For practical data sharing applications, many attributebased encryption (ABE) schemes were proposed with different kinds of properties, such as supporting large universe, revocation, verification and so on. However, existing schemes seldom support these three important properties simultaneously. In this paper, we present a directly revocable and verifiable key-policy ABE scheme for large univer...

A ciphertext-policy attribute-based encryption scheme allows that an encrypter assigns a decryption policy to ciphertexts. Any user will be able to decrypt if and only if a set of attributes (his private key) satisfy the assigned decryption policy. In this paper we first propose a new chosen ciphertext secure ciphertext-policy attribute-based encryption scheme with constant-size ciphertext and ...

We introduce a broad lattice manipulation technique for expressive cryptography, and use it to realize functional encryption for access structures from post-quantum hardness assumptions. Speci cally, we build an e cient key-policy attribute-based encryption scheme, and prove its security in the selective sense from learning-with-errors intractability in the standard model. This is a longer vers...

Ciphertext Policy Attribute Based Encryption (CP ABE) is a public key primitive in which a user is only able to decrypt a ciphertext if the attributes associated with secret key and the access policy connected with ciphertext matches. CP-ABE provides both confidentiality and access control to the data stored in public cloud. Anonymous CP-ABE is an adaptation of ABE where in addition to data con...

We present an Attribute Based Encryption system where access policies are expressed as polynomial size arithmetic circuits. We prove security against arbitrary collusions of users based on the learning with errors problem on integer lattices. The system has two additional useful properties: first, it naturally handles arithmetic circuits with arbitrary fan-in (and fan-out) gates. Second, secret...

Anonymous access control is a very desirable property in various applications e.g. encrypted storage in distributed environments; and attribute based encryption (ABE) is a cryptographic scheme that is targeted to achieve this property. ABE is an encryption mechanism that is useful in settings where the list of users may not be known apriori, but all users may possess certain credentials which c...

Attribute-based Encryption (ABE) allows for implementing fine-grained decentralized access control based on properties or attributes a user has. Thus, there is no need for writing detailed, user-based policies in advance. This makes ABE in particular interesting for implementing security mechanisms in dynamic environments such as ubiquitous computing, disaster management, or health-care. For su...

Bilinear groups are often used to create Attribute-Based Encryption (ABE) algorithms. In particular, they have been used to create an ABE system with multi authorities, but limited to the ciphertext-policy instance. Here, for the first time, we propose two multi-authority key-policy ABE systems. In our first proposal, the authorities may be set up in any moment and without any coordination. A p...

In this work, we aim to make attribute-based encryption (ABE) more suitable for access control to data stored in the cloud. For this purpose, we concentrate on giving to the encryptor full control over the access rights, providing feasible key management even in case of multiple independent authorities, and enabling viable user revocation, which is essential in practice. Our main result is an e...

In this paper, we describe a new broadcast encryption scheme for stateless receivers. The main difference between our scheme and the classical ones derived from the complete subtree paradigm is that the group of privileged users is described by attributes. Actually, some real applications have been described where the use of a more adaptable access structure brings more efficiency and ease of d...