Symmetric key cryptography

Chapter 10 - Public key infrastructure. After completing this chapter, students will be able to: Explain cryptography strengths and vulnerabilities, define public key infrastructure (PKI), manage digital certificates, explore key management.

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Objectives of Chapter 7: To distinguish between two cryptosystems; to introduce trapdoor one-way functions and their use in asymmetric-key cryptosystems; to introduce the knapsack cryptosystem as one of the first ideas in asymmetric-key cryptography; to discuss the RSA cryptosystem.

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Classified along three independent dimensions: The type of operations used for transforming plaintext to ciphertext The number of keys used symmetric (single key) asymmetric (two-keys, or public-key encryption) The way in which the plaintext is processed

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traditional private/secret/single key cryptography uses one key Key is shared by both sender and receiver if the key is disclosed communications are compromised also known as symmetric, both parties are equal hence does not protect sender from receiver forging a message & claiming is sent by sender

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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) ...

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Bảo mật - Mã hóa dữ liệu Nội dung trình bày : • Symmetric Key Cryptography – SKC ( Phương pháp Mã hóa Đối xứng ) • Public Key Infrastructure – PKI ( Phương pháp Mã hóa Công Khai )

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