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On announcement of "128-bit Block Cipher HyRAL"

January 27, 2010.

Laurel Intelligent Systems Co., Ltd. (hereinafter called "our company") announced the "128-bit Block Cipher HyRAL" in the "Symposium on Cryptography and Information Security 2010" held on January 19, 2010.

"HyRAL" is a highly secure algorithm that has been redesigned by applying our block cipher design technologies that were acquired through the development of our company's proprietary common key block cipher "SXAL/MBAL" that provides high security protection and efficiency, while taking into consideration the state-of-the-art analytical technologies and security protection measures. The data block size is 128-bit and the key size can be chosen among 128-bit, 192-bit and 256-bit.

Although "HyRAL" was first announced in the Information Security Workshop (ISEC) held on September 13, 2006, the one announced in the above symposium is an encryption algorithm that has been achieved high performance in the modes of implementation of software and hardware as well, while maintaining security levels that are required of the next-generation common cryptographic algorithms, developed by making improvements in s-Boxes and the function ƒ which is a basic function.

Our company plans to make an application on "HyRAL" in the field of common key ciphers in response to the public invitation of CRYPTREC.

■ Advantages of HyRAL

"HyRAL" is of a generalized FEISTEL structure consisting of 4 data lines, connecting the 4 different algorithm functions of G1, G2, F1 and F2. Unlike conventional FEISTEL structures, "HyRAL" has an advantage that each decryption is done by using an inverse function, instead of a decryption method by which decryption is done with the forward and backward use of expanded keys by means of the same algorithm.

■ Security of HyRAL

It has been shown that "HyRAL" provides sufficient protection against attacks of differential and linear cryptanalysis [1, 2], and its security level is demonstrated by the following data.

[1] Takagi, Igarashi, Kaneko: Security evaluation of HyRAL against Differential Attack SCIS2010, 1D1-2
[2] Igarashi, Takagi, Kaneko: Security evaluation of HyRAL against liner cryptanalysis SCIS2010, 1D1-3

(1) Secret key size
128 bits
single-key mode

8-bit truncation

  1. Upper bound on the maximum differential probability 2 -222
  2. Upper bound on the maximum linear probability 2 -228
(2) Secret key size
192/256 bits
double-key mode

8-bit truncation

  1. Upper bound on the maximum differential probability 2 -342
  2. Upper bound on the maximum linear probability 2 -318

■ HyRAL Technical Documents

Through the propagation of "HyRAL", our company is committed to making efforts and contributions to the development of better security technologies that can be used by our customers reliably.

Fukushige Hasegawa
President and Representative Director

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