scholarly journals Hierarchical Identity-based Broadcast Cryptography and its Application in Blockchain

2021 ◽  
Author(s):  
Chenchen Han
Keyword(s):  
Data Security ◽  
Hot Spots ◽  
Research Direction ◽  
Broadcast Encryption ◽  
Formal Definition ◽  
Database Technology ◽  
Identity Based ◽  
Identity Based Cryptography ◽  
Definition Of

Blockchain as an emerging cryptographic database technology has gained wide attention in many directions. Among them, data security is one of the hot spots of research in blockchain. In this paper, we first analyze the security problems of blockchain and then propose to solve them with hierarchical identity-based broadcast encryption (HIBBE). HIBBE, as a variant of hierarchical identity-based cryptography, can effectively improve the data security. HIBBE has all the characteristics of hierarchical identity-based cryptography, so it has potential in decentralized application scenarios. Then we made an overview of the several existing HIBBE scheme. This paper also gives a formal definition of HIBBE and concludes with the research direction of HIBBE-based blockchain.

scholarly journals Adaptive Secure Cross-Cloud Data Collaboration with Identity-Based Cryptography and Conditional Proxy Re-Encryption

2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Qinlong Huang ◽  
Yue He ◽  
Wei Yue ◽  
Yixian Yang
Keyword(s):  
Service Providers ◽  
Cloud Service ◽  
Security And Privacy ◽  
Broadcast Encryption ◽  
Cloud Data ◽  
Identity Based ◽  
Identity Based Cryptography ◽  
And Performance ◽  
Cryptographic Techniques ◽  
Data Collaboration

Data collaboration in cloud computing is more and more popular nowadays, and proxy deployment schemes are employed to realize cross-cloud data collaboration. However, data security and privacy are the most serious issues that would raise great concerns from users when they adopt cloud systems to handle data collaboration. Different cryptographic techniques are deployed in different cloud service providers, which makes cross-cloud data collaboration to be a deeper challenge. In this paper, we propose an adaptive secure cross-cloud data collaboration scheme with identity-based cryptography (IBC) and proxy re-encryption (PRE) techniques. We first present a secure cross-cloud data collaboration framework, which protects data confidentiality with IBC technique and transfers the collaborated data in an encrypted form by deploying a proxy close to the clouds. We then provide an adaptive conditional PRE protocol with the designed full identity-based broadcast conditional PRE algorithm, which can achieve flexible and conditional data re-encryption among ciphertexts encrypted in identity-based encryption manner and ciphertexts encrypted in identity-based broadcast encryption manner. The extensive analysis and experimental evaluations demonstrate the well security and performance of our scheme, which meets the secure data collaboration requirements in cross-cloud scenarios.

ISF: A Visual Formalism for Specifying Interconnection Styles for Software Design

1998 ◽  
Vol 08 (04) ◽  
pp. 517-540 ◽  
Author(s):  
Spiros Mancoridis
Keyword(s):  
Software Design ◽  
Deductive Database ◽  
Formal Definition ◽  
Simple Design ◽  
The Core ◽  
Custom Design ◽  
Database Technology ◽  
Definition Of ◽  
High Level ◽  
Visual Notation

We have developed a framework for specifying high-level software designs. The core of the framework is a very simple visual notation. This notation enables designers to document designs as labelled rectangles and directed edges. In addition to the notation, our framework features a supporting formalism, called ISF (Interconnection Style Formalism). This formalism enables designers to customize the simple design notation by specifying the type of entities, relations, legal configurations of entities and relations, as well as scoping rules of the custom notation. In this paper we present the formal definition of ISF and use ISF to specify two custom design notations. We also describe how ISF specifications, using deductive database technology, are used to generate supporting tools for these custom notations.

Secure Symmetric Key Fuzzy Identity-Based Encryption

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.

A secure anonymous proxy signcryption scheme

2017 ◽  
Vol 11 (2) ◽  
Author(s):  
Vishal Saraswat ◽  
Rajeev Anand Sahu ◽  
Amit K. Awasthi
Keyword(s):  
Discrete Logarithm ◽  
Formal Definition ◽  
Security Model ◽  
Diffie Hellman ◽  
Cryptographic Primitive ◽  
Primitive Identity ◽  
Identity Based ◽  
Efficiency Comparison ◽  
Definition Of ◽  
Signcryption Scheme

AbstractWe introduce a new cryptographic primitive identity-based anonymous proxy signcryption which provides anonymity to the proxy sender while also providing a mechanism to the original sender to expose the identity of the proxy sender in case of misuse. We introduce a formal definition of an identity-based anonymous proxy signcryption (IBAPS) scheme and give a security model for it. We also construct an IBAPS scheme and prove its security under the discrete logarithm assumption and computational Diffie–Hellman assumption. Moreover, we do an efficiency comparison with the existing identity-based signcryption schemes and anonymous signcryption schemes and show that our scheme is much more efficient than those schemes, we also compare the efficiency of our scheme with the available proxy signcryption schemes and show that our scheme provides anonymity to the proxy sender at cost less than those of existing proxy signcryption schemes.

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

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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