# US 11,451,543 B2 · Securing digital data transmission in a communication network

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- Number: US 11,451,543 B2
- Document ID: US11451543B2
- Status: Granted
- Kind: B2
- Application number: 16/768,360
- Filed: 2018-12-07
- Published: 2020-11-19
- Granted: 2022-09-20
- Earliest claimed: 2017-12-12
- Assignees: Nagravision S.A.
- Applicants: Nagravision S.A.
- Inventors: Pierre Sarda; Didier Hunacek; John Tinsman; Philippe Stransky-Heilkron
- Web page: https://patentgrep.com/patent/US11451543B2

## CPC

- H04L 63/0876: {based on the identity of the terminal or configuration, e.g. MAC address, hardware or software configuration or device fingerprint}
- G06F 21/44: Program or device authentication
- H04L 9/0866: {involving user or device identifiers, e.g. serial number, physical or biometrical information, DNA, hand-signature or measurable physical characteristics}
- H04L 9/321: {involving a third party or a trusted authority}
- H04L 63/0428: {wherein the data content is protected, e.g. by encrypting or encapsulating the payload}
- H04L 63/06: {for supporting key management in a packet data network (cryptographic mechanisms or cryptographic arrangements for key management H04L9/08)}
- H04N 7/181: {for receiving images from a plurality of remote sources}
- H04N 21/42684: {Client identification by a unique number or address, e.g. serial number, MAC address, socket ID (network arrangements, protocols or services for addressing or naming H04L61/00)}
- H04N 21/835: Generation of protective data, e.g. certificates {(protecting software against unauthorised usage in a vending or licensing environment G06F21/10)}
- H04N 21/8358: involving watermark {(protecting executable software by watermarking G06F21/16; image watermarking in general G06T1/0021; watermarks inserted in still images for transmission purposes H04N1/32144; inserting watermarks during video coding H04N19/467)}
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION

## Abstract

A method for securing transmission of digital data in a communication network comprising a central station or a terminal and at least one device monitored by the central station via the communication network. The at least one device is configured to produce and to transmit a digital data stream to the central station or terminal. The at least one device further comprises a secure non-volatile memory for storing at least device specific information. The at least one device forms a data block based on at least the device specific information stored in the secure memory. The data block thus formed may compose additional data to be merged with the digital data stream produced by the at least one device. A modified digital data stream results from this merging operation and is transmitted by the at least one device to the central station or terminal.

## Claims

### Claim 1

A secure chipset for transmission, in a communication network, of digital data received from a first communicating device having a communications module when the first communicating device is coupled to the secure chipset, the secure chipset comprising:
a processor;
a secure non-volatile memory configured to store first device specific information specific to the communicating device; and
a merging module configured to
(a) receive the digital data from the first communicating device,
(b) merge the digital data with information based on the first device specific information stored in the secure non-volatile memory to form modified digital data, and
(c) output the modified digital data to the first communicating device for transmission by the communications module.

### Claim 2 (depends on 1)

The secure chipset according to claim 1, wherein the first device specific information is stored in the non-volatile memory during a network setup up phase.

### Claim 3 (depends on 1)

The secure chipset according to claim 1, wherein the first device specific information includes a unique identifier of the communicating device.

### Claim 4 (depends on 3)

The secure chipset according to claim 3, wherein the unique identifier of the communicating device is a Media Access Control (MAC) address.

### Claim 5 (depends on 1)

The secure chipset according to claim 1, wherein the digital data includes a time stamp and a digest of device specific information for all communicating devices in the communication network.

### Claim 6 (depends on 5)

The secure chipset according to claim 5, wherein the digest is formed by applying a hash function on all or part of the device specific information data of the communicating devices in the communication network.

### Claim 7 (depends on 1)

The secure chipset according to claim 1, wherein the digital data includes video data.

### Claim 8 (depends on 1)

The secure chipset according to claim 1, wherein the digital data further includes a watermark merged with the video data, the watermark including at least the first device specific information of the communicating device.

### Claim 9 (depends on 8)

The secure chipset according to claim 8, wherein the watermark further includes authentication data including a time code, sequence number, and an image signature.

### Claim 10 (depends on 9)

The secure chipset according to claim 9, wherein the image signature includes an encrypted finger print of the sequence number that is encrypted with a predetermined key.