Key cryptography

Bài giảng "Mật mã học: Public-Key cryptography" cung cấp cho người học các kiến thức: Principles of asymmetric cryptography, one-way function, key lengths and security levels, euclidean algorithm,...Mời các bạn cùng tham khảo.

49p abcxyz123_10 07-06-2020 32 5   Download

Tài liệu "Cryptography: Module 18" trình bày các chủ đề: Giới thiệu cryptography; tổng quan về mã hóa; các thuật toán băm; public key infrastructure; chữ ký số, mã hóa dữ liệu; trên ổ cứng truecrypt. Mời các bạn tham khảo.

18p tranhanh9196 12-10-2018 46 5   Download

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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In this chapter, you will learn to: Differentiate between two categories of cryptography schemes; understand four aspects of security; understand the concept of digital signature; understand the role of key management in entity authentication; know how and where IPSec, TLS, and PPG provide security.

41p tangtuy09 26-04-2016 56 3   Download

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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Bài giảng "Chương 9: Mã khoá công khai và RSA" trình bày các nội dung về mã khóa riêng, khoá mã công khai Public Key Cryptography, lý do dùng mã khóa công khai, các đặc trưng của khoá công khai, ứng dụng khoá công khai, tính an toàn của các sơ đồ khoá công khai,...Mời bạn đọc cùng tham khảo.

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This technical report presents an efficient implementation of the com - monly used hash algorithm SHA - 1. The SHA - 1 algorithm is widely used in various public-key cryptography algorithms, and therefore efficient hard-ware implementation of SHA - 1 is of great importance.

14p dunglh2013 02-04-2014 75 1   Download

Bài báo đề xuất một số thuật toán mật mã khóa công khai được phát triển từ hệ mật ElGamal. Ưu điểm của các thuật toán mới đề xuất là cho phép bảo mật và xác thực thông tin một cách đồng thời. Hơn nữa, mức độ an toàn của các thuật toán mới đề xuất không nhỏ hơn mức độ an toàn của thuật toán ElGamal.

7p dunglh2013 30-03-2014 1235 1161   Download

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

26p muathu_102 28-01-2013 66 6   Download

Requirements - must be able to verify that: 1. Message came from apparent source or author, 2. Contents have not been altered, 3. Sometimes, it was sent at a certain time or sequence. Protection against active attack (falsification of data and transactions)

28p muathu_102 28-01-2013 46 5   Download

will consider authentication functions developed to support application-level authentication & digital signatures will consider Kerberos – a private-key authentication service then X.509 - a public-key directory authentication service

26p muathu_102 28-01-2013 62 5   Download

At cats' green on the Sunday he took the message from the inside of the pillar and added Peter Moran's name to the two names already printed there in the "Brontosaur" code. The message now read: “Leviathan to Dragon: Martin Hillman, Trevor Allan, Peter Moran: observe and tail.” What was the good of it John hardly knew. He felt better, he felt that at last he had made an attack on Peter Moran instead of waiting passively and effecting no retaliation. Besides, what was the use of being in possession of the key to the codes if he never took...

22p muathu_102 28-01-2013 63 5   Download

No Singhalese, whether man or woman, would venture out of the house without a bunch of keys in his hand, for without such a talisman he would fear that some devil might take advantage of his weak state to slip into his body. —The Golden Bough, Sir James George Frazer

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John wrote the letters of the alphabet under the letters in its first lines and tried it against the message. Immediately he knew that once more he had broken the code. It was extraordinary the feeling of triumph he had. He felt on top of the world. For not only had he done it, had he broken the July code, but he now had the key to every future coded message, since instructions as to the source of the next one must of necessity appear in the current one at the end of each month. —Talking to Strange Men, Ruth Rendell ...

23p muathu_102 28-01-2013 55 3   Download

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

23p muathu_102 28-01-2013 46 3   Download

To use data encryption algorithms in network communications, all parities must first agree on using the same secret keys Rely on couriers Set up a meeting to determine a secret key Use postal service, email service, phone service … However, these conventional methods are inflexible for network communication applications Public-key cryptography (PKC) Invented in the 1970’s Without the need of sharing prior secrets to distribute secret keys securely Can also be used for authentication

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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) ...

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

Tăng nhanh nhu cầu truyền tải linh hoạt và an toàn thông tin cần thiết để sử dụng các phương pháp mật mã mới. Nhược điểm chính của các mật mã học cổ điển là nhu cầu để gửi một khóa (long) thông qua một kênh an toàn siêu trước gửi tin nhắn tự. IV054 Trong mật mã học (symetric key) bí mật-key cả người gửi và người nhận chia sẻ cùng một bí mật quan trọng. Trong ryptography khoá công khai có hai khóa khác nhau: một khoá mật mã công cộng và một chìa khóa giải mã bí mật (ở phía bên nhận)....

29p hongmi 12-03-2011 127 9   Download

In cryptography, a man-in-the-middle attack (MITM) is an attack in which an attacker is able to read, insert and modify at will, messages between two parties without either party knowing that the link between them has been compromised. The attacker must be able to observe and intercept messages going between the two victims. The MITM attack can work against publickey cryptography and is also particularly applicable to the original Diffie- Hellman key exchange protocol, when used without authentication....

22p liemhang 23-01-2011 259 92   Download