Semantic Definition of Anonymity in Identity-Based Encryption and Its Relation to Indistinguishability-Based Definition

On the Anonymity of Identity-Based Encryption

Journal of Applied Mathematics ◽

10.1155/2013/217480 ◽

2013 ◽

Vol 2013 ◽

pp. 1-9

Author(s):

Song Luo ◽

Ning Hu

Keyword(s):

Current Definition ◽

Identity Based Encryption ◽

Different Types ◽

Identity Based ◽

Definition Of

Anonymity of identity-based encryption (IBE) means that given a ciphertext, one cannot distinguish the target identity from a random identity. In this paper, we thoroughly discuss the anonymity of IBE systems. We found that the current definition of anonymity is obscure to describe some IBE systems, such as Gentry IBE system. Furthermore, current definition cannot express the degree of anonymity. So we divide the degree of anonymity into weak anonymity and strong anonymity based on indistinguishability between different games. For weakly anonymous IBE systems, the target identity in a ciphertext cannot be distinguished from a random identity. For strongly anonymous IBE systems, the whole ciphertext cannot be distinguished from a random tuple. We also discuss the type of anonymity and divide it into two types. Type 1 means that a random tuple can be seen as a valid ciphertext, while type 2 cannot. Based on our new definitions, we show that three famous IBE systems, Gentry IBE system, Boyen-Waters IBE system, and Lewko IBE system, have strong but different types of anonymity.

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Secure Symmetric Key Fuzzy Identity-Based Encryption

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.321-324.2665 ◽

2013 ◽

Vol 321-324 ◽

pp. 2665-2668

Author(s):

Peng Tao Liu

Keyword(s):

Security Requirements ◽

Public Key ◽

Formal Definition ◽

Secret Key ◽

The Public ◽

Identity Based Encryption ◽

Identity Based ◽

Symmetric Key ◽

Definition Of ◽

Fuzzy Identity

Symmetric key fuzzy Identity-Based Encryption (IBE) is a special type of IBE in secret key model. In this paper we extend the notion to the case of fuzzy Identity-Based Encryption, and give a formal definition of symmetric key fuzzy IBE and its security requirements. Moreover, we propose a construction of symmetric key fuzzy IBE based on the public key fuzzy IBE of Sahai and Waters, and prove its security.

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Hierarchical Certificate-Based Encryption: Definition and an Efficient Construction

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.513-517.1971 ◽

2014 ◽

Vol 513-517 ◽

pp. 1971-1974 ◽

Cited By ~ 1

Author(s):

Hai Lin Xu ◽

Yang Lu

Keyword(s):

Random Oracle Model ◽

Random Oracle ◽

Public Key ◽

New Paradigm ◽

Public Key Cryptosystems ◽

Identity Based Encryption ◽

Diffie Hellman ◽

Efficient Construction ◽

Identity Based ◽

Definition Of

Certificate-based encryption is a new paradigm which was introduced by Gentry to address the complex public key revocation problem in traditional public key cryptosystems. It represents an interesting and potentially useful balance between traditional public-key encryption and identity-based encryption. In this paper, we introduce the notion of hierarchical certificate-based encryption that preserves the advantages of certificate-based encryption such as implicit certificate and key-escrow free while inheriting the properties of hierarchical identity-based encryption. We formalize the definition of hierarchical certificate-based encryption and also propose a concrete hierarchical certificate-based encryption scheme that is chosen-ciphertext secure under the hardness of bilinear Diffie-Hellman problem in the random oracle model.

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Anonymous Hierarchical Identity-Based Encryption with Short Ciphertexts

IEICE Transactions on Fundamentals of Electronics Communications and Computer Sciences ◽

10.1587/transfun.e94.a.45 ◽

2011 ◽

Vol E94-A (1) ◽

pp. 45-56 ◽

Cited By ~ 6

Author(s):

Jae Hong SEO ◽

Tetsutaro KOBAYASHI ◽

Miyako OHKUBO ◽

Koutarou SUZUKI

Keyword(s):

Identity Based Encryption ◽

Identity Based

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¿Quién soy yo? Reflexiones teórico sistémicas acerca de la indentidad individual

Theorein. Revista de Ciencias Sociales. ◽

10.26807/theorein.v1i1.1 ◽

2017 ◽

Vol 1 (1) ◽

pp. 15-31

Author(s):

Francisco Xavier Morales

Keyword(s):

Identity Construction ◽

Social Systems ◽

Social Contexts ◽

Individual Identity ◽

Contemporary Society ◽

Self Identity ◽

Moral Communication ◽

Identity Based ◽

Definition Of ◽

The Individual

The problem of identity is an issue of contemporary society that is not only expressed in daily life concerns but also in discourses of politics and social movements. Nevertheless, the I and the needs of self-fulfillment usually are taken for granted. This paper offers thoughts regarding individual identity based on Niklas Luhmann’s systems theory. From this perspective, identity is not observed as a thing or as a subject, but rather as a “selfillusion” of a system of consciousness, which differentiates itself from the world, event after event, in a contingent way. As concerns the definition of contents of self-identity, the structures of social systems define who is a person, how he or she should act, and how much esteem he or she should receive. These structures are adopted by consciousness as its own identity structures; however, some social contexts are more relevant for self-identity construction than others. Moral communication increases the probability that structure appropriation takes place, since the emotional element of identity is linked to the esteem/misesteem received by the individual from the interactions in which he or she participates.

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