October 2002
Beginner
506 pages
16h 24m
English
Content preview from Mastering™ Network Security, Second Edition
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8.3. Encryption 101
Cryptography is a set of techniques used to transform information into an alternate format that can later be reversed. This alternate format is referred to as the ciphertext and is typically created using a crypto algorithm and a crypto key. The crypto algorithm is simply a mathematical formula that is applied to the information you want to encrypt. The crypto key is an additional variable injected into the algorithm to ensure that the ciphertext is not derived using the same computational operation every time the algorithm processes information.
Let's say the number 42 is extremely important to you and you want to guard this value from peering eyes. You create the following crypto algorithm to encrypt this data:
data / crypto ...
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