Abstract
Security of data stored inside storage devices is becoming one of the main issues in computer security now. It is known that the most efficient techniques to protect storage devices are using cryptography. Developing newer and more secure encryption algorithms and modes of operation might be critically important to protect these devices since conventional disk encryption algorithms, such as CBC mode, have shown serious security flaws. In this paper, the IEEE XTS encryption mode of operation for storage encryption (P1619 standard) has been implemented using parallel design. A performance comparison between the sequential and parallel algorithms of XTS mode is presented here. Parallel overheads that prevented from achieving perfect linear speedup are measured and minimized. The parallel XTS algorithm has shown a speedup of 1.80, with 90% efficiency, faster than the sequential algorithm. In these simulations, AES is used as encryption algorithm with 256-bit encryption key. Keywords: XTS Mode, Disk Encryption, Encryption Modes, Parallel Processing
Highlights
IntroductionData security is an essential part of computer security whether it is data in transit (transmitted data through networks) or data at rest (stored data in storage devices)
Data security is an essential part of computer security whether it is data in transit or data at rest
Ciphertext Stealing (CTS) is a method used in modes of operations to deal with messages which can not be divided into a multiple of the block size (e.g. 128 bit for advanced encryption standard (AES))
Summary
Data security is an essential part of computer security whether it is data in transit (transmitted data through networks) or data at rest (stored data in storage devices). IEEE institute has launched SISWG (Security In Storage Working Group) task force which developed a standard called P1619 standard[2] This standard has introduced an encryption mode of operation named XTS (XEX encryption mode with tweak and ciphertext stealing) so that it can be used as alternative to the current insecure modes of. This paper implements the XTS encryption mode of operation in a parallel design which efficiently enhances the performance of the mode. Overheads in parallel XTS algorithms are measured, using OmpP5 profiling tool, and minimized to improve speedup This simulation work has been performed in a Linux environment using a hardware oriented tools such as C language, GCC compiler, and OpenMP API which may allow the simulations code to be implemented in hardware such as a disk controller or FPGA.
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