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1. 发明专利

JPH1124558A CIPHERING DEVICE 失效
公开(公告)号：JPH1124558A
公开(公告)日：1999-01-29
申请号：JP17367197
申请日：1997-06-30
申请人： NIPPON TELEGRAPH & TELEPHONE , N T T ELECTRON KK
发明人： KANDA MASASUKI , TAKASHIMA YOICHI , AOKI KATSUHIKO , MATSUMOTO TSUTOMU
IPC分类号： H04L9/06 , G09C1/00
摘要： PROBLEM TO BE SOLVED: To increase the safety of a difference deciphering method and a linear deciphering method. SOLUTION: Similarly to the conventional DES(data encryption standard), input data is divided into two partial data R and L and the data R is nonlinearly converted by a nonlinear function means 304 with key data; and its output and the other partial data of the L are exclusively ORed and the array of the output and partial data R is converted into the data R and L, the same process is repeated and the input data are linearly converted 341 with key data in this case as a means 304 and the output is divided into bits in0 and in1 ; and one of function structures 3430 , 3431 ...3437 which are mutually and nonlinearly converted through three nonlinear means similar to one element S-box and three exclusive OR operations and in0 and in1 are inputted to the selected structure, whose outputs out0 and out1 are subjected to bit combination to obtain the output of the means 304.

2. 发明专利

DE69931606D1 未知
公开(公告)号：DE69931606D1
公开(公告)日：2006-07-06
申请号：DE69931606
申请日：1999-01-27
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： KANDA MASAYUKI , TAKASHIMA YOUICHI , AOKI KAZUMARO , UEDA HIROKI , OHTA KAZUO , MATSUMOTO TSUTOMU
IPC分类号： G09C1/00 , H04L9/06

3. 发明专利

CA2421142A1 DATA TRANSFORMATION DEVICE AND RECORDING MEDIUM HAVING RECORDED THEREON A PROGRAM FOR IMPLEMENTING THE SAME 未知
公开(公告)号：CA2421142A1
公开(公告)日：1999-07-29
申请号：CA2421142
申请日：1999-01-27
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： TAKASHIMA YOUICHI , UEDA HIROKI , MATSUMOTO TSUTOMU , OHTA KAZUO , KANDA MASAYUKI , AOKI KAZUMARO
IPC分类号： H04L9/14

4. 发明专利

DE69931606T8 未知
公开(公告)号：DE69931606T8
公开(公告)日：2007-06-28
申请号：DE69931606
申请日：1999-01-27
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： KANDA MASAYUKI , TAKASHIMA YOUICHI , OKI KAZUMARO , UEDA HIROKI , OHTA KAZUO , MATSUMOTO TSUTOMU
IPC分类号： G09C1/00 , H04L9/06

5. 发明专利

DE69931606T2 未知
公开(公告)号：DE69931606T2
公开(公告)日：2007-03-08
申请号：DE69931606
申请日：1999-01-27
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： KANDA MASAYUKI , TAKASHIMA YOUICHI , AOKI KAZUMARO , UEDA HIROKI , OHTA KAZUO , MATSUMOTO TSUTOMU
IPC分类号： G09C1/00 , H04L9/06

6. 发明专利

DE69829566T2 未知
公开(公告)号：DE69829566T2
公开(公告)日：2006-02-16
申请号：DE69829566
申请日：1998-06-30
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： KANDA MASAYUKI , TAKASHIMA YOUICHI , AOKI KATSUHIKO , MATSUMOTO TSUTOMU
IPC分类号： G09C1/00 , H04L9/06

