Patent US10230756

Resisting replay attacks efficiently in a permissioned and privacy-preserving blockchain network
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US10230756

1. A method for communication in a blockchain network of computer systems, the method comprising: (2) (2)

at a user computer system of the blockchain network of computer systems: generating a security value that is to be used only once;

generating a transaction signed with a security certificate and including the security value, wherein the transaction indicates a group of validator computer systems of the blockchain network of computer systems that is eligible to execute the transaction; and

transmitting the transaction over the blockchain network of computer systems; and

at a validator computer system of the group of validator computer systems of the blockchain network of computer systems: submitting a vote for the transaction that indicates whether the validator computer system has validated the transaction; and

adding a sequence number of the transaction to the transaction,

wherein one or more other validator computer systems in the group of validator computer systems of the blockchain network of computer systems considers whether the transaction is valid if and only if the sequence number indicates that the transaction is more recent than other transactions being considered for validation by the one or more other validator computer systems.

2. The method of claim 1, wherein the security certificate includes information identifying the user computer system and the security value is generated as a function of a security value included in a previous message. (2) (0)

3. The method of claim 2, wherein the function used to generate the security value is selected from a group including a counter function, a hash function, and a random function. (0)

4. The method of claim 2, wherein the transaction further comprises computer program instructions to be executed to perform at least one function relating to a digital transaction, the method further comprising: (1) (1)

6. The method of claim 1, wherein the security certificate does not include information identifying the user computer system, the security certificate has a validity period, and the security value is generated as a random function. (1) (0)

7. The method of claim 6, wherein the transaction further comprises computer program instructions to be executed to perform at least one function relating to a digital transaction, the method further comprising: (1) (1)

9. A blockchain network of computer systems comprising: (2) (5)

a user computer system and a group of validator computer systems, wherein the user computer system comprises a first processor and a first memory storing computer program instructions, the first processor configured to access the first memory and execute the computer program instructions stored in the first memory to:

generate a security value that is to be used only once;

generate a transaction signed with a security certificate and including the security value, wherein the transaction indicates that the group of validator computer systems of the blockchain network of computer systems is eligible to execute the transaction; and

transmit the transaction over the blockchain network of computer systems, and

wherein a validator computer system of the group of validator computer systems of the blockchain network of computer systems comprises a second processor and a second memory storing computer program instructions, the second processor configured to access the second memory and execute the computer program instructions stored in the second memory to: submit a vote for the transaction that indicates whether the validator computer system has validated the transaction; and

add a sequence number of the transaction to the transaction,

10. The blockchain network of computer systems of claim 9, wherein the security certificate includes information identifying the user computer system and the security value is generated as a function of a security value included in a previous message. (2) (0)

11. The blockchain network of computer systems of claim 10, wherein the function used to generate the security value is selected from a group including a counter function, a hash function, and a random function. (0)

12. The blockchain network of computer systems of claim 10, wherein the transaction further comprises computer program instructions to be executed to perform at least one function relating to a digital transaction and the second memory of the validator computer system further comprises computer program instructions executable by the second processor of the validator computer system to: (1) (2)

14. The blockchain network of computer systems of claim 9, wherein the security certificate does not include information identifying the user computer system, the security certificate has a validity period, and the security value is generated as a random function. (1) (0)

15. The blockchain network of computer systems of claim 14, wherein the transaction further comprises computer program instructions to be executed to perform at least one function relating to a digital transaction and the second memory of the validator computer system further comprises computer program instructions executable by the second processor of the validator computer system to: (1) (2)

execute the digital transaction by executing the computer program instructions to perform the at least one function relating to the digital transaction; and

store information relating to the executed digital transaction including a hash of the security value.

16. The blockchain network of computer systems of claim 15, wherein the first memory of the user computer system further comprises computer program instructions executable by the first processor of the user computer system to: (0) (1)

17. A computer program product for communicating in a blockchain network of computer systems comprising a user computer system and a group of validator computer systems, the computer program product comprising a non-transitory computer readable medium and computer program instructions stored on the computer readable medium and executable by a processor to perform at the user computer system: (2) (4)

generating a security value that is to be used only once;

generating a transaction signed with a security certificate and including the security value, wherein the transaction indicates that the group of validator computer systems of the blockchain network of computer systems is eligible to execute the transaction; and

transmitting the transaction over the blockchain network of computer systems,

the computer program instructions being further executable by the processor to perform at a validator computer system of the group of validator computer systems of the blockchain network of computer systems: submitting a vote for the transaction that indicates whether the validator computer system has validated the transaction; and

adding a sequence number of the transaction to the transaction,

18. The computer program product of claim 17, wherein the security certificate includes information identifying the user computer system and the security value is generated as a function of a security value included in a previous message. (2) (0)

19. The computer program product of claim 18, wherein the function used to generate the security value is selected from a group including a counter function, a hash function, and a random function. (0)

20. The computer program product of claim 18, wherein the transaction further comprises computer program instructions to be executed to perform at least one function relating to a digital transaction, the computer program instructions being further executable by the processor to perform at the validator computer system: (1) (2)

22. The computer program product of claim 17, wherein the security certificate does not include information identifying the user computer system, the security certificate has a validity period, and the security value is generated as a random function. (1) (0)

23. The computer program product of claim 22, wherein the transaction further comprises computer program instructions to be executed to perform at least one function relating to a digital transaction, the computer program instructions being further executable by the processor to perform at the validator computer system: (1) (2)

executing the digital transaction by executing the computer program instructions to perform the at least one function relating to the digital transaction; and

storing information relating to the executed digital transaction including a hash of the security value.

24. The computer program product of claim 23, the computer program instructions being further executable by the processor to perform at the user computer system: (0) (1)

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Patent US10230756

Resisting replay attacks efficiently in a permissioned and privacy-preserving blockchain network

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