Methods of deriving a time stamp, and signing a data stream, and electronic device, server and computer programs
US10389534B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 18, 2016 |
| Grant date | Aug 20, 2019 |
| Priority date | — |
| Expiry date | May 2, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2209/80
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A server receives a client's signing request comprising a hash value of data, the hash value being formed using a time-forwarded one-time signing key that comprises a time-forwarded index The server queues the signing request, pushes the hash value to a signature infrastructure entity at the time-forwarded time, and receives a time stamp in return. A client obtains a time stamp for each piece of a stream of pieces of data by collecting the pieces of data and deriving one-time signing keys of a one-time signing key hash chain, forming a stream of signing requests for the pieces of data by applying the one-time signing keys with time-forwarded indices for the respective piece of data to calculate hash values of the respective pieces of data, and transmitting the stream of signing requests comprising the hash values to a server for deriving time stamps for the pieces of data, respectively.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.