Computer Security Chapter Two

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Presentation transcript:

Computer Security Chapter Two Dr. Saad Abdulazize

Cryptography is the science of using mathematics to encrypt and decrypt data. Cryptography enables you to store sensitive information or transmit it across insecure networks (like the Internet) so that it cannot be read by anyone except the intended recipient

What is Cryptography? The art of secret writing The art of protection using information The science of encrypting or hiding secrets Needed for confidentiality

Basic Terminology plaintext - the original message ciphertext - the coded message cipher - algorithm for transforming plaintext to ciphertext key - info used in cipher known only to sender/receiver encipher (encrypt) - converting plaintext to ciphertext decipher (decrypt) - recovering ciphertext from plaintext

Basic Terminology cryptography - study of encryption principles/methods cryptanalysis (codebreaking) - the study of principles/ methods of deciphering ciphertext without knowing key cryptology - the field of both cryptography and cryptanalysis

Cryptography Can characterize according to type of encryption operations used substitution / transposition / product number of keys used single-key or private / two-key or public way in which plaintext is processed block / stream

Integer Factorization cryptology CRYPTOLOGY CRYPTOGRAPHY CRYPTANALYSIS Private Key (Secret Key) Public Key Block Cipher Stream Cipher Integer Factorization Discrete Logarithm

Encryption / Decryption Algorithm

Encryption

Dectyption