WO2020172882A1 - 择一客户端为多客户端多服务器生成密钥的方法和设备 - Google Patents

择一客户端为多客户端多服务器生成密钥的方法和设备 Download PDF

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Publication number
WO2020172882A1
WO2020172882A1 PCT/CN2019/076578 CN2019076578W WO2020172882A1 WO 2020172882 A1 WO2020172882 A1 WO 2020172882A1 CN 2019076578 W CN2019076578 W CN 2019076578W WO 2020172882 A1 WO2020172882 A1 WO 2020172882A1
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Prior art keywords
key
client
clients
servers
components
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PCT/CN2019/076578
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English (en)
French (fr)
Inventor
颜泽
谢翔
傅志敬
孙立林
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云图有限公司
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Priority to PCT/CN2019/076578 priority Critical patent/WO2020172882A1/zh
Publication of WO2020172882A1 publication Critical patent/WO2020172882A1/zh

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/08Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords

Definitions

  • This application belongs to the field of information security technology, and in particular relates to a method and device for generating keys for multiple clients and multiple servers by selecting a client.
  • a key server generally generates the key, and then distributes the generated key to the key users. This will inevitably increase the burden on the key server, and because a single key server The key server generates all key generation rules, which are specified and maintained by the key server itself, which is not flexible.
  • the purpose of this application is to provide a method and device for generating keys for multiple clients and multiple servers by selecting one client, which can improve the security and flexibility of key management.
  • This application provides a method and device for generating keys for multiple clients and multiple servers by selecting one client.
  • a method for selecting a client to generate a key for multiple client servers is provided, which is applied to a key management system.
  • the key management system includes: N clients and N key servers, where N Is a positive integer greater than or equal to 2, and the method includes:
  • the first client generates a complete target private key, and generates a target public key according to the target private key, where the first client is one of the N clients;
  • the first client splits the target private key into 2N key components, and generates a public key component for each key component in the 2N private key to obtain 2N public key components;
  • the first client sends 2N key components, 2N public key components, and the target public key to N clients in a one-to-one correspondence through the secure channel established between the client and the key server.
  • N key servers
  • the method further includes:
  • the first client initiates a signature request, wherein the signature request carries data to be signed;
  • Each of the N clients and the N key servers except the MPC computing party and the key server split their corresponding key components into a first subkey and a second subkey , And transmit the first subkey to the first device in the MPC calculation party through the secure channel, and transmit the second subkey to the second device in the MPC calculation party;
  • the first device and the second device initiate MPC calculations through the secure channel to sign the data to be signed to obtain a signature file;
  • the signature file is sent to each of the N clients and the N key servers except the MPC computing party.
  • the method further includes:
  • the first client initiates a key refresh request
  • Each of the N clients and the N key servers except the MPC computing party and the key server split their corresponding key components into a first subkey and a second subkey , And transmit the first subkey to the first device in the MPC calculation party through the secure channel, and transmit the second subkey to the second device in the MPC calculation party;
  • the first device and the second device initiate MPC calculations through the secure channel to obtain 2N refresh key components split based on the target private key, and sign the 2N refresh key components to obtain 2N signatures file;
  • the N clients and N key servers verify the correctness of the received refresh key component by receiving the signature file, and if the verification is passed, save the received refresh key component.
  • the method further includes:
  • the first client initiates a signature request, wherein the signature request carries the data to be signed and the target public key;
  • the N clients and the N key servers initiate MPC calculations through the secure channel to perform a signature operation on the data to be signed to obtain a signature file, and verify the signature file according to the target public key The correctness.
  • the method further includes:
  • the first client initiates a key refresh request
  • the N clients and the N key servers initiate MPC calculations through the secure channel to obtain 2N refresh key components split based on the target private key, and sign the 2N refresh key components to obtain 2N signed documents;
  • the N clients and the N key servers verify the correctness of the received signature file through the target public key, and if the verification is passed, update and save the received refresh key component.
  • the method further includes:
  • the first client splits the backup key into 2N backup key components, and signs the 2N backup key components with the target private key to obtain 2N signature files;
  • the first client sends the 2N backup key components and the 2N signature file to the N clients and N key servers in a one-to-one correspondence through the secure channel;
  • the N clients and the N key servers verify the validity of the received signature file through the stored target public key, and if the signature file is determined to be valid, update and save the received backup secret. Key component.
  • a complete target private key is generated at the first client, and a target public key is generated according to the target private key, wherein the first client is one of the N clients After that, it also includes:
  • the two-way authentication is completed between the N clients and the N servers through an identity confirmation procedure, and authentication materials are issued, where the authentication materials are used for authentication and establish the secure channel.
  • the identity confirmation program includes at least one of the following: short message, verification code, account key, fingerprint, face, certificate.
  • a terminal device which includes a processor and a memory for storing executable instructions of the processor, and the processor implements the steps of the following method when executing the instructions:
  • the first client generates a complete target private key, and generates a target public key according to the target private key, where the first client is one of the N clients;
  • the first client splits the target private key into 2N key components, and generates a public key component for each key component in the 2N private key to obtain 2N public key components;
  • the first client sends 2N key components, 2N public key components, and the target public key to N clients in a one-to-one correspondence through the secure channel established between the client and the key server.
  • N key servers
  • a computer-readable storage medium is provided, and computer instructions are stored thereon, which implement the steps of the following method when executed:
  • the first client generates a complete target private key, and generates a target public key according to the target private key, where the first client is one of the N clients;
  • the first client splits the target private key into 2N key components, and generates a public key component for each key component in the 2N private key to obtain 2N public key components;
  • the first client sends 2N key components, 2N public key components, and the target public key to N clients in a one-to-one correspondence through the secure channel established between the client and the key server.
  • N key servers
  • the method for selecting a client to generate a key for multiple client servers provided in this application is applied to a key management system.
  • the key management system includes: multiple clients and multiple key servers, which are generated by one of the clients.
  • the complete target private key and target public key are then split to obtain multiple key components and issued, one for each client and key server, so as to realize the generation of key components and public keys, which is solved by the above method.
  • the problem of low security and flexibility in the existing key management system is solved, and the technical effect of effectively improving the security and flexibility of the key management system is achieved.
  • Figure 1 is an architectural diagram of the key system provided by this application.
  • FIG. 2 is a method flowchart of the method for selecting a client to generate a key for a multi-client server provided by this application;
  • FIG. 3 is a schematic diagram of the interaction of the key generation of Example 1 provided by this application.
  • FIG. 4 is a schematic diagram of the interaction of the key usage of Example 1 provided by the present application.
  • FIG. 5 is a schematic diagram of the interaction of the key backup of Example 1 provided by this application.
  • Example 6 is a schematic diagram of the interaction of the key recovery of Example 1 provided by this application.
  • FIG. 7 is a schematic diagram of the interaction of the key refresh of Example 1 provided by the present application.
  • FIG. 8 is a schematic diagram of the interaction of the key generation of Example 2 provided by this application.
  • FIG. 9 is a schematic diagram of the interaction of the key usage of Example 2 provided by this application.
  • FIG. 10 is a schematic diagram of the interaction of the key recovery of Example 2 provided by this application.
  • FIG. 11 is a schematic diagram of the interaction of the key refresh of Example 2 provided by the present application.
  • FIG. 12 is a schematic diagram of the structure of a computer terminal provided by this application.
  • one of the multiple clients in the key management system is multiple
  • the client and multiple key servers generate private and public keys, which are then split into multiple key components and distributed to each key server.
  • the client and key server use these key components to sign , Update and other operations, which can improve the flexibility of key generation and key security.
  • the key management method for a single client to generate a private key is applied to a key system, as shown in Figure 1.
  • the key system includes: N clients and N key servers, where , N is an integer greater than or equal to 2.
  • Fig. 2 is a method flowchart of an embodiment of a method for selecting a client to generate a key for a server of multiple clients described in this application.
  • this application provides method operation steps or device structures as shown in the following embodiments or drawings, the method or device may include more or fewer operation steps or module units based on conventional or no creative labor. .
  • the execution order of these steps or the module structure of the device is not limited to the execution order or module structure shown in the description of the embodiments of this application and the drawings.
  • the described method or module structure is applied to an actual device or terminal product, it can be executed sequentially or in parallel according to the method or module structure connection shown in the embodiments or drawings (for example, parallel processors or multi-threaded processing Environment, even distributed processing environment).
  • a method for selecting a client to generate a key for a multi-client server may include the following steps:
  • Step 201 A first client generates a complete target private key, and generates a target public key according to the target private key, where the first client is one of the N clients;
  • the aforementioned client is a key user, including but not limited to App, application server, etc.
  • the specific form of the client can be selected according to actual needs, and this application does not limit this.
  • the above-mentioned key server is a key service party and is used to provide key related services.
  • client 1 if client 1 is selected as the first client, then client 1 generates a complete private key SK, and generates a related public key PK based on the private key SK.
  • Step 202 The first client splits the target private key into 2N key components, and generates a public key component for each key component in the 2N private key to obtain 2N public key components;
  • the private key SK can be split into 2n parts: SK1 ⁇ SK2n, and PK1 ⁇ PK2n can be generated through SK1 ⁇ SK2n, and SKn+1, PK can be stored.
  • a secret sharing (key sharing) mechanism may be used for splitting, or other methods may be used for splitting, as long as the private key can be split effectively.
  • Step 203 The first client sends 2N key components, 2N public key components and the target public key in a one-to-one correspondence to N via the secure channel established between the client and the key server Client and N key servers.
  • Client 1 sends corresponding components to key server 1 ⁇ n and client 2 ⁇ n respectively, such as: sending SK1, PK1, PK to key server 1; sending SK2, PK2, PK to key server 2; By analogy, send SKn, PKn, and PK to key server n.
  • the corresponding components are delivered to clients 2 to n, such as: SKn+2, PKn+2, PK to client 2; and so on, SK2n, PK2n, PK to client n.
