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    HOMOMORPHIC PUBLIC-KEY ENCRYPTION SCHEME
    85.
    发明申请
    HOMOMORPHIC PUBLIC-KEY ENCRYPTION SCHEME 有权

    公开(公告)号：US20170201371A1

    公开(公告)日：2017-07-13

    申请号：US14990028

    申请日：2016-01-07

    申请人： Empire Technology Development LLC

    发明人： Masahiro YAGISAWA

    IPC分类号： H04L9/06 ,  H04L9/14 ,  H04L9/08

    CPC分类号： H04L9/0618 ,  H04L9/008 ,  H04L9/0822 ,  H04L9/14 ,  H04L2209/24

    摘要： Technologies are generally described for providing a fully homomorphic public key encryption scheme. In some examples, a method performed under control of a transmitter may include receiving, from a server, a system parameter; selecting a secret decryption key corresponding to the transmitter; generating a first public encryption key for the transmitter, based at least in part on the secret decryption key corresponding to the transmitter and the system parameter; receiving, from the server, a public encryption key corresponding to a receiver; enciphering a message into a first ciphertext, based at least in part on the public encryption key corresponding to the receiver and the secret decryption key corresponding to the transmitter; and transmitting, to a data processing device, a request to process the message by processing the first ciphertext that corresponds to the message into a second ciphertext without deciphering the first ciphertext.

    Data authentication device and data authentication method
    86.
    发明授权
    Data authentication device and data authentication method 有权

    公开(公告)号：US09705679B2

    公开(公告)日：2017-07-11

    申请号：US14895457

    申请日：2014-06-02

    申请人： MITSUBISHI ELECTRIC CORPORATION

    发明人： Manabu Misawa ,  Nobuhiro Kobayashi ,  Yukio Izumi ,  Tsuneo Sato

    IPC分类号： H04L29/06 ,  H04L9/32 ,  H04W12/06 ,  H04H20/62 ,  H04L9/30 ,  H04W4/04 ,  H04W12/10

    CPC分类号： H04L9/3242 ,  H04H20/62 ,  H04L9/30 ,  H04L9/3247 ,  H04L63/123 ,  H04L2209/24 ,  H04W4/046 ,  H04W12/06 ,  H04W12/10

    摘要： For improving, when performing road-vehicle communication or vehicle-vehicle communication between a roadside device and in-vehicle devices or therebetween, efficiency of distribution information verification including digital signature verification and freshness verification, there are included a memory unit that stores, as an authentication information history, a history of second authentication information of communication data which was received in the past from another communication device and which includes first authentication information, distribution information, and the second authentication information and an authentication processing unit that verifies, on the basis of the first authentication information of new communication data being newly received communication data, authenticity of the second authentication information of the new communication data and that compares the second authentication information of the new communication data with the authentication information history stored in the memory unit to verify freshness of the new communication data.

    One-way key switching method and implementation device
    87.
    发明授权
    One-way key switching method and implementation device 有权

    公开(公告)号：US09705671B2

    公开(公告)日：2017-07-11

    申请号：US14421400

    申请日：2013-07-15

    申请人： CHINA IWNCOMM CO., LTD.

    发明人： Qin Li ,  Manxia Tie ,  Ning Bu

    IPC分类号： H04L9/08 ,  H04L9/14

    CPC分类号： H04L9/0819 ,  H04L9/083 ,  H04L9/0891 ,  H04L9/14 ,  H04L2209/24 ,  H04L2209/601

    摘要： A one-way key switching method and an implementation device. The method comprises: after obtaining a new key and before deducing or determining that at least n receivers obtain the new key, a sender setting the sending direction of the new key as unavailable and keeping the sending direction of an original key as available; after obtaining the new key and before deducing or determining that at least n receivers obtain the new key, before the original key is invalid, the sender starting up a key switching process, i.e. setting the sending direction of the original key as unavailable and setting the sending direction of the new key as available; where N≧n≧1, N is the total number of the receivers corresponding to the sender.