7. 发明公开

EP1001398A4 CIPHERING APPARATUS 失效
标题翻译：加密设备
公开(公告)号：EP1001398A4
公开(公告)日：2002-01-30
申请号：EP98929747
申请日：1998-06-30
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： KANDA MASAYUKI , TAKASHIMA YOUICHI , AOKI KATSUHIKO , MATSUMOTO TSUTOMU
IPC分类号： G09C1/00 , H04L9/06
CPC分类号： H04L9/0625 , H04L2209/125
摘要： A ciphering apparatus of common key type, wherein a plurality of rounding units are connected in cascade, the i-th rounding unit is fed with input data Li, Ri, the input data Ri are subjected to nonlinear transformation by a nonlinear function unit depending upon the key data, the exclusive-OR output of the output of the nonlinear function unit and the input data Li is outputted as data Ri+1 to the (i+1)-th rounding unit, and the input data Ri are outputted as data Li+1 to the (i+1)-th rounding unit. The nonlinear function unit includes: a key-dependent linear transforming unit for subjecting the input Ri to key-dependent linear transformation; a dividing unit for dividing the output into four data in0, in1, in2 and in3; first nonlinear transforming units for subjecting the divided data to nonlinear transformation to output data mid00, mid01, mid02 and mid03; a key-dependent linear transforming unit for correlating these transformed outputs to each other and subjecting them to linear transformation based upon the key data to output data mid10, mid11, mid12 and mid13; second nonlinear trasnforming units for subjecting the transformed outputs to nonlinear transformation to output data out0, out1, out2 and out3; and a coupling unit for coupling the transformed outputs to output data Y.

8. 发明专利

DE69829566D1 未知
公开(公告)号：DE69829566D1
公开(公告)日：2005-05-04
申请号：DE69829566
申请日：1998-06-30
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： KANDA MASAYUKI , TAKASHIMA YOUICHI , AOKI KATSUHIKO , MATSUMOTO TSUTOMU
IPC分类号： G09C1/00 , H04L9/06

9. 发明专利

CA2319135C DATA TRANSFORMATION DEVICE AND RECORDING MEDIUM HAVING RECORDED THEREON A PROGRAM FOR IMPLEMENTING THE SAME 未知
公开(公告)号：CA2319135C
公开(公告)日：2003-06-17
申请号：CA2319135
申请日：1999-01-27
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： TAKASHIMA YOUICHI , KANDA MASAYUKI , MATSUMOTO TSUTOMU , OHTA KAZUO , UEDA HIROKI , AOKI KAZUMARO
IPC分类号： H04L9/06 , G09C1/00
摘要： A plurality of round processing parts (38) are provided each of which contains a nonlinear function part (304), and each nonlinear function part (304) comprises: a first key-dependent linear transformation part (341) whic h performs a linear transformation based on a subkey; a splitting part (342) which splits the output from the first key-dependent linear transformation part into n pieces of subdata; a first nonlinear transformation part (343) which nonlinearly transforms those pieces of subdata, respectively; a second key- dependent linear transformation part (344) which linearly transforms those nonlinearly transformed outputs based on a subkey and outputs n pieces of transformed subdata; a second nonlinear transformation part (345) which nonlinearly transforms those transformed subdata; and a combining part (346) which combines the nonlinearly transformed outputs. An n x n matrix, which represents the linear transformation in the second key-dependent linea r transformation part (344), is formed by n vectors whose Hamming weights are equal to or larger than T-1 for a security threshold T, thereby increasi ng the invulnerability against differential cryptanalysis and linear cryptanalysis.

10. 发明专利

CA2319135A1 DATA TRANSFORMATION DEVICE AND RECORDING MEDIUM HAVING RECORDED THEREON A PROGRAM FOR IMPLEMENTING THE SAME 未知
公开(公告)号：CA2319135A1
公开(公告)日：1999-07-29
申请号：CA2319135
申请日：1999-01-27
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： MATSUMOTO TSUTOMU , TAKASHIMA YOUICHI , UEDA HIROKI , AOKI KAZUMARO , KANDA MASAYUKI , OHTA KAZUO
IPC分类号： H04L9/06 , G09C1/00
摘要： A plurality of round processing parts (38) are provided each of which contains a nonlinear function part (304), and each nonlinear function part (304) comprises: a first key-dependent linear transformation part (341) whic h performs a linear transformation based on a subkey; a splitting part (342) which splits the output from the first key-dependent linear transformation part into n pieces of subdata; a first nonlinear transformation part (343) which nonlinearly transforms those pieces of subdata, respectively; a second key- dependent linear transformation part (344) which linearly transforms those nonlinearly transformed outputs based on a subkey and outputs n pieces of transformed subdata; a second nonlinear transformation part (345) which nonlinearly transforms those transformed subdata; and a combining part (346) which combines the nonlinearly transformed outputs. An n x n matrix, which represents the linear transformation in the second key-dependent linea r transformation part (344), is formed by n vectors whose Hamming weights are equal to or larger than T-1 for a security threshold T, thereby increasi ng the invulnerability against differential cryptanalysis and linear cryptanalysis.

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