  • the client can issue the key component through a secure channel, where the client and the key server can establish a secure channel through KYC (Know your customer, identity confirmation procedure), where the identity confirmation procedure can include but Not limited to at least one of the following: SMS, email verification code, account password, fingerprint, face, certificate, etc.
  • KYC Know your customer, identity confirmation procedure
  • the identity confirmation procedure can include but Not limited to at least one of the following: SMS, email verification code, account password, fingerprint, face, certificate, etc.
  • the key component After the key component is generated and distributed, the key component can be used to sign, and the key component can be restored and refreshed.
  • Secure Multi-Party Computation Secure Multi-Party Computation
  • two-party MPC that is, the key server and The client selects two MPC participants to participate in the MPC calculation.
  • MPC is how two millionaires can compare who is richer without revealing their true property status without a trusted third party.
  • MPC can ensure the data security of all parties, and at the same time, jointly use the data of all parties to achieve specific effects, so as to give full play to the value of data.
  • Multiple participants holding their own private data jointly execute a calculation logic calculation logic (such as a maximum value calculation) and obtain the calculation result.
  • MPC calculation can design the protocol without relying on a trusted third party.
  • Secure multi-party computing can be abstractly understood as: two parties have their own private data, and can calculate the result of the public function without leaking their private data. When the entire calculation is completed, only the calculation result is known to both parties, and neither party knows the other's data and the intermediate data of the calculation process.
  • S1 The first client initiates a signature request, where the signature request carries data to be signed;
  • a random selection method can be used, or a selection method according to a preset algorithm, etc., which method is used to select the MPC calculation party can be determined according to actual needs and circumstances. Not limited.
  • Each of the N clients and the N key servers except the MPC calculating party splits their corresponding key components into a first subkey and a second subkey , And transmit the first subkey to the first device in the MPC calculation party through the secure channel, and transmit the second subkey to the second device in the MPC calculation party;
  • S4 The first device and the second device initiate MPC calculations through the secure channel, and sign the data to be signed to obtain a signature file;
  • S5 Send the signature file to each of the N clients and the N key servers except the MPC computing party.
  • S1 The first client initiates a key refresh request
  • Each of the N clients and the N key servers except the MPC computing party splits their corresponding key components into a first subkey and a second subkey , And transmit the first subkey to the first device in the MPC calculation party through the secure channel, and transmit the second subkey to the second device in the MPC calculation party;
  • S3 The first device and the second device initiate MPC calculations through the secure channel to obtain 2N refresh key components split based on the target private key, and sign the 2N refresh key components to obtain 2N signatures file;
  • S4 Send the corresponding 2N signature files in the 2N refresh key components to N clients and N key servers in a one-to-one correspondence;
  • N clients and N key servers verify the correctness of the received refresh key components by receiving the signature file, and if the verification is passed, save the received refresh key components.
  • S1 The first client initiates a signature request, where the signature request carries the data to be signed and the target public key;
  • N clients and the N key servers initiate MPC calculations through the secure channel to perform a signature operation on the data to be signed to obtain a signature file, and verify the signature file according to the target public key The correctness.
  • S1 The first client initiates a key refresh request
  • N clients and the N key servers initiate MPC calculations through the secure channel to obtain 2N refresh key components split based on the target private key, and sign the 2N refresh key components to obtain 2N signed documents;
  • S3 Send the corresponding 2N signature files in the 2N refresh key components to N clients and N key servers in a one-to-one correspondence;
  • N clients and N key servers verify the correctness of the received signature file through the target public key, and if the verification passes, update and save the received refresh key component.
  • the first client obtains the backup of the target private key through a backup method, as a backup key;
  • S4 The N clients and the N key servers verify the validity of the received signature file through the stored target public key, and if the signature file is determined to be valid, update and save the received backup secret Key component.
  • a complete target private key can be generated at the first client, and the target public key can be generated according to the target private key, where: Before the first client is one of the N clients, the N clients and the N servers complete mutual authentication through an identity confirmation procedure, and issue authentication materials, wherein the authentication materials Used for authentication and establishing the secure channel. That is, the client and the key server complete mutual authentication and establish a secure channel through KYC.
  • a key management method is provided based on secure two-party calculation through a client to generate a key, and multiple servers to keep it, that is, a single client generates a private key and splits it into multiple components and distributes them separately
  • To multiple servers and multiple clients use multiple servers and multiple clients to calculate signatures through two-party MPC; refresh multiple server and multiple client components by backing up private keys, and refresh multiple through two-party MPC Server and multiple client components.
  • S1 The client and the key server complete two-way authentication through KYC, and issue authentication materials to complete the registration process;
  • S2 Client 1 generates a complete private key SK, and generates a related public key PK based on the private key SK. Split the private key SK into 2n parts through secret sharing: SK1 ⁇ SK2n, and generate PK1 ⁇ PK2n through SK1 ⁇ SK2n, and save SKn+1, PK;
  • S1 The client initiates a signature request and provides the public key PK as the unique identifier and the data to be signed;
  • S2 The server selects two clients or key servers as MPC calculating parties.
  • key server 1 and key server 2 are selected as MPC calculating parties;
  • Clients 1 ⁇ n and key servers 1 ⁇ n complete two-way authentication through KYC and establish a secure channel, then split SK3 into SK3-1 and SK3-2, and pass SK3-1 to key server 1, SK3-2 is passed to key server 2; and so on, SK2n is split into (SK2n)-1 and (SK2n)-2, and (SK2n)-1 is passed to key server 1, and (SK2n)-2 is passed to Key server 2;
  • the key servers 1 and 2 initiate MPC calculations through the secure channel: calculate the private key SK through the key components SK1, SK2, (SK3 ⁇ 2n)-1, (SK3 ⁇ 2n)-2, and treat them through the private key SK Sign the signature data. And return the signature to the client and the key server. Because the entire process is a complete MPC calculation, the private key SK has not actually been generated (either during the calculation process or during use), and SK1 ⁇ 2n did not appear in the calculation interaction process (that is, not in the network Layer transmission SK1 ⁇ 2n are used for calculation).
  • the key or key component can be stored in one of the following forms, but not limited to:
  • Database Save the key or key component through the database, where the key or key component can be encrypted and stored;
  • Key file save the key or key component by exporting the key file, where the key or key component can be encrypted and stored;
  • HSM Save the key or key component through the hardware security module, where the key or key component can be encrypted and stored;
  • Mnemonic Convert the key and the key component to generate a series of mnemonics for storage
  • Two-dimensional code The corresponding two-dimensional code is generated by the key or key component for storage, where the key or key component can be encrypted and stored;
  • the client 1 directly backs up the private key SK during the process of generating the private key SK.
  • S1 Obtain the backup key through the backup method, and split the backup key SK into 2n key components through secret sharing. Use the private key SK to sign 1 to 2n key components respectively to obtain signatures S1 to S2n;
  • the client and the key server complete two-way authentication through KYC and establish a secure channel.
  • the client 1 respectively delivers corresponding components to the key server 1 ⁇ n and the client 2 ⁇ n, for example: SK1, S1 to Key server 1; send SK2, S2 to key server 2; and so on, send SKn, Sn to key server n, and send SKn+2, Sn+2 to client 2 to client 2 ⁇ n ; And so on, sending SK2n and SK2n to client n.
  • S3 The client and the key server respectively verify the validity of the received signature file S (S1 ⁇ S2n) through the previously stored public key PK. If the verification is passed, the received key components (SK1 ⁇ SK2n) are paired The key component is updated and saved.
  • S2 The client and the server select two clients or key servers as MPC calculating parties.
  • key server 1 and key server 2 are selected as MPC calculating parties;
  • Clients 1 ⁇ n and key servers 1 ⁇ n complete two-way authentication through KYC and establish a secure channel, then split SK3 into SK3-1 and SK3-2, and pass SK3-1 to key server 1, SK3-2 is passed to key server 2; and so on, SK2n is split into (SK2n)-1 and (SK2n)-2, and (SK2n)-1 is passed to key server 1, and (SK2n)-2 is passed to Key server 2.
  • the key servers 1 and 2 initiate MPC calculation through the secure channel: calculate the private key SK through the key components SK1, SK2, (SK3 ⁇ 2n)-1, (SK3 ⁇ 2n)-2, and perform the calculation through the private key SK Secret sharing generates new SK1 ⁇ 2n. And sign the new SK1 ⁇ 2n, and send SK1 ⁇ SK2n and their signatures to the corresponding key server and client respectively. Because the entire process is a complete MPC calculation, the private key SK has not actually been generated (whether in the calculation process or in the use process), and SK1 ⁇ 2n did not appear in the calculation interaction process (that is, not in the network Layer transmission SK1 ⁇ 2n are used for calculation).
  • a key management method is provided based on secure multi-party calculation that generates a key through a client and is kept by multiple servers. That is, a single client generates a private key and splits it into multiple components and distributes them at most Multiple clients and multiple key servers are used to calculate signatures using multiple clients and multiple key servers through MPC, multiple clients and multiple key server components are refreshed by backing up private keys, and multiple clients are refreshed through MPC With multiple key server components.
  • S1 The client and the key server complete two-way authentication through KYC, and issue authentication materials to complete the registration process;
  • S2 Client 1 generates a complete private key SK, and generates a related public key PK based on the private key SK. Split the private key SK into 2n copies through secret sharing: SK1 ⁇ SK2n, save SKn+1, PK;
  • Client 1 respectively delivers corresponding components to key servers 1 to n, for example: delivers SK1, PK1, PK to key server 1; delivers SK2, PK2, PK to key server 2; and so on, delivers SKn, PKn, PK to key server n.
  • the corresponding components are delivered to clients 2 to n, for example: SKn+2, PKn+2, PK are delivered to client 2; and so on, SK2n, PK2n, and PK are delivered to client n.
  • Client 1 initiates a signature request and provides the public key PK as a unique identifier and data to be signed;
  • S3 All clients and key servers initiate MPC calculations through a secure channel: perform a signature operation on the data to be signed, and verify the correctness of the signature through the PK public key.
