Providing smart contracts including secrets encrypted with oracle-provided encryption keys using threshold cryptosystems
US11295024B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 18, 2019 |
| Grant date | Apr 5, 2022 |
| Priority date | — |
| Expiry date | Sep 23, 2039 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2463/062
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Providing smart contracts including secrets encrypted with oracle-provided encryption keys using thresholding cryptosystems is disclosed. In one example, a contract creator encrypts sensitive data necessary for executing a smart contract into ciphertext with multiple symmetric cryptographic keys using a threshold cryptosystem, such that a subset of at least size R of the symmetric cryptographic keys are required to decrypt the ciphertext. The symmetric cryptographic keys are encrypted into wrappers using a public cryptographic key of a contract executor. Envelopes are generated using public cryptographic keys of corresponding contract oracles, where the envelopes include the wrappers encrypted using the public cryptographic keys, and policies that specify condition(s) precedent and are authenticated using the public cryptographic keys. The smart contract, including the envelopes, the ciphertext, and R, is then deployed to the contract executor. In this manner, the sensitive data is protected from unauthorized access within the smart contract.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.