CLEFIA

About: CLEFIA is a research topic. Over the lifetime, 124 publications have been published within this topic receiving 3350 citations.

Very compact hardware implementations of the blockcipher CLEFIA

Abstract: The 128-bit blockcipher CLEFIA is known to be highly efficient in hardware implementations. This paper proposes very compact hardware implementations of CLEFIA-128. Our implementations are based on novel serialized architectures in the data processing block. Three types of hardware architectures are implemented and synthesized using a 0.13 $#956;m standard cell library. In the smallest implementation, the area requirements are only 2,488 GE, which are about half of the previous smallest implementation as far as we know. Furthermore, only additional 116 GE enable to support decryption.

Improved Differential Fault Analysis on CLEFIA

Abstract: We propose a more efficient differential fault analysis (DFA) attack on CLEFIA, the 128-bit block cipher developed by Sony Corporation in 2007. In the previous study, the most efficient DFA attack on CLEFIA with a 128-bit key uses approximately 18 pairs of correct and faulty ciphertexts. We develop a new attack method and show that only 2 pairs of correct and faulty ciphertexts are needed to retrieve the 128-bit key. The proposed attack uses a characteristic of the CLEFIA algorithm,a four-branch generalized Feistel structure with four 32-bit data lines. The simulation results of the proposed attack show that it takes less than 1 minute for 74.1% of a total simulation times, and less than 1 hour for 98.1% when using a PC.

The Improbable Differential Attack: Cryptanalysis of Reduced Round CLEFIA

Abstract: In this paper we present a new statistical cryptanalytic technique that we call improbable differential cryptanalysis which uses a differential that is less probable when the correct key is used. We provide data complexity estimates for this kind of attacks and we also show a method to expand impossible differentials to improbable differentials. By using this expansion method, we cryptanalyze 13, 14, and 15-round CLEFIA for the key sizes of length 128, 192, and 256 bits, respectively. These are the best cryptanalytic results on CLEFIA up to this date.

Efficient Fault Diagnosis Schemes for Reliable Lightweight Cryptographic ISO/IEC Standard CLEFIA Benchmarked on ASIC and FPGA

Abstract: Lightweight block ciphers are essential for providing low-cost confidentiality to sensitive constrained applications. Nonetheless, this confidentiality does not guarantee their reliability in the presence of natural and malicious faults. In this paper, fault diagnosis schemes for the lightweight internationally standardized block cipher CLEFIA are proposed. This symmetric-key cipher is compatible with yet lighter in hardware than the Advanced Encryption Standard and enables the implementation of cryptographic functionality with low complexity and power consumption. To the best of the authors' knowledge, there has been no fault diagnosis scheme presented in the literature for the CLEFIA to date. In addition to providing fault diagnosis approaches for the linear blocks in the encryption and the decryption of the CLEFIA, error detection approaches are presented for the nonlinear S-boxes, applicable to their composite-field implementations as well as their lookup table realizations. Through fault-injection simulations, the proposed schemes are benchmarked, and it is shown that they achieve error coverage of close to 100%. Finally, both application-specific integrated circuit and field-programmable gate array implementations of the proposed error detection structures are presented to assess their efficiency and overhead. The proposed fault diagnosis architectures make the implementations of the International Organization for Standardization/International Electrotechnical Commission-standardized CLEFIA more reliable.

TWIS --- A Lightweight Block Cipher

Abstract: A new 128-bit block cipher, TWIS is proposed It uses key size of 128-bits The design targets to software environment for resource constrained applications It is inspired from existing block cipher, CLEFIA Although the proposed design uses less resources as compared to CLEFIA, it compares favorably with CLEFIA in terms of security provided