  • the key or key component can be stored in one of the following forms, but not limited to:
  • Database Save the key or key component through the database, where the key or key component can be encrypted and stored;
  • Key file save the key or key component by exporting the key file, where the key or key component can be encrypted and stored;
  • HSM Save the key or key component through the hardware security module, where the key or key component can be encrypted and stored;
  • Mnemonic Convert the key and the key component to generate a series of mnemonics for storage
  • Two-dimensional code The corresponding two-dimensional code is generated by the key or key component for storage, where the key or key component can be encrypted and stored.
  • the client 1 In the process of generating the private key SK, the client 1 directly backs up the private key SK.
  • Client 1 obtains the backup key through the backup method, splits the backup key SK into 2n key components through secret sharing, and saves the n+1th share, and uses the private key SK to separately perform the 2n key components Sign, get signatures S1 ⁇ S2n;
  • S2 The client and the key server complete mutual authentication and establish a secure channel through KYC, and the client 1 respectively delivers corresponding components to the key servers 1 to n, for example: delivers SK1 and S1 to key server 1; delivers SK2 , S2 to key server 2; and so on, issue SKn, Sn to key server n.
  • Send corresponding components to clients 2 ⁇ n for example: send SKn+2, Sn+2 to client 2; and so on, send SK2n, S2n to client n;
  • Each client and the key server respectively verify the validity of the signature through the previously stored public key PK, and if the verification is passed, the key component is updated and saved.
  • Each client and the key server complete two-way authentication through KYC and establish a secure channel, and initiate MPC calculation: generate a private key SK, and generate SK1 ⁇ SK2n through the secret sharing algorithm, and use SK to sign SK1 ⁇ SK2n to generate a signature S1 ⁇ S2n.
  • Send the signatures to different key servers such as: send SK1 and S1 to key server 1; send SK2 and S2 to key server 2; and so on, send SKn and Sn to key server n .
  • Send the signatures to different clients such as: send SKn+1, Sn+1 to client 1; send SKn+2, Sn+2 to client 2; and so on, send SK2n, S2n To client n. Because the whole process is a complete MPC calculation, the private key SK has not actually been generated (either during the calculation process or during use).
  • Each client and key server verify the validity of the signature through the previously stored public key PK, and if it is valid, update and save the key component.
  • FIG. 12 is a hardware structure block diagram of a computer terminal in a method for selecting a client to generate a key for a multiple client server according to an embodiment of the present invention.
  • the computer terminal 10 may include one or more (only one is shown in the figure) processor 102 (the processor 102 may include, but is not limited to, a processing device such as a microprocessor MCU or a programmable logic device FPGA) , A memory 104 for storing data, and a transmission module 106 for communication functions.
  • FIG. 12 is only for illustration, and does not limit the structure of the above electronic device.
  • the computer terminal 10 may also include more or fewer components than those shown in FIG. 12, or have a different configuration from that shown in FIG.
  • the memory 104 may be used to store software programs and modules of application software, such as program instructions/modules corresponding to the method for selecting a client to generate a key for a multi-client server in the embodiment of the present invention, and the processor 102 is stored in the memory 104 by running The software programs and modules within, thereby executing various functional applications and data processing, that is, realizing the method of generating keys for multiple client servers by selecting a client of the above-mentioned application.
  • the memory 104 may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory.
  • the memory 104 may further include a memory remotely provided with respect to the processor 102, and these remote memories may be connected to the computer terminal 10 via a network.
  • networks include but are not limited to the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.
  • the transmission module 106 is used to receive or send data via a network.
  • the above-mentioned specific examples of the network may include a wireless network provided by the communication provider of the computer terminal 10.
  • the transmission module 106 includes a network adapter (Network Interface Controller, NIC), which can be connected to other network devices through a base station so as to communicate with the Internet.
  • the transmission module 106 may be a radio frequency (RF) module, which is used to communicate with the Internet in a wireless manner.
  • RF radio frequency
  • the above-mentioned means for selecting a client to generate a key for a multi-client server may include:
  • a generating module used to generate a complete target private key, and generate a target public key according to the target private key
  • a splitting module configured to split the target private key into 2N key components, and generate a public key component for each key component in the 2N private key to obtain 2N public key components;
  • the issuing module is used to send 2N key components, 2N public key components, and the target public key to N clients in a one-to-one correspondence through the secure channel established between the client and the key server.
  • the embodiment of the present application also provides a specific implementation of an electronic device that can implement all the steps in the method for selecting a client to generate a key for a multi-client server in the foregoing embodiment, and the electronic device specifically includes the following content: A processor, a memory, a communication interface (Communications Interface), and a bus; wherein the processor, memory, and communication interface communicate with each other through the bus; the processor is used to call the memory
  • the processor executes the computer program
  • the processor implements all the steps in the method for selecting a client to generate a key for a multiple client server in the foregoing embodiment.
  • the processor executes the computer
  • the following steps are implemented in the program:
  • Step 1 The first client generates a complete target private key, and generates a target public key according to the target private key, where the first client is one of the N clients;
  • Step 2 The first client splits the target private key into 2N key components, and generates a public key component for each key component in the 2N private key to obtain 2N public key components ;
  • Step 3 The first client sends 2N key components, 2N public key components, and the target public key in a one-to-one correspondence to N via the secure channel established between the client and the key server Client and N key servers.
  • the key management system includes: multiple clients and multiple key servers.
  • One of the clients generates a complete target private key and target public key, and then splits them to obtain multiple key components and delivers them, one for each client and key server, thus realizing the generation of key components and public keys
  • the embodiment of the present application also provides a computer-readable storage medium capable of implementing all the steps in the method for selecting a client to generate a key for a multi-client server in the above-mentioned embodiment, and the computer-readable storage medium stores A computer program that, when executed by a processor, implements all the steps of the method for selecting a client to generate a key for a multiple client server in the above embodiment, for example, when the processor executes the computer program, the following is implemented step:
  • Step 1 The first client generates a complete target private key, and generates a target public key according to the target private key, where the first client is one of the N clients;
  • Step 2 The first client splits the target private key into 2N key components, and generates a public key component for each key component in the 2N private key to obtain 2N public key components ;
  • Step 3 The first client sends 2N key components, 2N public key components, and the target public key in a one-to-one correspondence to N via the secure channel established between the client and the key server Client and N key servers.
  • the key management system includes: multiple clients and multiple key servers.
  • One of the clients generates a complete target private key and target public key, and then splits them to obtain multiple key components and delivers them, one for each client and key server, thus realizing the generation of key components and public keys
  • a typical implementation device is a computer.
  • the computer may be, for example, a personal computer, a laptop computer, a vehicle-mounted human-computer interaction device, a cellular phone, a camera phone, a smart phone, a personal digital assistant, a media player, a navigation device, an email device, a game console, and a tablet.
  • Computers, wearable devices, or any combination of these devices may be specifically implemented by computer chips or entities, or implemented by products with certain functions.
  • the computer may be, for example, a personal computer, a laptop computer, a vehicle-mounted human-computer interaction device, a cellular phone, a camera phone, a smart phone, a personal digital assistant, a media player, a navigation device, an email device, a game console, and a tablet.
  • each module can be implemented in the same one or more software and/or hardware, or a module that implements the same function can be implemented by a combination of multiple sub-modules or sub-units.
  • the device embodiments described above are merely illustrative, for example, the division of the units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components can be combined or integrated To another system, or some features can be ignored, or not implemented.
  • the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms.
  • controller in addition to implementing the controller in a purely computer-readable program code manner, it is entirely possible to program the method steps to make the controller use logic gates, switches, application specific integrated circuits, programmable logic controllers and embedded The same function can be realized in the form of a microcontroller, etc. Therefore, such a controller can be regarded as a hardware component, and the devices included in it for realizing various functions can also be regarded as a structure within the hardware component. Or even, the device for realizing various functions can be regarded as both a software module for realizing the method and a structure within a hardware component.
  • These computer program instructions can also be stored in a computer-readable memory that can guide a computer or other programmable data processing equipment to work in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture including the instruction device.
  • the device implements the functions specified in one process or multiple processes in the flowchart and/or one block or multiple blocks in the block diagram.
  • These computer program instructions can also be loaded on a computer or other programmable data processing equipment, so that a series of operation steps are executed on the computer or other programmable equipment to produce computer-implemented processing, so as to execute on the computer or other programmable equipment.
  • the instructions provide steps for implementing functions specified in a flow or multiple flows in the flowchart and/or a block or multiple blocks in the block diagram.
  • the computing device includes one or more processors (CPU), input/output interfaces, network interfaces, and memory.
  • processors CPU
  • input/output interfaces network interfaces
  • memory volatile and non-volatile memory
  • the memory may include non-permanent memory in computer readable media, random access memory (RAM) and/or non-volatile memory, such as read-only memory (ROM) or flash memory (flash RAM). Memory is an example of computer readable media.
  • RAM random access memory
  • ROM read-only memory
  • flash RAM flash memory
  • Computer-readable media include permanent and non-permanent, removable and non-removable media, and information storage can be realized by any method or technology.
  • the information can be computer readable instructions, data structures, program modules, or other data.
  • Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, CD-ROM, digital versatile disc (DVD) or other optical storage, Magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices or any other non-transmission media can be used to store information that can be accessed by computing devices. According to the definition in this article, computer-readable media does not include transitory media, such as modulated data signals and carrier waves.
  • the embodiments of this specification can be provided as methods, systems or computer program products. Therefore, the embodiments of this specification may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the embodiments of this specification may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.
  • a computer-usable storage media including but not limited to disk storage, CD-ROM, optical storage, etc.
  • program modules include routines, programs, objects, components, data structures, etc. that perform specific tasks or implement specific abstract data types.
