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Attribute-based encryption is a type of public-key encryption in which the secret key of a user and the ciphertext are dependent upon attributes (e.g. the country he lives, or the kind of subscription he has). In such a system, the decryption of a ciphertext is possible only if the set of attributes of the user key matches the attributes of the ciphertext.〔What is Attribute-Based Encryption, Cryptography Stack Exchange ''(Crypto SE )'' (2014)〕 A crucial security aspect of Attribute-Based Encryption is collusion-resistance: An adversary that holds multiple keys should only be able to access data if at least one individual key grants access. The concept of attribute-based encryption was first proposed in a landmark work by Amit Sahai and Brent Waters 〔Amit Sahai and Brent Waters, Fuzzy Identity-Based Encryption ''(Cryptology ePrint Archive, Report 2004/086 )'' (2004)〕 and later by Vipul Goyal, Omkant Pandey, Amit Sahai and Brent Waters.〔Vipul Goyal, Omkant Pandey, Amit Sahai and Brent Waters, Attribute-Based Encryption for Fine-Grained Access Control of Encrypted Data ''(ACM CCS (2006) )''〕 Recently, several researchers have further proposed Attribute-based encryption with multiple authorities who jointly generate users' private keys.〔Melissa Chase, Multi-authority Attribute-Based Encryption ''(TCC (2007) )''〕〔Melissa Chase and Sherman S.M. Chow, Improving privacy and security in multi-authority attribute-based encryption ''(ACM CCS (2009) )''〕〔Taeho Jung, Xiang-Yang Li, Zhiguo Wan, and Meng Wan, Privacy preserving cloud data access with multi-authorities ''(IEEE INFOCOM (2013) )''〕〔Taeho Jung, Xiang-Yang Li, Zhiguo Wan, and Meng Wan, Control Cloud Data Access Privilege and Anonymity With Fully Anonymous Attribute-Based Encryption ''(Transactions on Information Forensics and Security (2015) )''〕〔Allisso Lewko and Brent Waters, Decentralizing Attribute-Based Encryption ''(EUROCRYPT (2011) )''〕〔Sascha Muller, Stefan Katzenbeisser, and Claudia Eckert, On multi-authority ciphertext-policy attribute-based encryption ''(Bull. Korean Math. Soc. 46 (2009) )''〕 ==Usage== Attribute-based encryption (ABE) can be used for log encryption.〔Vipul Goyal, Omkant Pandey, Amit Sahai and Brent Waters, Attribute-Based Encryption for Fine-Grained Access Control of Encrypted Data ''(Cryptology ePrint Archive, Report 2006/309 )'' (2006)〕 Instead of encrypting each part of a log with the keys of all recipients, it is possible to encrypt the log only with attributes which match recipients' attributes. This primitive can also be used for broadcast encryption in order to decrease the number of keys used.〔David Lubicz and Thomas Sirvent, Attribute-Based Broadcast Encryption Scheme Made Efficient ''(First International Conference on Cryptology in Africa )'' (2008)〕 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「Attribute-based encryption」の詳細全文を読む スポンサード リンク
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