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As everyone is aware that security of data communication is essential in modern scenario. There is a continuous fight between cryptographers and cryptanalysists. Cryptographers want to develop new methods and protocols to safeguard the valuable information but on the other side, cryptanalysists find various methods to extract the information. So a new sequential coding based method for securing data communication is proposed here. The proposed method requires an encryption key along with other ingredients and it can be implementable very easily in various situations. The security analysis is also provided to prove the validity. The claim is that the proposed method also satisfies Kerchoff's law of secrecy. We want to keep the method simple enough so that it can be used on mobile phones as well.

Now a day's electronic health record (EHR) systems are in vogue. Many big countries like Australia and China are implementing new secure ways to store patient's data. This data can be analyzed in variety of purposes. It is very important to mention that this data or the access to this data has to be secured. If an intruder has unauthorized access to this data then the entire system is in trouble. In this paper, we present an innovative and secure method to store patient health record (when the patient is in medical observation) which is useful in emergency situations as well.

All of us know that authentication and key agreement are the two cryptographic services very important for data communication. People use online methods for information exchange using various wireless communication channels. Intruders want to steal sensitive useful information and they use different cryptanalysis ways for that. Quantum computing methods also produces danger for all the existing protocols and algorithms. So at this point of time, it is essential that researchers find new and innovative protocols for data communication in order to surprise intruders. In this paper we present three party key sharing protocol and its correctness involving polynomial rings.

Signcryption is comparatively new approach in public key cryptography. Signcryption has the virtue to provide the services of digital signature and public key encryption in a single step. So when we compare it in terms of cost and ease of use, signcryption is better than “signature then encryption” (or encryption then signature) approach. So signcryption protocols are obvious choice for WTLS where authentication along with savings of computational overheads is always desired. In this paper we present a signcryption protocol for WTLS using bit commitment scheme with its security analysis.