公开(公告)号：US11909867B2

公开(公告)日：2024-02-20

申请号：US17607776

申请日：2019-05-29

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

发明人： Junichi Tomida ,  Fumitaka Hoshino ,  Akira Nagai

IPC分类号： H04L9/08

CPC分类号： H04L9/0825 ,  H04L9/0827

摘要： A key exchange system, for generating a shared key for performing encrypted communication between multiple communication devices, includes the multiple communication devices. Each of the multiple communication devices includes a memory, and a processor configured to generate a short term private key by using a private key, generate a short term public key on one of asymmetric pairing groups used for the ID based encryption, by using the short term private key, and generate a shared key for performing encrypted communication with another communication device by performing a first pairing operation using a private key generated on another one of the asymmetric pairing groups and a short term public key generated in the other communication device, and performing a second pairing operation using the short term private key of the communication device and public information used in generating a private key of the other communication device.

公开(公告)号：US11973884B2

公开(公告)日：2024-04-30

申请号：US17610100

申请日：2019-05-27

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

发明人： Fumitaka Hoshino

IPC分类号： H04L9/32

CPC分类号： H04L9/3255

摘要： An anonymous signature system in which a signature σ is anonymized by an agent specified by a signer, includes computers each including a memory and a processor configured to, from a security parameter, generate a system parameter ρ independent of the agent; from ρ, generate an agent secret key w and an agent public key gA; from ρ, generate a secret key x and a public key y of the signer; from x, a message m on which σ is to be put, and gA, generate σ to be put on m; from an identifier i of the signer, w, σ, a ring L representing a group to which the signer belongs, a list yL of public keys y of signers in L, and m, generate a ring signature σ′ by anonymizing σ; and from L, yL, m, and σ′, output a verification result b form.

公开(公告)号：US11902428B2

公开(公告)日：2024-02-13

申请号：US17626443

申请日：2020-07-16

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION ,  National University Corporation TOYOHASHI UNIVERSITY OF TECHNOLOGY

发明人： Junichi Tomida ,  Fumitaka Hoshino ,  Akira Nagai ,  Atsushi Fujioka ,  Koutarou Suzuki

IPC分类号： H04L29/06 ,  H04L9/08 ,  H04L9/32

CPC分类号： H04L9/0825 ,  H04L9/083 ,  H04L9/0847 ,  H04L9/3242

摘要： A key exchange system in which a shared key is generated for executing encrypted communication between communication apparatuses according to an authenticated key exchange protocol using ID-based encryption, wherein each communication apparatus includes a memory and a processor configured to generate a short-term private key by using a private key of the communication apparatus; generate a short-term public key of the communication apparatus by using the short-term private key; generate private information on the communication apparatus by using the short-term private key, a short-term public key generated by another communication apparatus, and public information generated by the communication apparatus and said another communication apparatus or public information generated by a key delivering center; and generate the shared key for executing encrypted communication with said another communication apparatus by executing a pairing operation using the private key of the communication apparatus and the private information.