Patent · US Active

Document verification with distributed calendar infrastructure

US8719576B2 · kind B2 · utility

13Cited by

2References

11Claims

0Family size

Assignee

Guardtime IP Holdings Limited · VG

Inventors

Ahto Buldas · Tallinn, EE
Mart Saarepera · Tallinn, EE

Key dates

Filing date	Sep 24, 2012
Grant date	May 6, 2014
Priority date	—
Expiry date	Sep 24, 2032

Classification

Technology area (CPC H)Electricity
CPC primaryH04L9/50
WIPO fieldDigital communication
WIPO sectorElectrical engineering

Abstract

Transformations of digital records are used as lowest level inputs to a tree data structure having a root in a core system and having nodes computed as digital combinations of child node values. A combination of root values is published in a permanent medium. Signature vectors are associated with the digital records and have parameters that enable recomputation upward through the tree data structure to either a current root value or to the published value. Recomputation yields the same value only if a candidate digital record is an exact version of the original digital record included in the original computation of the value.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.