Certificateless cryptography [1] is a new paradigm that not only removes the inherent key escrow problem of identity based public cryptography [2] (ID-PKC for short), but also eliminates the cumbersome certificate management in traditional PKI. In CL-PKC, the actual private key of a user is comprised of two secrets: a secret value and a partial private key. The user generates a secret value by ...

Security remains as a big challenge as there are many advancements as well as applications being proposed in the areas wireless adhoc networks and cloud computing. The modern field of cryptography is divided into two main areas based on the basic encryption mechanism as symmetric key cryptography and Public-key cryptography. Symmetric-key cryptosystems use the same key for encryption and decryp...

Protecting secret keys is crucial for cryptography. There are some relatively insecure devices (smart cards, mobile phones etc.) which have threat of key exposure. The goal of the forward security is to protect security of past uses of key even if the current secret key is exposed. In this paper we propose lattice based forward-secure identity based encryption scheme based on LWE assumption in ...

Certificateless public key cryptography was introduced to solve the complicated certificate management problem in traditional public key cryptography and the key escrow problem in identity-based cryptography. The aggregate signature concept is useful in special areas where the signatures on many different messages generated by many different users need to be compressed. This feature is very att...

Due to the rapid development in technology, every network, application needs full time connectivity without disruption and delays. The Delay/Disruption Tolerant Networking (DTN) concept is suitable for applications such as rural and disaster areas networks, animal and environmental monitoring plus others. However, due to the shared and unsecured nature of such challenged networks a good cryptog...

Mobile Ad hoc Network (MANET) is a wireless technology for mobile nodes. This network is setup on fly without any infrastructure. The mobility nature of this network and the lack of infrastructure make it very challenging to be secured. In this paper, we introduce a formal model for Identity-based RSA (Id-RSA) scheme proven secure in the random oracle model. The proposed scheme relies on establ...

Identity-Based (IB) cryptography is a rapidly emerging approach to public-key cryptography that does not require principals to pre-compute key pairs and obtain certificates for their public keys— instead, public keys can be arbitrary identifiers such as email addresses, while private keys are derived at any time by a trusted private key generator upon request by the designated principals. Despi...

A vast majority of spam emails today are sent from botnets with forged sender addresses. This has attracted researchers over the years to develop email sender authentication mechanism as a promising way to verify identity of the senders. In this paper we introduce iSATS, a new email sender authentication system based on Identity-based public key cryptography. iSATS leverages an identity based s...

Proxy blind Signature allows an original signer to delegate his/her signing capability to a proxy signer who performs message signing blindly on behalf of original signer but he cannot make any link between the blind signature and the identity of the message's owner. Using bilinear pairings, so many ID-based proxy blind signature (IDPBS) schemes have been proposed. But the computation cost of a...