Search

Cloud computing presents a new approach to allow the development of dynamic, distributed and highly scalable software (e.g., networks, servers, storage, applications, and services) that can be rapidly supplied and allowed us with minimal management effort or service provider interaction. Cloud computing provides many advantages to its customers but failing to solve information security concerns. Strong encryption with key management is one of the core mechanisms that Cloud Computing systems should use to secure data, so key management is an important technology that can help secure applications and data in the cloud. In this paper, a proposed elliptic curve based distributed key generation (ECDKG) scheme for Transient Clouds is presented. Performance analysis showed that this scheme not only has strong security, but also has less computational and communication costs.

Cloud computing provides innumerable benefits to its customers but failing to solve information security concerns. Cloud customers and providers need to guard against data loss and theft. Encryption of personal and enterprise data is strongly recommended. Strong encryption with key management is one of the core mechanisms that Cloud Computing systems should use to protect data, so key management is an important technology that can help secure applications and data in the cloud. In this paper, a formal analysis of a user authentication protocol for cloud computing is presented. Analysis show that the protocol is vulnerable to replay and Man-in-the middle attacks. To overcome these attacks, a modified authentication protocol for the cloud computing environment is proposed.

 Abstract—Governmental bodies, such as military and national security agencies, keep looking for proprietary encryption algorithms to secure their confidential communication applications. Customizing published encryption algorithms is a trend to acquire proprietary encryption algorithms at affordable research and development cost. Cost, here, may be represented by the required efforts for designing and testing the customized algorithm. The security architecture of the 3 rd Generation Partnership Project (3GPP) mobile communications includes a standardized encryption algorithm F8 which is based on the KASUMI block cipher algorithm. In this paper we propose a newly customized version of the KASUMI block cipher. The customization is targeting the S-boxes of KASUMI. New S-Boxes are generated and tested to verify the required cryptographic features.

Maximum Distance Separable matrices became the state of the art as a diffusion component in block cipher design for example those MDS matrices used in algorithms such as AES and Twofish. This paper firstly reviews the relation between coding theory and cryptography in the context of providing optimal diffusion. Secondly, The Vandermonde and Cauchy based methodologies introduced by Mahdi Sajadieh et al. and J. Nakahara respectively for generating Involutory MDS matrices that are proposed to provide full block diffusion in order to decrease number of rounds of a block cipher were assessed. Finally Punctured MDS matrices are proposed to provide dynamicity of a block cipher, which guaranteed to provide optimum diffusion that should be considered in security proof against Linear and Differential Cryptanalysis of a block cipher.