May 2024
Intermediate to advanced
309 pages
13h 33m
English
Content preview from Data Communications and Computer Networks by Pearson
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282 Data Communications and Computer Networks
Substitution Cipher
This cipher replaces a symbol (a single letter or group of letters) of the plaintext with another symbol.
An example of substitution cipher is the Caesar cipher in which each alphabet of plaintext is replaced
by an alphabet obtained by shifting three letters from it. That is, A is replaced by D, B is replaced by E, Z
is replaced by C and so on. For example, cipher formed from the plaintext TACKLE will be WDFNOH.
A slight generalization of Caesar cipher is shift cipher in which the ciphertext alphabet can be obtained
by shifting n letters instead of 3; thus, n becomes the key ...
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