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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Functional encryption ： ウィキペディア英語版 Functional encryption Functional encryption is a type of public-key encryption in which possessing a secret key allows one to learn a function of what the ciphertext is encrypting. More precisely, a functional encryption scheme for a given functionality $F$ consists of the following four algorithms: *$(pk,\; msk)\; \backslash leftarrow\; Setup(1^\backslash lambda)$: creates a public key $pk$ and a master secret key $msk$. *$sk\; \backslash leftarrow\; Keygen(msk,\; k)$: uses the master secret key to generate a new secret key $sk$ for value $k$. *$c\; \backslash leftarrow\; Enc(pk,\; x)$: uses the public key to encrypt a message $x$. *$F(k,\; x)\; \backslash leftarrow\; Dec(sk,\; c)$: uses secret key to calculate a function of the value $c$ encrypts. Functional encryption generalizes several existing primitives including Identity-based encryption (IBE) and Attribute-based encryption (ABE). In the IBE case, define $F(k,x)$ to be equal to $x$ when $k$ corresponds to an identity that is allowed to decrypt, and $\backslash perp$ otherwise. Similarly, in the ABE case, define $F(k,\; x)\; =\; x$ when $k$ encodes attributes with permission to decrypt and $\backslash perp$ otherwise. == Background == Functional encryption was proposed by Amit Sahai and Brent Waters in 2005 and formalized by Dan Boneh, Amit Sahai and Brent Waters in 2010. Until recently, however, most instantiations of Functional Encryption supported only limited function classes such as boolean formulae. In 2012, several researchers developed Functional Encryption schemes that support arbitrary functions. 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「Functional encryption」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.