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1. 发明申请

US20230139104A1 AUTHENTICATED ENCRYPTION APPARATUS, AUTHENTICATED DECRYPTION APPARATUS, AUTHENTICATED ENCRYPTION SYSTEM, METHOD, AND COMPUTER READABLE MEDIUM 有权
公开(公告)号：US20230139104A1
公开(公告)日：2023-05-04
申请号：US17918643
申请日：2020-04-23
申请人： NEC Corporation
发明人： Kazuhiko MINEMATSU , Akiko MUKAI , Naofumi HOMMA , Rei Ueno
IPC分类号： H04L9/32 , H04L9/06
摘要： An authenticated encryption apparatus capable of reducing delays in encryption and in decryption is provided. A nonce generation unit generates a nonce different from any of values generated in the past. A plaintext encryption unit generates a ciphertext corresponding to a plaintext by encrypting each of blocks obtained by dividing the plaintext by using the nonce as an auxiliary variable. A checksum generation unit generates a checksum by using the plaintext. A hash unit acquires a hash value. A nonce encryption unit acquires an encrypted nonce by encrypting the nonce. An authentication tag generation unit generates an authentication tag by using the checksum, the hash value, and the encrypted nonce.

2. 发明申请

US20200319853A1 RANDOM NUMBER GENERATION SYSTEM, RANDOM NUMBER GENERATION METHOD, AND RANDOM NUMBER GENERATION PROGRAM 审中-公开
公开(公告)号：US20200319853A1
公开(公告)日：2020-10-08
申请号：US16753077
申请日：2017-10-04
申请人： NEC Corporation
发明人： Yuki TANAKA , Kentarou SASAKI , Kazuhiko MINEMATSU
IPC分类号： G06F7/58 , G06F17/16 , G06F17/18 , H04L9/30
摘要： The random number generation system 10 includes: a first generation means 11 that generates a random number according to a one-dimensional discrete Gaussian distribution on a first lattice that is a lattice comprising an addition vector obtained by adding the second vector to the first vector and a subtraction vector obtained by subtracting the second vector from the first vector; a second generation means 12 that generates a random number according to a one-dimensional discrete Gaussian distribution on a second lattice that is the first lattice in which a vector obtained by dividing the sum of the addition vector and the subtraction vector by 2 is added; and an instruction means 13 that instructs the first generation means 11 or the second generation means 12 to generate a random number.

3. 发明申请

US20210021406A1 ENCRYPTION DEVICE, ENCRYPTION METHOD, PROGRAM, DECRYPTION DEVICE, AND DECRYPTION METHOD 有权
公开(公告)号：US20210021406A1
公开(公告)日：2021-01-21
申请号：US16970742
申请日：2018-02-21
申请人： NEC Corporation
发明人： Kazuhiko MINEMATSU
IPC分类号： H04L9/06 , H04L9/32 , G06F21/64
摘要： An encryption device includes an encryption unit that encrypts blocks, obtained by dividing a plaintext, with use of an auxiliary variable, a partial checksum generation unit that generates a plurality of partial checksums on the basis of the blocks obtained by dividing the plaintext, a meta checksum generation unit that generates a meta checksum on the basis of the partial checksums generated by the partial checksum generation unit, and a tag generation unit that generates a tag to be used for detecting tampering, on the basis of the meta checksum generated by the meta checksum generation unit. The encryption device outputs a ciphertext encrypted by the encryption unit and the tag generated by the tag generation unit.

4. 发明申请

US20180013550A1 MAC TAG LIST GENERATING APPARATUS, MAC TAG LIST VERIFYING APPARATUS, MAC TAG LIST GENERATING METHOD, MAC TAG LIST VERIFYING METHOD AND PROGRAM RECORDING MEDIUM 审中-公开
公开(公告)号：US20180013550A1
公开(公告)日：2018-01-11
申请号：US15521097
申请日：2015-10-16
申请人： NEC CORPORATION
发明人： Kazuhiko MINEMATSU
IPC分类号： H04L9/08 , H04L9/06
CPC分类号： H04L9/088 , H04L9/0643 , H04L9/3242
摘要： Disclosed is a MAC tag list generating apparatus capable of efficiently performing message authentication through which information pertaining to a falsified position as well as existence of falsification can be obtained. This MAC tag list generating apparatus is provided with: a group test matrix generating means for generating a group test matrix W, which is a parameter of a combined group test, on the basis of a plurality of items obtained by dividing an obtained message M; and a MAC tag list generating means that, while sharing results obtained by applying a pseudo random function to the items forming each row of the generated group test matrix W, sums the results, and then applies the summed results to pseudo random permutation to generate a MAC tag list T, which is a MAC tag list pertaining to the message M.

