Basics of cryptography

Lecture "On safety and security of information systems: Cryptography" provide students with knowledge about: Basic terminology of cryptography; History of cryptography; Symmetric cipher;... Please refer to the detailed content of the lecture!

56p hoabingan205 12-12-2022 10 5   Download

Lecture Operating System: Chapter 09 - Security presented The security environment, Basics of cryptography, User authentication, Attacks from inside the system, Attacks from outside the system, Protection mechanisms, Trusted systems.

56p talata_1 22-09-2014 90 7   Download

Advanced Encryption Standard competition began in 1997 Rijndael was selected to be the new AES in 2001 AES basic structures: block cipher, but not Feistel cipher encryption and decryption are similar, but not symmetrical basic unit: byte, not bit block size: 16-bytes (128 bits) three different key lengths: 128, 192, 256 bits AES-128, AES-192, AES-256 each 16-byte block is represented as a 4 x 4 square matrix, called the state matrix the number of rounds depends on key lengths 4 simple operations on the state matrix every round (except the last round) ...

38p muathu_102 28-01-2013 73 3   Download

Các thuật ngữ cơ bản (Basic Terminology) + plaintext : thông điệp gốc (original message ) + Ciphertext : thông điệp mã hóa ( 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 + cryptography : study of encryption principles/methods + cryptanalysis (codebreaking) : the study of principles/ methods of deciphering ciphertext without knowing key + cryptology : lĩnh vực nghiên cứu của cả cryptogr...

45p d15tmt 01-04-2011 199 42   Download