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61. 发明申请

WO2016005552A1 METHOD AND DEVICE FOR CRYPTOGRAPHIC KEY GENERATION 审中-公开
标题翻译：用于生成关键生成的方法和装置
公开(公告)号：WO2016005552A1
公开(公告)日：2016-01-14
申请号：PCT/EP2015/065807
申请日：2015-07-10
申请人： THOMSON LICENSING
发明人： JOYE, Marc , BEN HAMOUDA, Fabrice , LIBERT, Benoît
IPC分类号： H04L9/08 , H04L9/30
CPC分类号： H04L9/3033 , H04L9/0861 , H04L9/16 , H04L9/3006 , H04L2209/80
摘要： A method and a device (110) for generation of a cryptographic key pair for use in a (generalized) Goldwasser-Micali cryptosystem. The device (110) generates a first prime ρ ≡ 1 (mod 2 k ), (S10; S20) where k ≥ 1 is an integer, and a second prime q ≡ 3 (mod 4) (S11) or q ≡ 1 (mod 4) (S21); computes (S12; S22) a modulus N = ρq ; picks (S13; S23) an integer y formula (I), where formula (II) is a set of integers whose Jacobi symbol is 1 and formula (III) is a set of quadratic residues; and outputs (S14; S24) a public key ρk = { N, y, k } and a private key sk = { ρ , k }.
摘要翻译：一种用于生成用于（广义的）Goldwasser-Micali密码系统的密码密钥对的方法和设备（110）。装置（110）生成第一素数ρ≡1（mod2k），（S10; S20）其中k≥1是整数，第二素数q≡3（mod 4）（S11）或q≡1（ mod 4）（S21）; 计算（S12; S22）模数N =ρq; 选择（S13; S23）整数y公式（I），其中公式（II）是Jacobi符号为1并且公式（III）是一组二次残基的整数集合; 并输出（S14; S24）公开密钥ρk= {N，y，k}和私钥sk = {ρ，k}。

62. 发明申请

WO2015191921A1 METHOD AND SYSTEM FOR PRIVACY-PRESERVING RECOMMENDATIONS 审中-公开
标题翻译：用于隐私保护建议的方法和系统
公开(公告)号：WO2015191921A1
公开(公告)日：2015-12-17
申请号：PCT/US2015/035424
申请日：2015-06-11
申请人： THOMSON LICENSING
发明人： WEINSBERG, Ehud , JOYE, Marc , IOANNIDIS, Efstratios
IPC分类号： G06F21/62 , G06Q30/06 , H04L9/00
CPC分类号： G06F21/6245 , G06Q30/0282 , G06Q30/0631 , H04L9/008 , H04L2209/60
摘要： Various examples of systems and methods for providing recommendations that can be tailored to a user while preserving the privacy of the user's personal information are disclosed. In various examples, third party-encrypted user ratings and corresponding content item identifications can be obtained. The third party- encrypted user ratings can be indexed based on the corresponding content item identifications. In some examples, the indexing can also be based on user identifications corresponding to the third party-encrypted user ratings. The third party-encrypted user rating can be stored based on the indexing.
摘要翻译：公开了用于提供可以针对用户定制的建议的系统和方法的各种示例，同时保持用户的个人信息的隐私。在各种示例中，可以获得第三方加密的用户评级和相应的内容项目标识。第三方加密的用户评级可以根据相应的内容项目标识进行索引。在一些示例中，索引也可以基于对应于第三方加密的用户评级的用户标识。可以基于索引来存储第三方加密的用户等级。

