Search International and National Patent Collections

1. (WO2018138724) ASYMMETRIC CONTENT PROTECTION OF LARGE DATASTREAMS

Pub. No.:    WO/2018/138724    International Application No.:    PCT/IL2018/050090
Publication Date: Fri Aug 03 01:59:59 CEST 2018 International Filing Date: Thu Jan 25 00:59:59 CET 2018
IPC: H04L 9/08
G06F 21/10
G06F 21/60
G06F 21/62
H04H 60/00
H04H 60/14
H04H 60/23
H04N 21/00
H04N 5/913
H04N 21/43
Applicants: SIX DEGREES SPACE LTD
Inventors: GREENSPAN, Daniel
Title: ASYMMETRIC CONTENT PROTECTION OF LARGE DATASTREAMS
Abstract:
A content protection system includes an encrypter to encrypt fragments of a datastream, each with one of a multiplicity of related encryption keys, so as to require a decrypter to use limited exhaustive key searches to determine the corresponding decryption keys. The encrypter includes a key generator to generate the encryption keys and an individual key encrypter to encrypt each the fragment with its associated encryption key. Each encryption key is a function of a disclosed key and an additional random parameter. A content presentation system includes a fragment selector and a key deriver. The fragment selector selects a fragment of a datastream to present to a user based on a user selection. The key deriver finds the value of the additional random parameter to determine the individual key for decrypting the selected fragment.