Hash Functions

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  • Objectives of Chapter 12: To introduce general ideas behind cryptographic hash functions; to discuss the Merkle-Damgard scheme as the basis for iterated hash functions; to distinguish between two categories of hash functions; to discuss the structure of SHA-512; to discuss the structure of Whirlpool.

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  • We propose a succinct randomized language model which employs a perfect hash function to encode fingerprints of n-grams and their associated probabilities, backoff weights, or other parameters. The scheme can represent any standard n-gram model and is easily combined with existing model reduction techniques such as entropy-pruning. We demonstrate the space-savings of the scheme via machine translation experiments within a distributed language modeling framework. h

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  • Security is a very important issue, which has attracted the interest of the research community the latest years, at a great factor. Hash functions belong to the category of encryption algorithms. In this work, a novel architecture and the VLSI implementation of HAVAL hash function is proposed.

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  • Linear Hashing allow a hash file to expand and shrink dynamically without needing a directory; Suppose the file starts with M buckets numbered 0,1,…,M -1 and used h(K) = K mod M. This hash function is called initial hash function hi.

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  • Principles of Database Management Systems - Notes 5: Hashing and More presents about Two alternatives, Example hash function, Within a bucket, Rule of thumb, overflow chains, Extensible hashing, Linear hashing.

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  • In computing, a hash table (also hash map) is a data structure used to implement an associative array, a structure that can map keys to values. A hash table uses a hash function to compute an index into an array of buckets or slots, from which the correct value can be found.

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  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Perceptual Audio Hashing Functions ¨ Hamza Ozer

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  • In this paper, we explore the power of randomized algorithm to address the challenge of working with very large amounts of data. We apply these algorithms to generate noun similarity lists from 70 million pages. We reduce the running time from quadratic to practically linear in the number of elements to be computed.

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  • The continued growth of both wired and wireless communications has triggered the revolution for the generation of new cryptographic algorithms. SHA-2 hash family is a new standard in the widely used hash functions category.

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  • Bài giảng Cơ sở dữ liệu giải thuật: Bài 9 - Bảng băm do giảng viên Hoàng Thị Điệp biên soạn cung cấp cho các bạn những kiến thức về phương pháp băm, các hàm băm - Hash function, các chiến lược giải quyết va chạm - Collision resolution.

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  • Data Structures and Algorithms: Maps and Dictionaries presents Maps & Dictionaries, The Map ADT, Dictionary ADT, Implement Dictionary ADT, Hash Tables, Hash Functions and Hash Tables, Hash Codes, Compression Functions.

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  • • Home address: address produced by a hash function. • Prime area: memory that contains all the home addresses. • Synonyms: a set of keys that hash to the same location. • Collision: the location of the data to be inserted is already occupied by the synonym data.

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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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  • Basic Concepts • Sequential search: O(n) • Binary search: O(log2n) Requiring several key comparisons before the target is found • Search complexity: Size 16 50 256 1,000 10,000 100,000 1,000,000 Binary 4 6 8 10 14 17 20 Sequential (Average) 8 25 128 500 5,000 50,000 500,000 Sequential (Worst Case) 16 50 256 1,000 10,000 100,000 1,000,000 • Is there a search algorithm whose complexity is O(1)? • Is there a search algorithm whose complexity is O(1)? YES.

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  • Authentication and message integrity are essential building blocks for protocols of many security related verification processes like data origin authentication for valid software updates or device authentication.

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  • Mật mã và bảo mật trong hệ thống viễn thông là một lĩnh vực có nhiều thuật ngữ có thể làm cho nhiều người "ngơ ngác": như "hash function", "one-time pad" hay Rijndael... Thread này nhằm giải thích các khái niệm thường dùng trong ngành mật mã học (cryptography) với hy vọng có thể giúp ích cho những ai mong muốn tìm hiểu về lĩnh vực này.

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  • Our magazine is more than just eighty printed pages enclosed in a colourful cover. Just take a look at our website, forum, online store, hakin9.live... All this just for you, our valued readers. Our primary goal is to help you expand your knowledge. And we are constantly trying to fi nd new ways to reach this goal. There is probably no need to mention that in both the current and future issues of the hakin9 magazine you will fi nd valuable articles showing you secrets of IT security. But there is more to it....

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  • This module explains to students how to strengthen the security of their Web applications by incorporating the programmatic use of cryptography. Depending on the programming platform, students will use one of several cryptographic libraries to add encryption, hashing, and digital signing functionality to their Web application. After completing this module, students will be able to use the CAPICOM cryptographic library and the System.Security.Cryptography namespace to encrypt, hash, and sign data....

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  • Bài báo đề xuất một dạng lược đồ chữ ký số mới được xây dựng trên cơ sở các bài toán phân tích một số nguyên lớn ra các thừa số nguyên tố, bài toán khai căn trong modulo hợp số. Từ dạng lược đồ mới đề xuất có thể phát triển thành một số lược đồ chữ k‎ số có khả năng ứng dụng được trong thực tế.

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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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