Patent ID: 9350539
Filing Date: 2016-05-24
CPC Classification: H04L

Claim Text:
1. Method for secure delivery of a content item from at least a first content distribution network (CDN 1 ) to at least one content receiving entity using a split-key cryptosystem comprising an encryption algorithm E and a decryption algorithm D, a cipher algorithm for generating an encryption key e and a decryption key d on the basis of secret information and a split-key algorithm using the secret information for splitting e into i different split-encryption keys e 1 , e 2 , . . . , e i and/or for splitting d into k different split-decryption keys d 1 , d 2 , . . . , d k respectively; wherein the split-key cryptosystem is further defined in that executing a number of consecutive encryption and decryption operations on content item X, applying E and split-encryption keys e a content source providing said at least one CDN a key generator associated with said content source comprising said cipher and split-key algorithm generating first split-key information comprising at least one of said split decryption-keys and transmitting said first split-key information to said first CDN generating a partially decrypted content item on the basis of said encrypted content item, said decryption algorithm and said first split-key information; and transmitting said partially decrypted content item to said content receiving entity.