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1. (US20190377889) VERIFIABLE VERSION CONTROL ON AUTHENTICATED AND/OR ENCRYPTED ELECTRONIC DOCUMENTS

Office : United States of America
Application Number: 16484876 Application Date: 01.02.2018
Publication Number: 20190377889 Publication Date: 12.12.2019
Publication Kind : A1
Prior PCT appl.: Application Number:PCTEP2018052494 ; Publication Number: Click to see the data
IPC:
G06F 21/62
H04L 9/06
H04L 9/08
G PHYSICS
06
COMPUTING; CALCULATING; COUNTING
F
ELECTRIC DIGITAL DATA PROCESSING
21
Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
60
Protecting data
62
Protecting access to data via a platform, e.g. using keys or access control rules
H ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
L
TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
9
Arrangements for secret or secure communication
06
the encryption apparatus using shift registers or memories for blockwise coding, e.g. D.E.S. systems
H ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
L
TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
9
Arrangements for secret or secure communication
06
the encryption apparatus using shift registers or memories for blockwise coding, e.g. D.E.S. systems
08
Key distribution
CPC:
H04L 9/0637
G06F 21/6209
H04L 9/0643
H04L 9/0825
H04L 9/085
Applicants: Michael Mertens
Michael Raumann
Inventors: Michael Mertens
Michael Raumann
Priority Data: 17155614.5 10.02.2017 EP
Title: (EN) VERIFIABLE VERSION CONTROL ON AUTHENTICATED AND/OR ENCRYPTED ELECTRONIC DOCUMENTS
Abstract: front page image
(EN)

The present invention concerns a method for encrypting files performed by a client computer, the method comprising encrypting at least a part of the content of a file into a change-set data structure using a secret key shared among a plurality of users, and signing the change-set data structure using a private signing key of a user of the client computer. The invention also concerns a method for decrypting files performed by a client computer, the method comprising receiving a change-set data structure, verifying a digital signature of the change-set data structure using a public verification key of a user who created the change-set, and decrypting an encrypted data portion of the change-set data structure to obtain the file using a secret key shared among a plurality of users.