  • the embodiments of this specification can also be practiced in distributed computing environments. In these distributed computing environments, tasks are performed by remote processing devices connected through a communication network. In a distributed computing environment, program modules can be located in local and remote computer storage media including storage devices.

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Abstract

本申请提供了一种择一客户端为多客户端多服务器生成密钥的方法和设备,应用于密钥管理系统,上述方法包括:第一客户端生成完整的目标私钥,并根据目标私钥生成目标公钥,其中,第一客户端为N个客户端中的一个客户端;第一客户端将目标私钥拆分为2N份密钥分量,并为2N份密钥私钥中各密钥分量生成公钥分量,得到2N份公钥分量;第一客户端通过客户端与密钥服务器之间建立的安全信道,将2N份密钥分量、2N份公钥分量和目标公钥,一一对应地下发至N个客户端和N个密钥服务器。通过上述方式解决了现有的密钥管理系统中所存在的安全性和灵活性较低的问题,达到了有效提升密钥管理系统安全性和灵活性的技术效果。

Description

择一客户端为多客户端多服务器生成密钥的方法和设备 技术领域
本申请属于信息安全技术领域,尤其涉及一种择一客户端为多客户端多服务器生成密钥的方法和设备。
背景技术
目前,针对密钥服务系统而言,一般都是由一个密钥服务器生成密钥,然后将生成的密钥分发给密钥使用方,这样势必会增加密钥服务器的负担,且因为是由单一密钥服务器生成的,导致所有的密钥生成规则都是密钥服务器自身指定和维护的,灵活性不高。
针对现有的密钥系统中所存在的上述问题,目前尚未提出有效的解决方案。
发明内容
本申请目的在于提供一种择一客户端为多客户端多服务器生成密钥的方法和设备,可以提升密钥管理的安全性和灵活性。
本申请提供一种择一客户端为多客户端多服务器生成密钥的方法和设备是这样实现的:
一方面,提供了一种择一客户端为多客户端服务器生成密钥的方法,应用于密钥管理系统,该密钥管理系统包括:N个客户端和N个密钥服务器,其中,N为大于等于2的正整数,所述方法包括:
第一客户端生成完整的目标私钥,并根据所述目标私钥生成目标公钥,其中,所述第一客户端为所述N个客户端中的一个客户端;
所述第一客户端将所述目标私钥拆分为2N份密钥分量,并为所述2N份密钥私钥中各密钥分量生成公钥分量,得到2N份公钥分量;
所述第一客户端通过客户端与密钥服务器之间建立的安全信道,将2N份密钥分量、2N份公钥分量和所述目标公钥,一一对应地下发至N个客户端和N个密钥服务器。
在一个实施方式中,在将2N份密钥分量、2N份公钥分量和所述目标公钥,一一对应地下发至N个客户端和N个密钥服务器之后,还包括;
所述第一客户端发起签名请求,其中,所述签名请求中携带有待签名数据;
从所述N个密钥服务器和所述N个客户端中选择两个设备作为MPC计算方;
所述N个客户端和所述N个密钥服务器中除MPC计算方之外的各个客户端和密钥 服务器将自身对应的密钥分量拆分为第一子密钥和第二子密钥,并通过所述安全信道将第一子密钥传送至MPC计算方中的第一设备,将第二子密钥传送至MPC计算方中的第二设备;
所述第一设备和所述第二设备通过所述安全信道发起MPC计算对所述待签名数据进行签名,得到签名文件;
将签名文件发送至所述N个客户端和所述N个密钥服务器中除MPC计算方之外的各个客户端和密钥服务器。
在一个实施方式中,在将2N份密钥分量、2N份公钥分量和所述目标公钥,一一对应地下发至N个客户端和N个密钥服务器之后,还包括;
所述第一客户端发起刷新密钥请求;
所述N个客户端和所述N个密钥服务器中除MPC计算方之外的各个客户端和密钥服务器将自身对应的密钥分量拆分为第一子密钥和第二子密钥,并通过所述安全信道将第一子密钥传送至MPC计算方中的第一设备,将第二子密钥传送至MPC计算方中的第二设备;
所述第一设备和所述第二设备通过所述安全信道发起MPC计算得到基于目标私钥拆分的2N份刷新密钥分量,对所述2N份刷新密钥分量进行签名,得到2N份签名文件;
将所述2N份刷新密钥分量中对应的2N份签名文件,一一对应地下发至N个客户端和N个密钥服务器;
所述N个客户端和N个密钥服务器通过接收到签名文件验证接收到的刷新密钥分量的正确性,在验证通过的情况下,保存接收到的刷新密钥分量。
在一个实施方式中,在将2N份密钥分量、2N份公钥分量和所述目标公钥,一一对应地下发至N个客户端和N个密钥服务器之后,还包括;
所述第一客户端发起签名请求,其中,所述签名请求中携带有待签名数据和所述目标公钥;
所述N个客户端和所述N个密钥服务器通过所述安全信道发起MPC计算,以对所述待签名数据进行签名操作,得到签名文件,并根据所述目标公钥验证所述签名文件的正确性。
在一个实施方式中,在将2N份密钥分量、2N份公钥分量和所述目标公钥,一一对应地下发至N个客户端和N个密钥服务器之后,还包括;
所述第一客户端发起刷新密钥请求;
所述N个客户端和所述N个密钥服务器通过所述安全信道发起MPC计算得到基于目标私钥拆分的2N份刷新密钥分量,对所述2N份刷新密钥分量进行签名,得到2N份签名文件;
将所述2N份刷新密钥分量中对应的2N份签名文件,一一对应地下发至N个客户端和N个密钥服务器;
所述N个客户端和N个密钥服务器通过所述目标公钥验证接收到的签名文件的正确性,在验证通过的情况下,更新并保存接收到的刷新密钥分量。
在一个实施方式中,在将2N份密钥分量、2N份公钥分量和所述目标公钥,一一对应地下发至N个客户端和N个密钥服务器之后,还包括;
所述第一客户端通过备份方式获取所述目标私钥的备份,作为备份密钥;
所述第一客户端将所述备份密钥拆分为2N份备份密钥分量,并通过所述目标私钥对所述2N份备份密钥分量进行签名,得到2N份签名文件;
所述第一客户端通过所述安全信道,将所述2N份备份密钥分量和所述2N份签名文件,一一对应地下发至所述N个客户端和N个密钥服务器;
所述N个客户端和所述N个密钥服务器通过存储的所述目标公钥,验证接收到的签名文件的有效性,在确定签名文件有效的情况下,更新并保存接收到的备份密钥分量。
在一个实施方式中,在第一客户端生成完整的目标私钥,并根据所述目标私钥生成目标公钥,其中,所述第一客户端为所述N个客户端中的一个客户端之后,还包括:
所述N个客户端和所述N个服务器之间通过确认身份程序完成双向认证,并下发认证材料,其中,所述认证材料用于鉴权并建立所述安全通道。
在一个实施方式中,所述确认身份程序包括以下至少之一:短信、验证码、账号密钥、指纹、人脸、证书。
另一方面,提供了一种终端设备,包括处理器以及用于存储处理器可执行指令的存储器,所述处理器执行所述指令时实现如下方法的步骤:
第一客户端生成完整的目标私钥,并根据所述目标私钥生成目标公钥,其中,所述第一客户端为所述N个客户端中的一个客户端;
所述第一客户端将所述目标私钥拆分为2N份密钥分量,并为所述2N份密钥私钥中各密钥分量生成公钥分量,得到2N份公钥分量;
所述第一客户端通过客户端与密钥服务器之间建立的安全信道,将2N份密钥分量、2N份公钥分量和所述目标公钥,一一对应地下发至N个客户端和N个密钥服务器。
又一方面,提供了一种计算机可读存储介质,其上存储有计算机指令,所述指令被执行时实现如下方法的步骤:
第一客户端生成完整的目标私钥,并根据所述目标私钥生成目标公钥,其中,所述第一客户端为所述N个客户端中的一个客户端;
所述第一客户端将所述目标私钥拆分为2N份密钥分量,并为所述2N份密钥私钥中各密钥分量生成公钥分量,得到2N份公钥分量;
所述第一客户端通过客户端与密钥服务器之间建立的安全信道,将2N份密钥分量、2N份公钥分量和所述目标公钥,一一对应地下发至N个客户端和N个密钥服务器。
本申请提供的择一客户端为多客户端服务器生成密钥的方法,应用于密钥管理系统,该密钥管理系统包括:多个客户端和多个密钥服务器,由其中一个客户端生成完整的目标私钥和目标公钥,然后拆分得到多份密钥分量并下发,每个客户端和密钥服务器一份,从而实现了密钥分量和公钥的生成,通过上述方式解决了现有的密钥管理系统中所存在的安全性和灵活性较低的问题,达到了有效提升密钥管理系统安全性和灵活性的技术效果。
附图说明
为了更清楚地说明本申请实施例或现有技术中的技术方案,下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍,显而易见地,下面描述中的附图仅仅是本申请中记载的一些实施例,对于本领域普通技术人员来讲,在不付出创造性劳动性的前提下,还可以根据这些附图获得其他的附图。
图1是本申请提供的密钥系统的架构图;
图2是本申请提供的择一客户端为多客户端服务器生成密钥的方法的方法流程图;
图3是本申请提供的实例1的密钥生成的交互示意图;
图4是本申请提供的实例1的密钥使用的交互示意图;
图5是本申请提供的实例1的密钥备份的交互示意图;
图6是本申请提供的实例1的密钥恢复的交互示意图;
图7是本申请提供的实例1的密钥刷新的交互示意图;
图8是本申请提供的实例2的密钥生成的交互示意图;
图9是本申请提供的实例2的密钥使用的交互示意图;
图10是本申请提供的实例2的密钥恢复的交互示意图;
图11是本申请提供的实例2的密钥刷新的交互示意图;
