Cryptography. Cryptography is the science and art of transforming messages to make them secure and immune to attacks. It involves plaintext, encryption algorithm, ciphertext and decryption algorithm. Two types of cryptography exist: Symmetric-key cryptography and Public-key cryptography.
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Figure 29.1Cryptography components
Figure 29.2Encryption and decryption
Figure 29.3Symmetric-key cryptography
Figure 29.4Caesar cipher
Figure 29.5Example of monoalphabetic substitution
Figure 29.6Vigenere cipher
Figure 29.7Transpositional cipher
Figure 29.8Block cipher
Figure 29.11Product block
Figure 29.13General scheme of DES
Figure 29.14Iteration block
Figure 29.20Public-key cryptography
where P is the plain text value
where C is the ciphertext value