5. 发明申请

US20220173909A1 MAC TAG LIST GENERATION APPARATUS, MAC TAG LIST VERIFICATION APPARATUS, METHOD, AND PROGRAM 有权
公开(公告)号：US20220173909A1
公开(公告)日：2022-06-02
申请号：US17601136
申请日：2019-04-18
申请人： NEC Corporation
发明人： Kazuhiko MINEMATSU , Norifumi KAMIYA
IPC分类号： H04L9/32 , H04L9/06
摘要： A MAC tag list generation apparatus includes: a message input part; a group testing matrix generation part which generates a t×m group testing matrix H that is a parameter(s) of combinatorial group testing with respect to the number s (s being a positive integer) of the MACs to be generated, a decodable linear group testing MAC application part which, with respect to the message M, using the group testing matrix H, a variable-length-input fixed-length-output pseudorandom function F; and a Tweakable block cipher G for which a row index of the group testing matrix H is a Tweak, generates a MAC tag list T=(T[1], . . . , T[t]); and a MAC tag list output part which outputs the MAC tag list.

6. 发明申请

US20170272239A1 AUTHENTICATION ENCRYPTION METHOD, AUTHENTICATION DECRYPTION METHOD, AND INFORMATION-PROCESSING DEVICE 审中-公开
公开(公告)号：US20170272239A1
公开(公告)日：2017-09-21
申请号：US15504886
申请日：2015-08-18
申请人： NEC CORPORATION
发明人： Kazuhiko MINEMATSU
IPC分类号： H04L9/06
CPC分类号： H04L9/0662 , H04L9/0618 , H04L9/0637 , H04L9/0643
摘要： An information-processing device is provided with: a plaintext input unit for inputting plaintext; an initial vector generation unit for generating an initial vector; a common key block encryption unit for performing common key block encryption on the initial vector and generating an encrypted initial vector; a pseudorandom number generation unit which, accepting the encrypted initial vector as input, generates a pseudorandom number series in the same length as the plaintext; a keyed hash unit which, accepting the first portion of a ciphertext in which the pseudorandom number series and the plaintext are exclusive-OR'ed as input, generates a hash value; and a ciphertext output unit for concatenating the second and first portions of a ciphertext in which the hash value and the encrypted initial vector are exclusive-OR'ed and outputting the concatenated portions as a ciphertext.

7. 发明申请

US20200167406A1 INVERSE-IMAGE SAMPLING DEVICE, INVERSE-IMAGE SAMPLING METHOD, AND INVERSE-IMAGE SAMPLING PROGRAM 审中-公开
公开(公告)号：US20200167406A1
公开(公告)日：2020-05-28
申请号：US16611262
申请日：2017-05-12
申请人： NEC CORPORATION
发明人： Yuki TANAKA , Kazuhiko MINEMATSU
IPC分类号： G06F17/16 , H04L9/30 , H04L9/08 , G06F7/58
摘要： A grouping means 11 that extracts basis vectors from a set of basis vectors for a lattice having a predetermined relationship with a matrix used to generate a public key, and that groups the basis vectors such that a predetermined condition is satisfied. A sampling means 12 that samples, for at least one group, the same number of arbitrary values as the number of a plurality of basis vectors included in that group, in parallel for the individual basis vectors, onto a lattice constituted by the plurality of basis vectors, the arbitrary values serving as random numbers following a discrete Gaussian distribution. The predetermined condition is that each of the basis vectors included in a group is orthogonal to the other basis vectors included in the same group and is also orthogonal to Gram-Schmidt basis vectors, which are vectors obtained by orthogonalizing the other basis vectors by Gram-Schmidt orthogonalization.

