August 2023
Intermediate to advanced
638 pages
13h 52m
English
Content preview from Advanced Data Communications and Networks
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H Encryption
H.1 Cracking the code
A cryptosystem converts plaintext into cipertext using a key. There are several methods that a hacker can use to crack a code, including:
- Known plaintext attack. Where the hacker knows part of the ciphertext and the corresponding plaintext. The known cipertext and plaintext can then be used to decrypt the rest of the cipertext.
- Chosen-cipertext. Where the hacker sends a message to the target, this is then encrypted by the target’s private-key and the hacker then analyses the encrypted message. For example, a hacker may send an email to the encryption file server and the hacker spies on the delivered message.
- Exhaustive search. Where the hacker uses brute force to decrypt the cipertext and tries every possible ...
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