Information security has progressed dramatically over the past century because of the significant advancements in computer and communications research. As a result, numerous scholars have made it their major goal to examine, improve, implement, or compare its methods. Cryptography is one of the most critical information security topics, with many different encryption algorithms, such as symmetric key and public key encryption methods, branching out from it. Homomorphic encryption is a form of encryption that permits mathematical operations on a ciphertext; it has recently become famous for protecting data in the cloud. This paper offers essential knowledge to researchers who may want it before implementing homomorphic/public key methods. It analyses the unpadded RSA, Paillier, and ElGamal public-key algorithms. The evaluation is done according to several criteria, including secrecy, homomorphism property, encryption/decryption time, memory usage, encryption throughput criteria, and how different file sizes and key sizes affect these criteria. The results demonstrate that the three algorithms compete in the analysed criteria. Depending on the application and the required features, any one of the algorithms might be favoured over the other. 

Performance Evaluation of RSA, ElGamal, and Paillier Partial Homomorphic Encryption Algorithms

Today, in the computerized age, the development and use of internet technology in healthcare has been increasing rapidly. Quick improvement is going on in the telemedicine field with a clear goal to design integrated applications in diagnostics and treatment. Hence medical images are preserved in databases for some time so that post diagnosis treatment will become easier for the patient and for doctors as well. During the process of the treatment patients tend to take experts' advice and that time images of the reports will be shared from one hospital to another. With the use of sharing and transmission technique post treatment cost gets reduced whereas increases the issue concerning the security of patients medical reports. It is important to keep track of images shared between two medical centers to identify sources of image generation as well as protecting patient's sensitive information from intruders or hackers against unauthorized access and modification. Digital watermarking can be used to provide ownership and copyright protection. In the watermarking system image or text can be inserted in the cover image to get a watermarked image. The watermark image or secret image to be inserted can be protected with encryption technique. Hence this paper presents a digital watermarking system designed with encryption techniques to provide security to patients' medical records. The system is evaluated by implementing it with various encryption techniques like Advanced Encryption Standard (AES) with 256 bits, AES-GCM, Triple Data Encryption Standard (TDES), Blowfish etc. The performance of the system is measured with PSNR and SSIM and assessment of the evaluation parameters shows that AES encryption is better in comparison with TDES and Blowfish. 

Analysis of Different Encryption Techniques used in Watermarking Algorithm for the Security of Medical Image

In today’s world, data is termed as the new gold. The need for providing security to the data stored on local storage or at a remote location is a must. Various methods and algorithms are used for securing data one of which is using symmetric key cryptography. It is an encryption technique which uses a single key for the encryption and decryption process. This paper provides an extensive literature survey and puts forth a comparative analysis of the existing symmetric cryptography algorithms (Caesar, Vigenere, Data Encryption Standard, Triple Data Encryption Standard, Extended Data Encryption Standard, Rijndael, Twofish, Blowfish, Modified Blowfish) based on their architecture, flexibility, reliability, security and also states the limitations for each that are essential for secure communication through a wired or wireless medium.

Prasham Shah

Papers

A Comprehensive Analysis Between Popular Symmetric Encryption Algorithms