翻訳と辞書 Words near each other ・ Crystal Castles II ・ Crystal Castles III ・ Crystal Cathedral ・ Crystal Cathedral organ ・ Crystal Cave ・ Cryptostegia ・ Cryptostegia grandiflora ・ Cryptostephanus ・ Cryptostomata ・ Cryptostroma ・ Cryptostylidinae ・ Cryptostylis ・ Cryptostylis erecta ・ Cryptostylis hunteriana ・ Cryptostylis subulata ・ Cryptosystem ・ Cryptotaenia ・ Cryptotaenia canadensis ・ Cryptotaenia elegans ・ Cryptotaenia japonica ・ Cryptotendipes ・ Cryptotermes ・ Cryptotermes brevis ・ Cryptothallus ・ Cryptothallus mirabilis ・ Cryptothecia ・ Cryptothecia rubrocincta ・ Cryptothele ・ Cryptothele (lichen) ・ Cryptothele (spider) Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Cryptosystem ： ウィキペディア英語版 Cryptosystem In cryptography cryptosystem refers to a suite of cryptographic algorithms needed to implement a particular security service, most commonly for achieving confidentiality (encryption). Typically, a cryptosystem consists of three algorithms: one for key generation, one for encryption, and one for decryption. The term ''cipher'' (sometimes ''cypher'') is often used to refer to a pair of algorithms, one for encryption and one for decryption. Therefore, the term "cryptosystem" is most often used when the key generation algorithm is important. For this reason, the term "cryptosystem" is commonly used to refer to public key techniques; however both "cipher" and "cryptosystem" are used for symmetric key techniques. == Formal definition == Mathematically, a cryptosystem or encryption scheme can be defined as a tuple $(\backslash mathcal,\backslash mathcal,\backslash mathcal,\backslash mathcal,\backslash mathcal)$ with the following properties. #$\backslash mathcal$ is a set called the "plaintext space". Its elements are called plaintexts. #$\backslash mathcal$ is a set called the "ciphertext space". Its elements are called ciphertexts. #$\backslash mathcal$ is a set called the "key space". Its elements are called keys. #$\backslash mathcal\; =\; \backslash$ is a set of functions $E\_k\; :\; \backslash mathcal\; \backslash rightarrow\; \backslash mathcal$. Its elements are called "encryption functions". #$\backslash mathcal\; =\; \backslash$ is a set of functions $D\_k\; :\; \backslash mathcal\; \backslash rightarrow\; \backslash mathcal$. Its elements are called "decryption functions". For each $e\; \backslash in\; \backslash mathcal$, there is $d\; \backslash in\; \backslash mathcal$ such that $D\_d(E\_e(p))\; =\; p$ for all $p\; \backslash in\; \backslash mathcal$. Note; typically this definition is modified in order to distinguish an encryption scheme as being either a symmetric-key or public-key type of cryptosystem. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Cryptosystem」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.