图12是本申请提供的计算机终端的结构示意图。
具体实施方式
为了使本技术领域的人员更好地理解本申请中的技术方案,下面将结合本申请实施例中的附图,对本申请实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本申请一部分实施例,而不是全部的实施例。基于本申请中的实施例,本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例,都应当属于本申请保护的范围。
考虑到现有的是由单一密钥服务器单方面生成密钥,导致灵活性和安全性较低的问题,在本例中,通过密钥管理系统中的多个客户端中的一个客户端为多个客户端和多个密钥服务器生成私钥和公钥,然后拆分为多个密钥分量之后分发给各个密钥服务器,在使用的时候,客户端和密钥服务器使用这些密钥分量进行签名、更新等操作,从而可以提升密钥生成的灵活性和密钥的安全性。
在本例中所提供的单一客户端生成私钥的密钥管理方法,应用于密钥系统中,如图1所示,该密钥系统包括:N个客户端和N个密钥服务器,其中,N为大于等于2的整数。
图2是本申请所述一种择一客户端为多客户端服务器生成密钥的方法一个实施例的方法流程图。虽然本申请提供了如下述实施例或附图所示的方法操作步骤或装置结构,但基于常规或者无需创造性的劳动在所述方法或装置中可以包括更多或者更少的操作步骤或模块单元。在逻辑性上不存在必要因果关系的步骤或结构中,这些步骤的执行顺序或装置的模块结构不限于本申请实施例描述及附图所示的执行顺序或模块结构。所述的方法或模块结构的在实际中的装置或终端产品应用时,可以按照实施例或者附图所示的方法或模块结构连接进行顺序执行或者并行执行(例如并行处理器或者多线程处理的环境,甚至分布式处理环境)。
具体的如图2所示,本申请一种实施例提供的一种择一客户端为多客户端服务器生成密钥的方法可以包括如下步骤:
步骤201:第一客户端生成完整的目标私钥,并根据所述目标私钥生成目标公钥,其中,所述第一客户端为所述N个客户端中的一个客户端;
其中,上述的客户端为密钥使用方,包括但不限于App、应用服务器等,客户端具 体以哪种形式存在可以根据实际需要选择,本申请对此不作限定。上述的密钥服务器为密钥服务方,用于提供密钥相关服务。
具体的,例如选择客户端1作为第一客户端,那么客户端1生成完整私钥SK,并基于私钥SK生成相关公钥PK。
步骤202:第一客户端将所述目标私钥拆分为2N份密钥分量,并为所述2N份密钥私钥中各密钥分量生成公钥分量,得到2N份公钥分量;
例如,可以将私钥SK拆分成2n份:SK1~SK2n,并通过SK1~SK2n生成PK1~PK2n,保存SKn+1、PK。具体的,可以采用secret sharing(密钥共享)机制进行拆分,也可以采用其它的方式进行拆分,只要能实现私钥的有效拆分的方式都可以。
步骤203:所述第一客户端通过客户端与密钥服务器之间建立的安全信道,将2N份密钥分量、2N份公钥分量和所述目标公钥,一一对应地下发至N个客户端和N个密钥服务器。
例如:客户端1分别向密钥服务器1~n和客户端2~n下发对应分量,如:下发SK1、PK1、PK至密钥服务器1;下发SK2、PK2、PK至密钥服务器2;以此类推,下发SKn、PKn、PK至密钥服务器n。向客户端2~n下发对应分量,如:下发SKn+2、PKn+2、PK至客户端2;以此类推,下发SK2n、PK2n、PK至客户端n。
具体的,客户端可以通过安全信道下发密钥分量,其中,客户端与密钥服务器之间可以通过KYC(Know your customer,确认身份程序)来建立安全通道,其中,确认身份程序可以包括但不限于以下至少之一:手机短信、邮箱验证码、账号密码、指纹、人脸、证书等。
在生成并分发密钥分量之后,可以通过密钥分量进行签名,以及对密钥分量进行恢复和刷新等操作。在进行这些操作的时候,可以通过多方(Secure Multi-Party Computation,安全多方计算),即,所有的密钥服务器和客户端都参与MPC计算,也可以通过两方MPC,即,密钥服务器和客户端中选择两个MPC参与方参与MPC计算。
其中,MPC是在没有可信第三方的前提下,两个百万富翁如何不泄露自己的真实财产状况来比较谁更有钱。MPC可以在保证各方数据安全的同时,联合使用各方数据来达到特定的效果,从而充分发挥数据的价值。多个持有各自私有数据的参与方,共同执行一个计算逻辑计算逻辑(如,求最大值计算),并获得计算结果。但过程中,参与的每一方均不会泄漏各自数据的计算,被称之为MPC计算,MPC计算可以通过对协议的设计而不用依赖于可信第三方。安全多方计算可以抽象的理解为:两方分别拥有各自的私有 数据,在不泄漏各自私有数据的情况下,能够计算出关于公共函数的结果。整个计算完成时,只有计算结果对双方可知,且双方均不知对方的数据以及计算过程的中间数据。
下面对这两种MPC计算模式下的密钥分量的使用进行说明如下:
1)两方MPC:
在使用密钥分量对待签名数据进行签名的时候,可以包括如下步骤:
S1:第一客户端发起签名请求,其中,所述签名请求中携带有待签名数据;
S2:从所述N个密钥服务器和所述N个客户端中选择两个设备作为MPC计算方;
具体的,在选取MPC计算方的时候可以采用随机选取的方式,也可以是按照预设算法等选择的方式,具体采用哪种方式选取MPC计算方可以根据实际需要和情况确定,本申请对此不作限定。
S3:N个客户端和所述N个密钥服务器中除MPC计算方之外的各个客户端和密钥服务器将自身对应的密钥分量拆分为第一子密钥和第二子密钥,并通过所述安全信道将第一子密钥传送至MPC计算方中的第一设备,将第二子密钥传送至MPC计算方中的第二设备;
S4:第一设备和所述第二设备通过所述安全信道发起MPC计算,对所述待签名数据进行签名,得到签名文件;
S5:将签名文件发送至所述N个客户端和所述N个密钥服务器中除MPC计算方之外的各个客户端和密钥服务器。
在刷新密钥分量的时候,可以包括如下步骤:
S1:第一客户端发起刷新密钥请求;
S2:N个客户端和所述N个密钥服务器中除MPC计算方之外的各个客户端和密钥服务器将自身对应的密钥分量拆分为第一子密钥和第二子密钥,并通过所述安全信道将第一子密钥传送至MPC计算方中的第一设备,将第二子密钥传送至MPC计算方中的第二设备;
S3:第一设备和所述第二设备通过所述安全信道发起MPC计算得到基于目标私钥拆分的2N份刷新密钥分量,对所述2N份刷新密钥分量进行签名,得到2N份签名文件;
S4:将所述2N份刷新密钥分量中对应的2N份签名文件,一一对应地下发至N个客户端和N个密钥服务器;
S5:N个客户端和N个密钥服务器通过接收到签名文件验证接收到的刷新密钥分量的正确性,在验证通过的情况下,保存接收到的刷新密钥分量。
2)多方MPC:
在使用密钥分量对待签名数据进行签名的时候,可以包括如下步骤:
S1:第一客户端发起签名请求,其中,所述签名请求中携带有待签名数据和所述目标公钥;
S2:N个客户端和所述N个密钥服务器通过所述安全信道发起MPC计算,以对所述待签名数据进行签名操作,得到签名文件,并根据所述目标公钥验证所述签名文件的正确性。
在刷新密钥分量的时候,可以包括如下步骤:
S1:第一客户端发起刷新密钥请求;
S2:N个客户端和所述N个密钥服务器通过所述安全信道发起MPC计算得到基于目标私钥拆分的2N份刷新密钥分量,对所述2N份刷新密钥分量进行签名,得到2N份签名文件;
S3:将所述2N份刷新密钥分量中对应的2N份签名文件,一一对应地下发至N个客户端和N个密钥服务器;
S4:N个客户端和N个密钥服务器通过所述目标公钥验证接收到的签名文件的正确性,在验证通过的情况下,更新并保存接收到的刷新密钥分量。
在进行备份恢复的时候,不需要用到MPC计算,仅基于安全信道即可实现备份恢复,具体的,为了实现备份恢复,在将2N份密钥分量、2N份公钥分量和所述目标公钥,一一对应地下发至N个客户端和N个密钥服务器之后,还可以包括;
S1:第一客户端通过备份方式获取所述目标私钥的备份,作为备份密钥;
S2:第一客户端将所述备份密钥拆分为2N份备份密钥分量,并通过所述目标私钥对所述2N份备份密钥分量进行签名,得到2N份签名文件;
S3:第一客户端通过所述安全信道,将所述2N份备份密钥分量和所述2N份签名文件,一一对应地下发至所述N个客户端和N个密钥服务器;
S4:N个客户端和所述N个密钥服务器通过存储的所述目标公钥,验证接收到的签名文件的有效性,在确定签名文件有效的情况下,更新并保存接收到的备份密钥分量。
为了建立上述的安全信道,以保证客户端与密钥服务器之间数据传输的安全性,可以在第一客户端生成完整的目标私钥,并根据所述目标私钥生成目标公钥,其中,所述第一客户端为所述N个客户端中的一个客户端之前,N个客户端和所述N个服务器之间通过确认身份程序完成双向认证,并下发认证材料,其中,认证材料用于鉴权并建立所 述安全通道。即,客户端与密钥服务器之间通过KYC完成双向认证并建立安全通道。
下面结合几个具体实例对上述方法进行说明,然而,值得注意的是,这几个具体实例仅是为了更好地说明本申请,并不构成对本申请的不当限定。
实例1:
在本例中,提供了一种基于安全两方计算通过客户端生成密钥,多个服务端保管的密钥管理方法,即,单客户端生成私钥并拆分成多个分量分别下发至多个服务端与多个客户端,通过两方MPC使用多个服务端与多个客户端计算签名;通过备份私钥刷新多个服务端与多个客户端分量,通过两方MPC刷新多个服务端与多个客户端分量。
对这种情境下的密钥生成、使用、存储、备份、恢复、刷新等操作说明如下:
1)生成:
如图3所示,可以包括如下步骤:
S1:客户端与密钥服务器通过KYC完成双向认证,并下发认证材料完成注册流程;
S2:客户端1生成完整私钥SK,并基于私钥SK生成相关公钥PK。通过secret sharing将私钥SK拆分成2n份:SK1~SK2n,并通过SK1~SK2n生成PK1~PK2n,保存SKn+1、PK;