8. 发明申请

US20200150928A1 RANDOM NUMBER GENERATION DEVICE, RANDOM NUMBER GENERATION METHOD, ENCRYPTION DEVICE, AND NON-TRANSITORY RECORDING MEDIUM 审中-公开
公开(公告)号：US20200150928A1
公开(公告)日：2020-05-14
申请号：US16633300
申请日：2017-07-26
申请人： NEC Corporation
发明人： Kazuhiko MINEMATSU , Yuki TANAKA , Kentarou SASAKI
IPC分类号： G06F7/58 , H04L9/06 , H04L9/08 , G09C1/00
摘要： Provided are a random number generation device and the like capable of calculating a high precision random number using a memory capacity selected irrespective of the precision of the random number. A random number calculation device is configured to generate first random numbers based on given number and specify, for the given number of second random numbers in a target numeric extent, bin range depending on the first random numbers based on frequency information representing cumulative frequency regarding a frequency of numeric extent including respective second random numbers among given numeric extents, the numeric extent being determined in accordance with a desirable precision.

9. 发明申请

US20200076609A1 AUTHENTICATION TAG GENERATION APPARATUS, AUTHENTICATION TAG VERIFICATION APPARATUS, METHOD AND PROGRAM 审中-公开
公开(公告)号：US20200076609A1
公开(公告)日：2020-03-05
申请号：US16605869
申请日：2017-04-17
申请人： NEC CORPORATION
发明人： Kazuhiko MINEMATSU
IPC分类号： H04L9/32 , G06F21/64 , H04L9/08 , H04L9/06
摘要： A hash function is computed for each item of a partial string obtained by dividing a message received according to a group testing matrix representing combinatorial group testing relating to the message, and an authentication tag for the partial string is generated using a value obtained by a combining operation of individual hash values by a combiner, wherein the combiner performs the combining operation of the individual hash values, by using a hash value of an item of an empty string as an identity element of the operation.

10. 发明申请

US20160173276A1 AUTHENTICATED ENCRYPTION DEVICE, AUTHENTICATED ENCRYPTION METHOD, AND PROGRAM FOR AUTHENTICATED ENCRYPTION 审中-公开
标题翻译：认证加密设备，认证加密方法和认证加密程序
公开(公告)号：US20160173276A1
公开(公告)日：2016-06-16
申请号：US14908212
申请日：2014-06-24
申请人： NEC CORPORATION
发明人： Kazuhiko MINEMATSU
IPC分类号： H04L9/06 , G09C1/00
CPC分类号： H04L9/0625 , G09C1/00 , H04L9/32
摘要： To achieve one-pass and one-rate authenticated encryption capable of performing parallel processings and totally performing encryption and decode processings by only one encryption function. An authenticated encryption device comprises an authenticated encryption means for applying a two-round Feistel structure using an encryption function assigned with an auxiliary variable for a round function per two blocks to an input plaintext or encrypted text thereby to generate an encrypted text or decoded plaintext. The authenticated encryption means finds an encrypted text chunk CC[i]=(C[i_1], C[i_2]) corresponding to an i-th plaintext chunk MC[i]=(M[i_1], M[i_2]) when dividing a plaintext into chunks per two blocks as: C[i_1]=F_K((N,Tw_i_1),M[i_1]) xor M[i_2], C[i_2]=F_K((N,Tw_i_2),C[i_1]) xor M[i_1].
摘要翻译：实现能够执行并行处理并通过仅一个加密功能完全执行加密和解码处理的一次通过和一次验证加密。经认证的加密装置包括经认证的加密装置，用于使用分配有用于每两个块的循环函数的辅助变量的加密功能将两轮Feistel结构应用于输入明文或加密文本，从而生成加密文本或解码的明文。认证加密装置找到与第i个明文块MC [i] =（M [i_1]，M [i_2]）对应的加密文本块CC [i] =（C [i_1]，C [i_2]）将明文划分为每两个块的块，如：C [i_1] = F_K（（N，Tw_i_1），M [i_1]）xor M [i_2]，C [i_2] = F_K（（N，Tw_i_2），C [i_1 ]）xor M [i_1]。

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