Secure Distribution of Content

Method for secure delivery of key information from at least a first secure module associated with a first content distribution network CDN1 to at least a second secure module in a content receiving entity using a split-key cryptosystem comprising encryption and decryption algorithms, a cipher algorithm for generating an encryption key and a decryption key on the basis of secret information and a split-key algorithm using the secret information for at least one of (i) splitting the encryption key into different split-encryption keys or splitting the decryption key into different split-decryption keys;

• the split-key cryptosystem further comprising a number of consecutive encryption and decryption operations on the method comprising:
• providing a first secure module with first key information comprising an encrypted key, wherein the encrypted key is a key for encrypting content processed by said CDN1;
• a key generator comprising said cipher and split-key algorithm generating at least a first split-key information and transmitting said first split-key information to said first secure module;
• said first secure module generating second key information comprising a partially decrypted encrypted key;
• and,
• transmitting second key information to said second secure module in said content receiving entity.

Method for secure delivery of a content item via at least a first and second content distribution network (CDN1, CDN2) to at least one content receiving entity using a split-key cryptosystem comprising an encryption algorithm and a decryption algorithm, a cipher algorithm for generating an encryption key and a decryption key on the basis of secret information and a split-key algorithm using the secret information for at least one of (i) splitting the encryption key into different split-encryption keys or (ii) splitting the decryption key into different split-decryption keys, the method comprising:

• providing said first CDN1 with at least one encrypted content item or a partially decrypted content item;
• said first CDN1 transmitting said at least one encrypted content item or a partially decrypted content item to said second CDN2;
• a key generator comprising said cipher and split-key algorithm generating split-key information associated with said at least one encrypted content item or a partially decrypted content;
• transmitting a split-decryption control message comprising said split-key information to said first CDN1;
• said first CDN1 relaying said split-decryption control message to said second CDN2;
• generating partially decrypted content item or further partially decrypted content item by applying a decryption operation on said encrypted content item or said partially decrypted content item using said decryption algorithm and said split-key information;
• and,
• transmitting said partially decrypted content item or further partial decrypted content item to said content receiving entity.

System for secure delivery of a content item to a content consumption unit comprising:

• an encryption module associated a content source, said encryption module comprising encryption algorithm E for generating an encrypted content item;
• a first decryption module comprising decryption algorithm D associated with a first content distribution network (CDN1);
• a second decryption module comprising decryption algorithm D associated with at least one content consumption unit;
• a key generator associated with said encryption module comprising a cipher and split-key algorithm for generating an encryption key and a decryption key on the basis of secret information and a split-key algorithm using said secret information for at least one of (i) splitting the encryption key into different split-encryption keys or splitting the decryption key into different split-decryption keys;
• wherein said algorithms further comprise a number of consecutive encryption and decryption operations on said content item.