Patent
Encryption processing device and encryption processing method
Joshi Abe,Masashi Kanamaru,昌司 金丸,譲司 阿部 +3 more
- 07 Jul 2003
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TL;DR: In this paper, the authors proposed an encryption processing device where common key encryption processing comprising a plurality of stages of round functions is so constituted that F function output of each stage, that is intermediate data output value outputted from an S box via a replacement section, is stored as it is in an R register and an L register of a first data storage section and the reverse data of the output value is stored in an'register and a'register of another'register.
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Abstract: PROBLEM TO BE SOLVED: To provide an encryption processing device and an encryption processing method whose security level is high by enhancing the difficulty in cryptanalysis by means of measurement of electric power consumption. SOLUTION: The encryption processing device wherein common key encryption processing comprising a plurality of stages of round functions is so constituted that F function output of each stage, that is intermediate data output value outputted from an S box via a replacement section, is stored as it is in an R register and an L register of a first data storage section and the reverse data of the output value is stored in an R' register and an L' register of a second data storage section. Thus, the sum of Humming weight in register storing processing can be kept constant. As a result, the difficulty in acquiring Humming weight information concerning confidential information such as key information based on the observation of the change in device power consumption is enhanced, and the difficulty in cryptanalysis can be enhanced. COPYRIGHT: (C)2005,JPO&NCIPI
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Citations
Patent
Encryption processing apparatus
Hiromi Nobukata
- 05 Mar 2010
TL;DR: In this article, an encryption processing apparatus including a first register device, a second register device and a first flag operation device is described, as well as a first operation device and five operation devices.
43
Patent
Encryption processing circuit and encryption processing method
Masahiko Motoyama
- 02 Nov 2007
TL;DR: An encryption processing circuit includes: a decoder configured to convert a binary input data used for predetermined encryption computing into a first plurality of bit data of a constant hamming weight independently of the input data.
20
Patent
Cryptographic module and ic card
Masahiko Motoyama
- 21 Aug 2007
TL;DR: In this paper, a cryptographic module that performs a cryptographic operation is provided with: a register that retains first data related to key data to be used in the cryptographic operation; a register which retains second data without dependency on the first data; a selector that alternately selects and outputs the contents of the register retaining the first and second data; and a left shift circuit that performs predetermined shift operation on data outputted from the selector.
10
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Data converter, data conversion method, and data conversion program
Daisuke Suzuki,Saeki Minoru +1 more
- 11 Oct 2007
TL;DR: In this article, the authors proposed a safety device which can combat a side channel attack without the need to mount a random number generator, where an encryption processing device 100 receives input data of an object of data conversion, converts the input data by executing n cycles from 0th cycle to (n-1)th cycle in sequence and outputs them.
Patent
Division table preparation apparatus and program
Sato Tsuneo,Misawa Manabu +1 more
- 06 Nov 2008
TL;DR: In this article, the authors propose a division table preparation apparatus that is capable of opposing the thread of extracting secret information by analyzing power consumption or the like during operation processing when performing a cipher operation utilizing a general purpose CPU of a limited data bus width.
References
Patent
Encryption and decryption apparatus, encryption and decryption method and their program memory medium
Shinichi Kawamura,Fumihiko Ipd Kabushiki Kaisha Toshiba Sano,文彦 佐野,信一 川村 +3 more
- 20 Aug 1998
TL;DR: In this article, the reverse transposition P-1 of a mask was used to make the cryptanalysis by differential power analysis difficult without changing the results of the data encryption processing of the conventional encryption apparatus.
47
Patent
Cipher processor, IC card and cipher processing method
Mitsuru Matsui,Toshio Tokita +1 more
- 24 Apr 1998
TL;DR: In this article, a cipher processor configured to repetitively process a function F that has a recurring structure of a function f, comprising registers (301-303) to retain data temporarily, selectors A-C (311-313) to select data to be output, and function f calculation circuit (323) to perform data conversion.
20
Patent
Encoding and decoding device, method for encoding and decoding, data enciphering method and ic card
雅聡 ▲高▼橋,Masaaki Takahashi +1 more
- 16 Apr 2001
TL;DR: In this paper, one of non-inversion data corresponding to normal sentence data or processing unit data of an enciphered sentence or inversion data of the whole bits are fetched at random and, then, the data is inverted and ciphered in response to non-INversion data in a positive scrambling signal processing.
16
Patent
Register circuit and encryption arithmetic circuit using the same
Fujisaki Koichi,Motoyama Masahiko,Shinpo Atsushi,Tomoe Hiroki +3 more
- 05 Feb 2004
TL;DR: In this paper, a register circuit whose power consumption is fixed regardless of the change of internal states is proposed, where both data values on a data input line 21 and a data output line 22 of the main register 11 are determined to match with each other by a monitor circuit 12 which monitors the data values, and a write enable line 23 is activated synchronously with a clock signal CLK, and the value of data stored in the dummy register 13 is inverted.
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