S3:客户端与密钥服务器通过下发的认证材料鉴权并建立安全信道。客户端1分别向密钥服务器1~n和客户端2~n下发对应分量,例如:下发SK1、PK1、PK至密钥服务器1;下发SK2、PK2、PK至密钥服务器2;以此类推,下发SKn、PKn、PK至密钥服务器n,下发SKn+2、PKn+2、PK至客户端2;以此类推,下发SK2n、PK2n、PK至客户端n。
S4:客户端2~n、密钥服务器1~n分别保存自己的密钥分量,完成密钥生成流程。
2)使用:
如图4所示,可以包括如下步骤:
S1:客户端发起签名请求,并提供公钥PK作为唯一标识以及待签名数据;
S2:服务端选择两个客户端或密钥服务器作为MPC计算方,在本例中,假设选择密钥服务器1和密钥服务器2作为MPC计算方;
S3:客户端1~n、密钥服务器1~n通过KYC完成双向认证并建立安全信道,然后,将SK3拆分成SK3-1、SK3-2,将SK3-1传给密钥服务器1、SK3-2传给密钥服务器2;以此类推,SK2n拆分成(SK2n)-1、(SK2n)-2,将(SK2n)-1传给密钥服务器1、(SK2n)-2 传给密钥服务器2;
S4:密钥服务器1、2通过安全信道发起MPC计算:通过密钥分量SK1、SK2、(SK3~2n)-1、(SK3~2n)-2计算出私钥SK,并通过私钥SK对待签名数据进行签名。并将签名返回给客户端与密钥服务器。因为整个过程是完整的MPC计算,因此,私钥SK实际上并没有真正生成过(不管是计算过程中,还是使用过程中),SK1~2n均没有在计算交互过程中出现(即没有在网络层传输SK1~2n用于计算)。
3)存储:
密钥或密钥分量可以通过但不限于采用以下形式之一进行保存:
数据库:通过数据库保存密钥或密钥分量,其中密钥或密钥分量可以加密保存;
密钥文件:通过导出密钥文件形式保存密钥或密钥分量,其中密钥或密钥分量可以加密保存;
HSM:通过硬件安全模块保存密钥或密钥分量,其中密钥或密钥分量可以加密保存;
助记词:将密钥活密钥分量通过转换生成一系列助记词进行保存;
二维码:通过密钥或密钥分量生成对应二维码进行保存,其中密钥或密钥分量可以加密保存;
4)备份:
如图5所示,客户端1在生成私钥SK的过程中,直接对私钥SK进行备份保存。
5)恢复:
如图6所示,可以包括如下步骤:
S1:通过备份方式获取备份密钥,通过secret sharing将备份密钥SK拆分成2n份密钥分量。使用私钥SK对1~2n份密钥分量分别进行签名,得到签名S1~S2n;
S2:客户端与密钥服务器之间通过KYC完成双向认证并建立安全信道,客户端1分别向密钥服务器1~n和客户端2~n下发对应分量,例如:下发SK1、S1至密钥服务器1;下发SK2、S2至密钥服务器2;以此类推,下发SKn、Sn至密钥服务器n,向客户端2~n下发SKn+2、Sn+2至客户端2;以此类推,下发SK2n、SK2n至客户端n。
S3:客户端和密钥服务器分别通过之前存储的公钥PK验证接收到的签名文件S(S1~S2n)的有效性,若验证通过,则通过接收到的密钥分量(SK1~SK2n)对密钥分量进行更新并保存。
6)刷新:
如图7所示,可以包括如下步骤:
S1:客户端1发起刷新密钥请求;
S2:客户端、服务端选择两个客户端或密钥服务器作为MPC计算方,在本例中,假设选择密钥服务器1和密钥服务器2作为MPC计算方;
S3:客户端1~n、密钥服务器1~n通过KYC完成双向认证并建立安全信道,然后,将SK3拆分成SK3-1、SK3-2,将SK3-1传给密钥服务器1、SK3-2传给密钥服务器2;以此类推,SK2n拆分成(SK2n)-1、(SK2n)-2,将(SK2n)-1传给密钥服务器1、(SK2n)-2传给密钥服务器2。
S4:密钥服务器1、2通过安全信道发起MPC计算:通过密钥分量SK1、SK2、(SK3~2n)-1、(SK3~2n)-2计算出私钥SK,并通过私钥SK进行secret sharing生成新的SK1~2n。并将新的SK1~2n进行签名,将SK1~SK2n及其签名分别下发给对应,密钥服务器和客户端。因为整个过程是完整的MPC计算,因此,私钥SK实际上并没有真正生成过(不管是计算过程中,还是使用过程中),SK1~2n均没有在计算交互过程中出现(即没有在网络层传输SK1~2n用于计算)。
S5:客户端、密钥服务器间收到相关信息后,通过收到的签名文件验证下发的密钥分量是否正确,在确定正确的情况下,保存相关信息。
实例2
在本例中,提供了一种基于安全多方计算通过客户端生成密钥,多个服务端保管的密钥管理方法,即,单个客户端生成私钥并拆分成多个分量分别下发至多个客户端与多个密钥服务器,通过MPC使用多个客户端与多个密钥服务器计算签名,通过备份私钥刷新多个客户端与多个密钥服务器分量,通过MPC刷新多个客户端与多个密钥服务器分量。
对这种情境下的密钥生成、使用、存储、备份、恢复、刷新等操作说明如下:
1)生成:
如图8所示,可以包括如下步骤:
S1:客户端与密钥服务器通过KYC完成双向认证,并下发认证材料完成注册流程;
S2:客户端1生成完整私钥SK,并基于私钥SK生成相关公钥PK。通过secret sharing将私钥SK拆分成2n份:SK1~SK2n,保存SKn+1、PK;
S3:客户端与服务端通过下发的认证材料鉴权并建立安全信道。客户端1分别向密钥服务器1~n下发对应分量,例如:下发SK1、PK1、PK至密钥服务器1;下发SK2、 PK2、PK至密钥服务器2;以此类推,下发SKn、PKn、PK至密钥服务器n。向客户端2~n下发对应分量,例如:下发SKn+2、PKn+2、PK至客户端2;以此类推,下发SK2n、PK2n、PK至客户端n。
S4:客户端2~n、密钥服务器1~n分别保存自己的密钥分量,完成密钥生成流程。
2)使用:
如图9所示,可以包括如下步骤:
S1:客户端1发起签名请求,并提供公钥PK作为唯一标识以及待签名数据;
S2:客户端与密钥服务器间通过KYC完成双向认证并建立安全信道;
S3:所有的客户端与密钥服务器通过安全信道发起MPC计算:对待签名数据进行签名操作,并通过PK公钥验证签名的正确性。
3)存储:
密钥或密钥分量可以通过但不限于以下形式之一保存:
数据库:通过数据库保存密钥或密钥分量,其中密钥或密钥分量可以加密保存;
密钥文件:通过导出密钥文件形式保存密钥或密钥分量,其中密钥或密钥分量可以加密保存;
HSM:通过硬件安全模块保存密钥或密钥分量,其中密钥或密钥分量可以加密保存;
助记词:将密钥活密钥分量通过转换生成一系列助记词进行保存;
二维码:通过密钥或密钥分量生成对应二维码进行保存,其中密钥或密钥分量可以加密保存。
4)备份:
客户端1在生成私钥SK生成过程中,直接对私钥SK进行备份保存。
5)恢复:
如图10所示,可以包括如下步骤:
S1:客户端1通过备份方式获取备份密钥,通过secret sharing将备份密钥SK拆分成2n份密钥分量,并保存第n+1份,使用私钥SK对2n份密钥分量分别进行签名,得到签名S1~S2n;
S2:客户端与密钥服务器通过KYC完成双向认证并建立安全信道,客户端1分别向密钥服务器1~n下发对应分量,例如:下发SK1、S1至密钥服务器1;下发SK2、S2至密钥服务器2;以此类推,下发SKn、Sn至密钥服务器n。向客户端2~n下发对应分量,例如:下发SKn+2、Sn+2至客户端2;以此类推,下发SK2n、S2n至客户端n;
S3:各个客户端和密钥服务器分别通过之前存储的公钥PK验证签名的有效性,若验证通过,则更新密钥分量并保存。
6)刷新:
如图11所示,可以包括如下步骤:
S1:客户端1发起刷新密钥请求;
S2:各个客户端与密钥服务器间通过KYC完成双向认证并建立安全信道,发起MPC计算:生成私钥SK,并通过secret sharing算法生成SK1~SK2n,使用SK对SK1~SK2n进行签名,生成签名S1~S2n。将签名分别下发给不同的密钥服务器,如:下发SK1、S1至密钥服务器1;下发SK2、S2至密钥服务器2;以此类推,下发SKn、Sn至密钥服务器n。将签名分别下发给不同的客户端,如:下发SKn+1、Sn+1至客户端1;下发SKn+2、Sn+2至客户端2;以此类推,下发SK2n、S2n至客户端n。因为整个过程是完整的MPC计算,因此,私钥SK实际上并没有真正生成过(不管是计算过程中,还是使用过程中)。
S3:各个客户端、密钥服务器通过之前存储的公钥PK验证签名有效性,若有效,则更新并保存密钥分量。
本申请上述实施例所提供的方法实施例可以在移动终端、计算机终端或者类似的运算装置中执行。以运行在计算机终端上为例,图12是本发明实施例的一种择一客户端为多客户端服务器生成密钥的方法的计算机终端的硬件结构框图。如图12所示,计算机终端10可以包括一个或多个(图中仅示出一个)处理器102(处理器102可以包括但不限于微处理器MCU或可编程逻辑器件FPGA等的处理装置)、用于存储数据的存储器104、以及用于通信功能的传输模块106。本领域普通技术人员可以理解,图12所示的结构仅为示意,其并不对上述电子装置的结构造成限定。例如,计算机终端10还可包括比图12中所示更多或者更少的组件,或者具有与图12所示不同的配置。
存储器104可用于存储应用软件的软件程序以及模块,如本发明实施例中的择一客户端为多客户端服务器生成密钥的方法对应的程序指令/模块,处理器102通过运行存储在存储器104内的软件程序以及模块,从而执行各种功能应用以及数据处理,即实现上述的应用程序的择一客户端为多客户端服务器生成密钥的方法。存储器104可包括高速随机存储器,还可包括非易失性存储器,如一个或者多个磁性存储装置、闪存、或者其他非易失性固态存储器。在一些实例中,存储器104可进一步包括相对于处理器102远程设置的存储器,这些远程存储器可以通过网络连接至计算机终端10。上述网络的实例包括但不限于互联网、企业内部网、局域网、移动通信网及其组合。