63. 发明申请

WO2015118160A1 SIGNING METHODS FOR DELIVERING PARTIAL SIGNATURES, AND/OR THRESHOLD SIGNATURES, CORRESPONDING VERIFICATION METHODS, AND CORRESPONDING ELECTRONIC DEVICES 审中-公开
标题翻译：用于传递部分信号和/或阈值信号的签名方法，相应的验证方法和相应的电子设备
公开(公告)号：WO2015118160A1
公开(公告)日：2015-08-13
申请号：PCT/EP2015/052681
申请日：2015-02-10
申请人： THOMSON LICENSING
发明人： JOYE, Marc , LIBERT, Benoit
IPC分类号： H04L9/32
CPC分类号： H04L9/3255
摘要： In one embodiment, it is proposed a signing method delivering a partial signature associated with a message, said partial signature being used in a threshold signing method, the signing method being executed on an electronic device. The signing method is remarkable in that it comprises: - obtaining a partial secret key SK i being obtained from an output of a secret sharing scheme, said partial secret key SK i being equal to {u1 ( i ), u K+1 ( i )}, where elements u j ( i ) ∈ Z p for all j ∈ {1,..., K + 1}, with p being a prime number, and K being an integer greater or equal to one; - determining from said partial key, K elements tj = g -uj(i) , with j ∈ {1,..., K + 1} and g being a generator of a group G, said group G being part of a bilinear group (G, Ĝ, G T ) with Ĝ being a group and G T being a target group; - determining from said message a vector so as to define a Groth-Sahai common reference string; - determining Groth-Sahai commitments on said K + 1 elements t j with j ∈ {1,..., Κ + 1} from said Groth-Sahai common reference string, said Groth-Sahai commitments belonging to said group G; and - determining a non-interactive witness indistinguishable proof comprising K ( K + 1) elements, all the K ( K + 1) elements belonging to said group Ĝ, said proof guarantying that said K + 1 elements tj verify K pairing equations; - delivering said partial signature associated with said message, said partial signature comprising said Groth-Sahai commitments, and said non-interactive witness indistinguishable proof.
摘要翻译：在一个实施例中，提出了传递与消息相关联的部分签名的签名方法，所述部分签名在阈值签名方法中使用，所述签名方法在电子设备上执行。签名方法是显着的，其包括： - 获得从秘密共享方案的输出获得的部分秘密密钥SK i，所述部分秘密密钥SK i等于{u1（i），uK + 1（i） }，其中对于所有j∈{1，...，K + 1}，元素uj（i）∈Zp，其中p是素数，K是大于或等于1的整数; - 从所述部分密钥确定K个元素tj = g -uj（i），其中j∈{1，...，K + 1}，g是组G的生成器，所述组G是双线性组（G，Ĝ，GT），Ĝ为组，GT为目标组; - 从所述消息确定向量以定义Groth-Sahai公共参考串; 表示所罗门群岛G所表示的Groth-Sahai承诺，对所述第K + 1个元素t j确定了Groth-Sahai承诺，其中j∈{1，...，Κ+ 1} 以及 - 确定包含K（K + 1）个元素，属于所述组，的所有K（K + 1）个元素的非交互式证据不可区分的证明，所述证明保证所述K + 1个元素tj验证K个配对方程; - 提供与所述消息相关联的所述部分签名，所述部分签名包括所述Groth-Sahai承诺，以及所述非交互式证人不可区分的证明。

64. 发明申请

WO2014138752A3 A METHOD AND SYSTEM FOR PRIVACY PRESERVING MATRIX FACTORIZATION 审中-公开
公开(公告)号：WO2014138752A3
公开(公告)日：2014-09-12
申请号：PCT/US2014/036357
申请日：2014-05-01
申请人： THOMSON LICENSING
发明人： IOANNIDIS, Efstratios , WEINSBERG, Ehud , TAFT, Nina, Anne , JOYE, Marc , NIKOLAENKO, Valeria
IPC分类号： H04L9/00 , H04N21/466
摘要： A method and a system for securely profiling items through matrix factorization for use in recommendation systems commences by receiving as input a set of records including tokens and items, without learning the content of any individual record; designing and evaluating a garbled circuit based on matrix factorization on the set of records to generate item profiles in a privacy-preserving way about at least one item, without learning the content of any individual record or any information extracted from the records other than the item profiles. The system includes three parties: a plurality of users or a database representing a Source for the records; a Crypto-Service Provider which will design the garbled circuit and a Recommender System which will evaluate the circuit, such that the records and any information extracted from the records other than the item profiles are kept secret from parties other than their source.

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