Xem 1-20 trên 35 kết quả Message authentication
  • Objectives of Chapter 11: To define message integrity; to define message authentication; to define criteria for a cryptographic hash function; to define the Random Oracle Model and its role in evaluating the security of cryptographic hash functions; to distinguish between an MDC and a MAC; to discuss some common MACs.

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  • 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)

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  • We have looked at confidentiality services, and also examined the information theoretic framework for security.

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  • Objectives of Chapter 14: To distinguish between message authentication and entity authentication; to define witnesses used for identification; to discuss some methods of entity authentication using a password; to introduce some challenge-response protocols for entity authentication; to introduce some zero-knowledge protocols for entity authentication; to define biometrics and distinguish between physiological and behavioral techniques.

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  • Cryptography & Network Security: Exercise 3 - Nguyen Cao Dat provides about Message Authentication, Authentication requirements, Authentication Functions, Message encryption, Message Authentication Code (MAC), Hash function - Birthday attack and something else.

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  • Lecture 15: Hashing for message authentication. The goals of this chapter are: What is a hash function? Different ways to use hashing for message authentication, the one-way and collision-resistance properties of secure hash functions, the birthday paradox and the birthday attack, structure of cryptographically secure hash functions,...

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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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  • MD5 [MD5] is a message digest algorithm that takes as input a message of arbitrary length and produces as output a 128-bit "fingerprint" or "message digest" of the input. The published attacks against MD5 show that it is not prudent to use MD5 when collision resistance is required. This document replaces the security considerations in RFC 1321 [MD5]. [HMAC] defined a mechanism for message authentication using cryptographic hash functions. Any message digest algorithm can be used, but the cryptographic strength of HMAC depends on the properties of the underlying hash function.

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  • Enterprise Java Bean là các thành phần công nghệ phía máy chủ dùng để đóng gói lớp logic nghiệp vụ (business logic) và hổ trợ mạnh việc thực hiện các giao tác và bảo mật. Enterprise Java Bean cũng có một tích hợp một ngăn xếp cho messaging, scheduling, remote access, web service endpoints (SOAP and REST), dependency injection, component life cycle,..vv.

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  • This chapter considers key establishment protocols and related cryptographic techniques which provide shared secrets between two or more parties, typically for subsequent use as symmetric keys for a variety of cryptographic purposes including encryption, message authentication, and entity authentication. The main focus is two-party key establishment, with the aid of a trusted third party in some cases.

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  • Ubiquitous learning and foreign language learning in listening Ubiquitous learning enables learners to learn in their daily life and helps them to overcome limitations of time and space. Learners who study a foreign language with mobile devices will be able to experience learning from an authentic situation and have their learning performance enhanced (Nash, 2007), as multiple sense stimuli may be more helpful to learners in absorbing knowledge. So far, ubiquitous learning has been implemented in many types ...

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  • Cryptographic hash functions play a fundamental role in modern cryptography. While related to conventional hash functions commonly used in non-cryptographic computer applications – in both cases, larger domains are mapped to smaller ranges – they differ in several important aspects. Our focus is restricted to cryptographic hash functions (hereafter, simply hash functions), and in particular to their use for data integrity and message authentication.

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  • Hash Function, Message Digest and Message Authentication Code Khi công nghệ chữ ký kỹ thuật số trở nên rộng rãi hơn hiểu và sử dụng, nhiều quốc gia trên toàn thế giới đang cạnh tranh phát triển các tiêu chuẩn chữ ký riêng của họ để sử dụng và các ứng dụng của họ. Một số ứng dụng điện tử sử dụng chữ ký số trong thương mại điện tử (thương mại điện tử) bao gồm e-mail và các giao dịch tài chính.

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  • The remote access server duplicates the hash and compares it to the hash in the MS-CHAP Response. If the hashes are the same, the remote access server sends back an MS-CHAP Success message. If the hashes are different, an MS-CHAP Failure message is sent.

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  • Encryption is a widely used technique which involves making information indecipherable to protect it from unauthorised viewing or use, especially during transmission or when it is held on removable magnetic media. Encryption is usually based on a key(s) without which the information cannot be decoded (decrypted). The most widely used encryption system is DES (Data Encryption Standard) although increasingly this is being replaced commercially by the more secure public key system RSA.

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  • Midterm Review Cryptography & Network Security - Nguyen Cao Dat Introduction (OSI Security Architecture, Security Attack, Security mechanism,...); Basics of Cryptography (Symmetric cipher, Public key cryptography, Message authentication, Digital signatures).

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  • Network Security: Chapter 4 - Message Authentication includes Message authentication (message encryption, MACs, hash functions); Security of Hash Functions and Macs, Hash-based Message Authentication Code(HMAC, Cipher-based Message Authentication Code(CMAC).

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  • Security in Information Systems: Chapter 4 - Cryptography & Key Exchange Protocols includes CryptographyCryptography -related conceptsrelated concepts, Key channel for symmetric cryptosystems, Perfect encryption, Dolev-Yao threat model, Protocol “message authentication”, Protocol “challenge-response”, Public-key cryptosystems.

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  • Cryptography & Key Exchange Protocols includes about Cryptography-related concepts, Key channel establishment for symmetric cryptosystems, Perfect encryption, Dolev-Yao threat model, Protocol “message authentication”Protocol “message authentication”, Protocol “challenge-response“, Public-key cryptosystems.

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  • Presence of the network makes a distributed system susceptible to security attacks such as tampering of messages and masquerading, which can be launched through interprocess messages. This chapter discusses authentication and message security measures used in distributed operating systems to thwart such attacks. Methods of verifying authenticity of data are also discussed.

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