传输模块106用于经由一个网络接收或者发送数据。上述的网络具体实例可包括计算机终端10的通信供应商提供的无线网络。在一个实例中,传输模块106包括一个网络适配器(Network Interface Controller,NIC),其可通过基站与其他网络设备相连从而可与互联网进行通讯。在一个实例中,传输模块106可以为射频(Radio Frequency,RF)模块,其用于通过无线方式与互联网进行通讯。
在软件层面,上述择一客户端为多客户端服务器生成密钥的装置可以包括:
生成模块,用于生成完整的目标私钥,并根据所述目标私钥生成目标公钥;
拆分模块,用于将所述目标私钥拆分为2N份密钥分量,并为所述2N份密钥私钥中各密钥分量生成公钥分量,得到2N份公钥分量;
下发模块,用于通过客户端与密钥服务器之间建立的安全信道,将2N份密钥分量、2N份公钥分量和所述目标公钥,一一对应地下发至N个客户端和N个密钥服务器。
本申请的实施例还提供能够实现上述实施例中的择一客户端为多客户端服务器生成密钥的方法中全部步骤的一种电子设备的具体实施方式,所述电子设备具体包括如下内容:处理器(processor)、存储器(memory)、通信接口(Communications Interface)和总线;其中,所述处理器、存储器、通信接口通过所述总线完成相互间的通信;所述处理器用于调用所述存储器中的计算机程序,所述处理器执行所述计算机程序时实现上述实施例中的择一客户端为多客户端服务器生成密钥的方法中的全部步骤,例如,所述处理器执行所述计算机程序时实现下述步骤:
步骤1:第一客户端生成完整的目标私钥,并根据所述目标私钥生成目标公钥,其中,所述第一客户端为所述N个客户端中的一个客户端;
步骤2:所述第一客户端将所述目标私钥拆分为2N份密钥分量,并为所述2N份密钥私钥中各密钥分量生成公钥分量,得到2N份公钥分量;
步骤3:所述第一客户端通过客户端与密钥服务器之间建立的安全信道,将2N份密钥分量、2N份公钥分量和所述目标公钥,一一对应地下发至N个客户端和N个密钥服务器。
从上述描述可知,本申请实施例择一客户端为多客户端服务器生成密钥的方法,应用于密钥管理系统,该密钥管理系统包括:多个客户端和多个密钥服务器,由其中一个客户端生成完整的目标私钥和目标公钥,然后拆分得到多份密钥分量并下发,每个客户端和密钥服务器一份,从而实现了密钥分量和公钥的生成,通过上述方式解决了现有的 密钥管理系统中所存在的安全性和灵活性较低的问题,达到了有效提升密钥管理系统安全性和灵活性的技术效果。
本申请的实施例还提供能够实现上述实施例中的择一客户端为多客户端服务器生成密钥的方法中全部步骤的一种计算机可读存储介质,所述计算机可读存储介质上存储有计算机程序,该计算机程序被处理器执行时实现上述实施例中的择一客户端为多客户端服务器生成密钥的方法的全部步骤,例如,所述处理器执行所述计算机程序时实现下述步骤:
步骤1:第一客户端生成完整的目标私钥,并根据所述目标私钥生成目标公钥,其中,所述第一客户端为所述N个客户端中的一个客户端;
步骤2:所述第一客户端将所述目标私钥拆分为2N份密钥分量,并为所述2N份密钥私钥中各密钥分量生成公钥分量,得到2N份公钥分量;
步骤3:所述第一客户端通过客户端与密钥服务器之间建立的安全信道,将2N份密钥分量、2N份公钥分量和所述目标公钥,一一对应地下发至N个客户端和N个密钥服务器。
从上述描述可知,本申请实施例择一客户端为多客户端服务器生成密钥的方法,应用于密钥管理系统,该密钥管理系统包括:多个客户端和多个密钥服务器,由其中一个客户端生成完整的目标私钥和目标公钥,然后拆分得到多份密钥分量并下发,每个客户端和密钥服务器一份,从而实现了密钥分量和公钥的生成,通过上述方式解决了现有的密钥管理系统中所存在的安全性和灵活性较低的问题,达到了有效提升密钥管理系统安全性和灵活性的技术效果。
本说明书中的各个实施例均采用递进的方式描述,各个实施例之间相同相似的部分互相参见即可,每个实施例重点说明的都是与其他实施例的不同之处。尤其,对于硬件+程序类实施例而言,由于其基本相似于方法实施例,所以描述的比较简单,相关之处参见方法实施例的部分说明即可。
上述对本说明书特定实施例进行了描述。其它实施例在所附权利要求书的范围内。在一些情况下,在权利要求书中记载的动作或步骤可以按照不同于实施例中的顺序来执行并且仍然可以实现期望的结果。另外,在附图中描绘的过程不一定要求示出的特定顺序或者连续顺序才能实现期望的结果。在某些实施方式中,多任务处理和并行处理也是可以的或者可能是有利的。
虽然本申请提供了如实施例或流程图所述的方法操作步骤,但基于常规或者无创造性的劳动可以包括更多或者更少的操作步骤。实施例中列举的步骤顺序仅仅为众多步骤执行顺序中的一种方式,不代表唯一的执行顺序。在实际中的装置或客户端产品执行时,可以按照实施例或者附图所示的方法顺序执行或者并行执行(例如并行处理器或者多线程处理的环境)。
上述实施例阐明的系统、装置、模块或单元,具体可以由计算机芯片或实体实现,或者由具有某种功能的产品来实现。一种典型的实现设备为计算机。具体的,计算机例如可以为个人计算机、膝上型计算机、车载人机交互设备、蜂窝电话、相机电话、智能电话、个人数字助理、媒体播放器、导航设备、电子邮件设备、游戏控制台、平板计算机、可穿戴设备或者这些设备中的任何设备的组合。
虽然本说明书实施例提供了如实施例或流程图所述的方法操作步骤,但基于常规或者无创造性的手段可以包括更多或者更少的操作步骤。实施例中列举的步骤顺序仅仅为众多步骤执行顺序中的一种方式,不代表唯一的执行顺序。在实际中的装置或终端产品执行时,可以按照实施例或者附图所示的方法顺序执行或者并行执行(例如并行处理器或者多线程处理的环境,甚至为分布式数据处理环境)。术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含,从而使得包括一系列要素的过程、方法、产品或者设备不仅包括那些要素,而且还包括没有明确列出的其他要素,或者是还包括为这种过程、方法、产品或者设备所固有的要素。在没有更多限制的情况下,并不排除在包括所述要素的过程、方法、产品或者设备中还存在另外的相同或等同要素。
为了描述的方便,描述以上装置时以功能分为各种模块分别描述。当然,在实施本说明书实施例时可以把各模块的功能在同一个或多个软件和/或硬件中实现,也可以将实现同一功能的模块由多个子模块或子单元的组合实现等。以上所描述的装置实施例仅仅是示意性的,例如,所述单元的划分,仅仅为一种逻辑功能划分,实际实现时可以有另外的划分方式,例如多个单元或组件可以结合或者可以集成到另一个系统,或一些特征可以忽略,或不执行。另一点,所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口,装置或单元的间接耦合或通信连接,可以是电性,机械或其它的形式。
本领域技术人员也知道,除了以纯计算机可读程序代码方式实现控制器以外,完全可以通过将方法步骤进行逻辑编程来使得控制器以逻辑门、开关、专用集成电路、可编程逻辑控制器和嵌入微控制器等的形式来实现相同功能。因此这种控制器可以被认为是 一种硬件部件,而对其内部包括的用于实现各种功能的装置也可以视为硬件部件内的结构。或者甚至,可以将用于实现各种功能的装置视为既可以是实现方法的软件模块又可以是硬件部件内的结构。
本发明是参照根据本发明实施例的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器,使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中,使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品,该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上,使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理,从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
在一个典型的配置中,计算设备包括一个或多个处理器(CPU)、输入/输出接口、网络接口和内存。
内存可能包括计算机可读介质中的非永久性存储器,随机存取存储器(RAM)和/或非易失性内存等形式,如只读存储器(ROM)或闪存(flash RAM)。内存是计算机可读介质的示例。
计算机可读介质包括永久性和非永久性、可移动和非可移动媒体可以由任何方法或技术来实现信息存储。信息可以是计算机可读指令、数据结构、程序的模块或其他数据。计算机的存储介质的例子包括,但不限于相变内存(PRAM)、静态随机存取存储器(SRAM)、动态随机存取存储器(DRAM)、其他类型的随机存取存储器(RAM)、只读存储器(ROM)、电可擦除可编程只读存储器(EEPROM)、快闪记忆体或其他内存技术、只读光盘只读存储器(CD-ROM)、数字多功能光盘(DVD)或其他光学存储、磁盒式磁带,磁带磁磁盘存储或其他磁性存储设备或任何其他非传输介质,可用于存储可以被计算设备访 问的信息。按照本文中的界定,计算机可读介质不包括暂存电脑可读媒体(transitory media),如调制的数据信号和载波。
本领域技术人员应明白,本说明书的实施例可提供为方法、系统或计算机程序产品。因此,本说明书实施例可采用完全硬件实施例、完全软件实施例或结合软件和硬件方面的实施例的形式。而且,本说明书实施例可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器、CD-ROM、光学存储器等)上实施的计算机程序产品的形式。
