another is used to provide perfect forward secrecy.
Cryptographic Systems Cryptographic systems, or cryptosystems as they are commonly called, convert a plaintext message to a ciphertext message using a cryptographic key. The mechanism that applies the key to the message is called a cryptographic algorithm or a cipher. 3: ■■ Plaintext, also known as cleartext, is data in its original, readable format before being encrypted. ■■ Ciphertext is the encrypted output resulting from the application of a cryptographic method on plaintext. ■■ Cryptographic key is the password or other cryptographic mechanism used in the transformation of the plaintext to ciphertext.
As expected, nothing occurs. The browser indicates that the page cannot be displayed. Just to cover all areas, you decide to start from square one and walk through everything that needs to occur in order for you to access the Web site. The following is a walkthrough of the commands you performed in order to review the problem. 23 24 Chapter 2 • OSI Model and Then Some Step 1. You’re looking for the name orders. com to resolve to an IP address. 4 is the output of the nslookup command that you ran from the command prompt on your laptop.