Symmetric ciphers

The paper presents the results of an analysis of the decrease in cryptographic strength of the most common symmetric ciphers, taking into account the development of cryptanalytic methods. The vector of the threat to the reduction of information confidentiality stored and processed in information systems in the long term has been determined.

7p viyoko 01-10-2024 4 1   Download

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 "On safety and security of information systems: Symmetric ciphers" provide students with knowledge about: Block cipher principles; Data encryption standard; Feistel cipher;... Please refer to the detailed content of the lecture!

41p hoabingan205 12-12-2022 12 5   Download

Lecture "On safety and security of information systems: Symmetric ciphers advanced encryption standard" provide students with knowledge about: AES Origins; AES Structure; AES Key Expansion; An AES Example;... Please refer to the detailed content of the lecture!

38p hoabingan205 12-12-2022 16 5   Download

Bài giảng An toàn hệ thống thông tin: Chương 2a Mã hóa đối xứng cung cấp cho người học những kiến thức như: Mã cổ điển (Classical Encryption); Mã dòng (Stream Ciphers) và Mã khối (Block Ciphers); Mã DES (Data Encryption Standard); Mã hiện đại AES (Advanced Encryption Standard); Các mô hình ứng dụng mã khối. Mời các bạn cùng tham khảo!

34p caphesuadathemchanh 25-10-2021 63 3   Download

Bài giảng "Cryptography" cung cấp cho người đọc các kiến thức: Overview, symmetric ciphers, asymmetric ciphersciphers, cryptographic data integrity algorithms, mutual trust. Mời các bạn cùng tham khảo nội dung chi tiết.

223p doinhugiobay_15 25-02-2016 49 2   Download

Objectives of Chapter 3: To define the terms and the concepts of symmetric key ciphers; to emphasize the two categories of traditional ciphers: substitution and transposition ciphers; to describe the categories of cryptanalysis used to break the symmetric ciphers.

12p levuphongqn 18-08-2015 96 4   Download

Block ciphers are among the most widely used types of cryptographic algorithms provide secrecy and/or authentication services in particular will introduce DES (Data Encryption Standard)

40p muathu_102 28-01-2013 62 5   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

Figure 3.1 shows the general idea behind a symmetric-key cipher. The original message from Alice to Bob is called plaintext; the message that is sent through the channel is called the ciphertext. To create the ciphertext from the plaintext, Alice uses an encryption algorithm and a shared secret key. To create the plaintext from ciphertext, Bob uses a decryption algorithm and the same secret key.

67p timsach_info 06-05-2011 102 19   Download