本说明书实施例可以在由计算机执行的计算机可执行指令的一般上下文中描述,例如程序模块。一般地,程序模块包括执行特定任务或实现特定抽象数据类型的例程、程序、对象、组件、数据结构等等。也可以在分布式计算环境中实践本说明书实施例,在这些分布式计算环境中,由通过通信网络而被连接的远程处理设备来执行任务。在分布式计算环境中,程序模块可以位于包括存储设备在内的本地和远程计算机存储介质中。
本说明书中的各个实施例均采用递进的方式描述,各个实施例之间相同相似的部分互相参见即可,每个实施例重点说明的都是与其他实施例的不同之处。尤其,对于系统实施例而言,由于其基本相似于方法实施例,所以描述的比较简单,相关之处参见方法实施例的部分说明即可。在本说明书的描述中,参考术语“一个实施例”、“一些实施例”、“示例”、“具体示例”、或“一些示例”等的描述意指结合该实施例或示例描述的具体特征、结构、材料或者特点包含于本说明书实施例的至少一个实施例或示例中。在本说明书中,对上述术语的示意性表述不必须针对的是相同的实施例或示例。而且,描述的具体特征、结构、材料或者特点可以在任一个或多个实施例或示例中以合适的方式结合。此外,在不相互矛盾的情况下,本领域的技术人员可以将本说明书中描述的不同实施例或示例以及不同实施例或示例的特征进行结合和组合。
以上所述仅为本说明书实施例的实施例而已,并不用于限制本说明书实施例。对于本领域技术人员来说,本说明书实施例可以有各种更改和变化。凡在本说明书实施例的精神和原理之内所作的任何修改、等同替换、改进等,均应包含在本说明书实施例的权利要求范围之内。

Claims (10)

  1. 一种择一客户端为多客户端多服务器生成密钥的方法,应用于密钥管理系统,该密钥管理系统包括:N个客户端和N个密钥服务器,其中,N为大于等于2的正整数,其特征在于,所述方法包括:
    第一客户端生成完整的目标私钥,并根据所述目标私钥生成目标公钥,其中,所述第一客户端为所述N个客户端中的一个客户端;
    所述第一客户端将所述目标私钥拆分为2N份密钥分量,并为所述2N份密钥私钥中各密钥分量生成公钥分量,得到2N份公钥分量;
    所述第一客户端通过客户端与密钥服务器之间建立的安全信道,将2N份密钥分量、2N份公钥分量和所述目标公钥,一一对应地下发至N个客户端和N个密钥服务器。
  2. 根据权利要求1所述的方法,其特征在于,在将2N份密钥分量、2N份公钥分量和所述目标公钥,一一对应地下发至N个客户端和N个密钥服务器之后,还包括;
    所述第一客户端发起签名请求,其中,所述签名请求中携带有待签名数据;
    从所述N个密钥服务器和所述N个客户端中选择两个设备作为MPC计算方;
    所述N个客户端和所述N个密钥服务器中除MPC计算方之外的各个客户端和密钥服务器将自身对应的密钥分量拆分为第一子密钥和第二子密钥,并通过所述安全信道将第一子密钥传送至MPC计算方中的第一设备,将第二子密钥传送至MPC计算方中的第二设备;
    所述第一设备和所述第二设备通过所述安全信道发起MPC计算对所述待签名数据进行签名,得到签名文件;
    将签名文件发送至所述N个客户端和所述N个密钥服务器中除MPC计算方之外的各个客户端和密钥服务器。
  3. 根据权利要求2所述的方法,其特征在于,在将2N份密钥分量、2N份公钥分量和所述目标公钥,一一对应地下发至N个客户端和N个密钥服务器之后,还包括;
    所述第一客户端发起刷新密钥请求;
    所述N个客户端和所述N个密钥服务器中除MPC计算方之外的各个客户端和密钥服务器将自身对应的密钥分量拆分为第一子密钥和第二子密钥,并通过所述安全信道将第一子密钥传送至MPC计算方中的第一设备,将第二子密钥传送至MPC计算方中的第二设备;
    所述第一设备和所述第二设备通过所述安全信道发起MPC计算得到基于所述目标 私钥拆分的2N份刷新密钥分量,对所述2N份刷新密钥分量进行签名,得到2N份签名文件;
    将所述2N份刷新密钥分量中对应的2N份签名文件,一一对应地下发至N个客户端和N个密钥服务器;
    所述N个客户端和N个密钥服务器通过接收到签名文件验证接收到的刷新密钥分量的正确性,在验证通过的情况下,保存接收到的刷新密钥分量。
  4. 根据权利要求1所述的方法,其特征在于,在将2N份密钥分量、2N份公钥分量和所述目标公钥,一一对应地下发至N个客户端和N个密钥服务器之后,还包括;
    所述第一客户端发起签名请求,其中,所述签名请求中携带有待签名数据和所述目标公钥;
    所述N个客户端和所述N个密钥服务器通过所述安全信道发起MPC计算,以对所述待签名数据进行签名操作,得到签名文件,并根据所述目标公钥验证所述签名文件的正确性。
  5. 根据权利要求4所述的方法,其特征在于,在将2N份密钥分量、2N份公钥分量和所述目标公钥,一一对应地下发至N个客户端和N个密钥服务器之后,还包括;
    所述第一客户端发起刷新密钥请求;
    所述N个客户端和所述N个密钥服务器通过所述安全信道发起MPC计算得到基于所述目标私钥拆分的2N份刷新密钥分量,对所述2N份刷新密钥分量进行签名,得到2N份签名文件;
    将所述2N份刷新密钥分量和所述2N份签名文件,一一对应地下发至N个客户端和N个密钥服务器;
    所述N个客户端和N个密钥服务器通过所述目标公钥验证接收到的签名文件的正确性,在验证通过的情况下,更新并保存接收到的刷新密钥分量。
  6. 根据权利要求1至5中任一项所述的方法,其特征在于,在将2N份密钥分量、2N份公钥分量和所述目标公钥,一一对应地下发至N个客户端和N个密钥服务器之后,还包括;
    所述第一客户端通过备份方式获取所述目标私钥的备份,作为备份密钥;
    所述第一客户端将所述备份密钥拆分为2N份备份密钥分量,并通过所述目标私钥对所述2N份备份密钥分量进行签名,得到2N份签名文件;
    所述第一客户端通过所述安全信道,将所述2N份备份密钥分量和所述2N份签名 文件,一一对应地下发至所述N个客户端和N个密钥服务器;
    所述N个客户端和所述N个密钥服务器通过存储的所述目标公钥,验证接收到的签名文件的有效性,在确定签名文件有效的情况下,更新并保存接收到的备份密钥分量。
  7. 根据权利要求1至5中任一项所述的方法,其特征在于,在第一客户端生成完整的目标私钥,并根据所述目标私钥生成目标公钥,其中,所述第一客户端为所述N个客户端中的一个客户端之前,还包括:
    所述N个客户端和所述N个服务器之间通过确认身份程序完成双向认证,并下发认证材料,其中,所述认证材料用于鉴权并建立所述安全通道。
  8. 根据权利要求7所述的方法,其特征在于,所述确认身份程序包括以下至少之一:短信、验证码、账号密钥、指纹、人脸、证书。
  9. 一种终端设备,包括处理器以及用于存储处理器可执行指令的存储器,所述处理器执行所述指令时实现权利要求1至8中任一项所述方法的步骤。
  10. 一种计算机可读存储介质,其上存储有计算机指令,所述指令被执行时实现权利要求1至8中任一项所述方法的步骤。
PCT/CN2019/076578 2019-02-28 2019-02-28 择一客户端为多客户端多服务器生成密钥的方法和设备 WO2020172882A1 (zh)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105468986A (zh) * 2015-12-02 2016-04-06 深圳大学 一种保密信息检索方法及系统
CN105794145A (zh) * 2013-11-27 2016-07-20 微软技术许可有限责任公司 服务器辅助的具有数据传输的私有集交集(psi)
CN106961336A (zh) * 2017-04-18 2017-07-18 北京百旺信安科技有限公司 一种基于sm2算法的密钥分量托管方法和系统
WO2019027787A1 (en) * 2017-08-03 2019-02-07 Hrl Laboratories, Llc CLOUD-TYPE MULTI-CLIENT CALCULATION PRESERVING CONFIDENTIALITY WITH APPLICATION TO SAFE NAVIGATION
CN109377360A (zh) * 2018-08-31 2019-02-22 西安电子科技大学 基于加权门限签名算法的区块链资产交易转账方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105794145A (zh) * 2013-11-27 2016-07-20 微软技术许可有限责任公司 服务器辅助的具有数据传输的私有集交集(psi)
CN105468986A (zh) * 2015-12-02 2016-04-06 深圳大学 一种保密信息检索方法及系统
CN106961336A (zh) * 2017-04-18 2017-07-18 北京百旺信安科技有限公司 一种基于sm2算法的密钥分量托管方法和系统
WO2019027787A1 (en) * 2017-08-03 2019-02-07 Hrl Laboratories, Llc CLOUD-TYPE MULTI-CLIENT CALCULATION PRESERVING CONFIDENTIALITY WITH APPLICATION TO SAFE NAVIGATION
CN109377360A (zh) * 2018-08-31 2019-02-22 西安电子科技大学 基于加权门限签名算法的区块链资产交易转账方法

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