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Chapter 8: Scrambling Through Cryptography
Security+ Guide to Network Security Fundamentals
Second Edition
Objectives
• Define cryptography
• Secure with cryptography hashing algorithms
• Protect with symmetric encryption algorithms
• Harden with asymmetric encryption algorithms
• Explain how to use cryptography
Cryptography Terminology
• Cryptography: science of transforming information so it is secure while being transmitted or stored
• Steganography: attempts to hide existence of data
• Encryption: changing the original text to a secret message using cryptography
Cryptography Terminology (continued)
• Decryption: reverse process of encryption
• Algorithm: process of encrypting and decrypting information based on a mathematical procedure
• Key: value used by an algorithm to encrypt or decrypt a message
Cryptography Terminology (continued)
• Weak key: mathematical key that creates a detectable pattern or structure
• Plaintext: original unencrypted information (also known as clear text)
• Cipher: encryption or decryption algorithm tool used to create encrypted or decrypted text
• Ciphertext: data that has been encrypted by an encryption algorithm
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