JPWO2021111211A5

JPWO2021111211A5 -

Info

Publication number: JPWO2021111211A5
Application number: JP2022533174A
Authority: JP
Publication date: 2023-10-17

Claims

A computer- implemented method for generating an identity (ID)-based cryptographic key, the method comprising: being performed by a first party having a personal identifier;
obtaining a set of private key shares and a corresponding set of public key shares, wherein each private key share is generated based on the personal identifier, and at least one of the set of private key shares is , generated by each one of the set of key generating parties;
generating an ID-based private key based on each of the one or more private key shares;
generating a partial ID-based public key , wherein the partial ID-based public key is generated based on each of the corresponding set of public key shares;
transmitting the partial ID-based public key to at least one of the set of key-generating parties to generate an ID-based public key, where the ID-based public key includes the personal identifier and the partial ID - based public key; and/or generating the ID-based public key, wherein the ID-based public key includes the personal identifier and the partial ID-based public key.
method including.

a first output of a first blockchain transaction includes the ID-based public key, the ID-based public key includes the personal identifier and the partial ID-based public key; The method of claim 1, comprising obtaining the ID-based public key from a blockchain transaction.

The obtaining the ID-based public key from the first blockchain transaction comprises:
obtaining a transaction identifier for the first blockchain transaction from at least one of the one or more key generation parties;
and retrieving the first blockchain transaction from a blockchain on which the first blockchain transaction was recorded using the transaction identifier.

4. A method according to any preceding claim, comprising: obtaining the ID-based public key from at least one of the set of key-generating parties.

encrypting a first message using the ID-based public key to generate a first encrypted message;
sending the first encrypted message to a second party; and/or generating a second blockchain transaction having an output including the first encrypted message; A method according to any one of claims 1 to 4.

obtaining a second encrypted message encrypted using the ID-based public key;
and decrypting the second encrypted message using the private key to reveal a second message.

7. A method according to any preceding claim, comprising transmitting the personal identifier to at least one of the one or more key generation parties.

The transmitting the personal identifier comprises:
generating a third blockchain transaction that includes an output that includes the personal identifier;
8. The method of claim 7, comprising: transmitting the third blockchain transaction to one or more nodes of a blockchain network for inclusion in the blockchain.

the first party has a first public key, the first blockchain transaction includes a second output locked to the first public key of the first party, and the method includes:
a) referencing the second output of the first blockchain transaction; and b) comprising an input that includes a signature generated based on a private key corresponding to the first public key of the first party. generating a fourth blockchain transaction;
and transmitting the fourth blockchain transaction to one or more nodes of the blockchain network for inclusion in the blockchain.

The transmitting the partial ID-based public key to the at least one of the set of key generating parties comprises:
generating a fifth blockchain transaction that includes an output that includes the partial ID-based public key;
10. A method according to any preceding claim, comprising: transmitting the fifth blockchain transaction to one or more nodes of the blockchain network for inclusion in the blockchain.

The first party 's identifier may include the first party's name and/or address, the first party's email address, telephone number, passport number, driver's license number, social media profile, year of birth. 11. A method according to any one of claims 1 to 10, comprising one or more of the month and day, and a group member identifier.

A computer- implemented method for generating an identity (ID)-based cryptographic key, wherein a first party has a personal identifier, the method being performed by a first key-generating party;
transmitting a private key share to the first party, wherein the private key share is generated based on the personal identifier and has a corresponding public key share;
obtaining a partial ID-based public key, wherein the partial ID-based public key is generated based on the corresponding public key share;
generating and/or obtaining an ID -based public key, wherein the ID-based public key is generated based on the partial ID-based public key and the personal identifier;
and generating a first blockchain transaction that includes a first output that includes the ID-based public key.

13. The method of claim 12, comprising transmitting the first blockchain transaction to one or more nodes of a blockchain network for inclusion in a blockchain.

13. The method of claim 12, comprising sending the first blockchain transaction to the first party.

15. A method according to any one of claims 12 to 14, wherein the first output of the first blockchain transaction is an unusable output.

16. A method according to any one of claims 13 to 15, comprising obtaining the personal identifier from the first party.

The blockchain includes a third blockchain transaction generated by the first party and including the personal identifier, and the obtaining the personal identifier from the first party includes a third blockchain transaction generated by the first party. 17. The method of claim 16, comprising obtaining the personal identifier from a transaction.

the first key-generating party has a first public key, and the first blockchain transaction includes a second output locked to the first public key of the first key-generating party; 18. A method according to any one of claims 12 to 17.

a) referencing the second output of the first blockchain transaction; and b) a second input comprising a signature generated based on a private key corresponding to the public key of the first key-generating party. generating 4 blockchain transactions ; and
and transmitting the fourth blockchain transaction to one or more nodes of the blockchain network for inclusion in the blockchain.

13. From claim 12, wherein the first party has a first public key and the first blockchain transaction includes a second output locked to the first public key of the first party. 20. The method according to any one of 19.

The blockchain includes a fifth blockchain transaction that includes the partial ID-based public key, and the obtaining the partial ID-based public key includes acquiring the partial ID-based public key from the fifth blockchain transaction. 21. A method according to any one of claims 12 to 20, comprising obtaining.

generating a sixth blockchain transaction that includes an output that includes the private key share, where the transmitting the private key share to the first party includes: transmitting the sixth blockchain transaction to one or more nodes of the blockchain network;
22. A method according to any one of claims 12 to 21.

23. The method of claim 22, wherein the private key share is transmitted in encrypted form.

generating a seventh blockchain transaction that includes an output that includes a set of parameters used to generate the ID-based public key;
24. A method according to any one of claims 12 to 23, comprising: transmitting the seventh blockchain transaction to one or more nodes of the blockchain network for inclusion in the blockchain.

The partial ID-based public key is generated based on a plurality of public key shares, each public key share generated by a respective one of a set of key-generating parties, and the seventh blockchain transaction is based on the partial ID-based public key. 25. The method of claim 24, comprising the set of parameters used by each respective key generation party to generate a base public key.

26. The method of claim 24 or 25, wherein the first key generation party is a mining node of the blockchain network and the seventh blockchain transaction is a generation transaction.

A computer device,
a memory comprising one or more memory units;
a processing device comprising one or more processing units, wherein the memory stores code configured to execute on the processing device, the code residing on the processing device. configured to carry out the method according to any one of claims 1 to 26 when:
computer equipment.

27. A computer program product embodied on a computer readable storage and configured to perform a method according to any one of claims 1 to 26 when executed on computer equipment.