The term “proxy multi-signature” refers to the situation in which a proxy signer is authorized to sign a message on behalf of a group of original signers. Combined with identity-based cryptography, we proposed an efficient identity-based proxy multi-signature scheme using cubic residues without bilinear pairing. Our scheme is secure against existential forgery on adaptive chosenmessage and iden...

Verification of claimed identity becomes a problem of growing significance nowadays, as the number of e-commerce transactions grows rapidly and new information distribution channels are created by companies and institutions of all kinds. As most of them rely or make a use of a public network, such as the Internet, security of transferred data and information in most cases requires authorization...

This paper proposes an identity-based encryption (IBE) scheme based on traditional public-key cryptographic systems, such as RSA, DSA, Elgamal, etc. This scheme has a number of advantages over other systems. It can rely upon these traditional systems for its security. Since it uses these traditional encryption schemes, it is interoperable with and easily embedded within an existing security sys...

This thesis examines the application of identity-based cryptography (IBC) in designing security infrastructures for grid applications. In this thesis, we propose a fully identity-based key infrastructure for grid (IKIG). Our proposal exploits some interesting properties of hierarchical identity-based cryptography (HIBC) to replicate security services provided by the grid security infrastructure...

An identity-based encryption (IBE) scheme can greatly reduce the complexity of sending encrypted messages over the Internet. However, an IBE scheme necessarily requires a private-key generator (PKG), which can create private keys for clients, and so can passively eavesdrop on all encrypted communications. Although a distributed PKG has been suggested as a way to mitigate this problem for Boneh ...

In spite of the vital role played by Digital Certificates in Public Key Cryptographic systems, the overhead involved in maintaining those made them prohibitory. Certificateless Public Key Cryptography [1] was proposed as an alternative. It was based on based on the concept of implicit certification. Even though Certificateless Public Key Cryptography (CLPKC) combines the appealing features of P...

Most of the existing mailing systems provide limited authentication mechanisms, including web trust model, password authentication or identity based cryptography. Few existing mailing systems found in the literature provide strong authentication based on public key infrastructure (PKI). However, PKI based-systems generally suffer from certificate management and scalability problems. This paper ...

Recent years, lots of efforts have been devoted to construct secure schemes in certificateless cryptography which eliminates the key escrow problem in identity-based cryptography. However, most of them are designed in traditional certificateless cryptography which suffers from the single-point problem. Hierarchical cryptography exploits a practical security model to mirror the organizational hi...

This paper describes a solution for nodes and message authentication problems in wireless sensor networks, this solution allows effectively avoiding node-impersonation and messaging falsification among the WSN nodes. The resulting protocol address authentication at two level using identity based cryptography and message authentication codes with SHA-1, for node and message authentication respec...

Most of the existing Internet applications are built on the assumption of immediate end-to-end connectivity. However, there are many scenarios, like messaging in sparsely populated areas, in which immediate connectivity is not available. Traditional approaches for communication security may not apply in such disruption-prone environments. Recently, the use of identity-based cryptography has bee...