Revocable and Decentralized Attribute-Based Encryption
نویسندگان
چکیده
منابع مشابه
Revocable - Storage Decentralized Multi - Authority Functional Encryption
あらまし 近年,サーバへの不正アクセスが問題となっている.問題の解決にあたり属性ベース暗号が 提案されている.しかし属性ベース暗号は動的な属性変化に対応できない.そこで,ユーザ属性鍵の失効 機能を備えた方式が求められる.既存研究として,更新鍵が必要だが Encryptorに失効者情報を意識さ せずに済む Indirectな失効方式や,更新鍵は不要だが Encryptorが失効者情報を暗号文に規定しなくて はならない Directな失効方式が提案されている.一方,関数型暗号をベースとした代理人再暗号化によ る失効方式も提案されている.この方式は条件式の自由度は高いが,鍵発行機関が単一の方式のみ提案 されている.本研究では,Indirect/Directの性質を同時に実現したパッチによる失効機能を有する,複 数の鍵発行機関が存在可能な関数型暗号を提案する.また,Indirectの長所と引...
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Attribute-Based Encryption (ABE) is regarded as one of the most desirable cryptosystems realizing data security in the cloud storage systems. Functional Encryption (FE) which includes ABE and the ABE system with multiple authorities are studied actively today. However, ABE has the attribute revocation problem. In this paper, we propose a new revocation scheme using update information, i.e., rev...
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Cipher-policy attribute-based encryption (CP-ABE) is a more efficient and flexible encryption system as the encryptor can control the access structure when encrypting a message. In this paper, we propose a privacy-preserving decentralized CP-ABE (PPDCP-ABE) scheme where the central authority is not required, namely each authority can work independently without the cooperation to initialize the ...
متن کاملDecentralized Ciphertext-Policy Attribute-Based Encryption: A Post-Quantum Construction
In Ciphertext Policy Attribute-Based Encryption (CP-ABE) system, a set of attributes is associated with the private keys of each user. Also, the ciphertext is attached with a policy which is defined over that set of attributes. A user can decrypt the ciphertext if the ciphertext’s policy is satisfied by the attributes associated hith her private key. Traditional CP-ABE schemes, based on number ...
متن کاملIR-CP-ABE: Identity Revocable Ciphertext-Policy Attribute-Based Encryption for Flexible Secure Group-Based Communication
Ciphertext-Policy Attribute-Based Encryption (CP-ABE) is an access control mechanism over encrypted data and well suited for secure group-based communication. However, it also suffers from the following problem, i.e., it is impossible to build all desired groups. For example, if two group members have exactly the same attributes, how to construct a group including only one of the two members? O...
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ژورنال
عنوان ژورنال: The Computer Journal
سال: 2016
ISSN: 0010-4620,1460-2067
DOI: 10.1093/comjnl/bxw007