Granted Patent B2

US 12,495,838 · App. 17/549,455 · Granted Dec 16, 2025

Inventors: Oliver Talbot (Liverpool, GB); Daniel Fard (Liverpool, GB); Kaikai Liu (Liverpool, GB); Daniel Harden (San Jose, CA); Britt Jensen (San Jose, CA); Brian Leach (San Jose, CA)

A24F40/65G06F8/65G06F21/602

Abstract

Claims (48)

1 . A system for managing a plurality of smoking substitute devices, the system comprising:

a plurality of smoking substitute devices, each smoking substitute device comprising:

a control unit;

a memory configured to store firmware for operating the smoking substitute device and a device-specific encryption key; and

a communications interface; and

an application server configured to communicate to the smoking substitute device a firmware update message that is encrypted with the device-specific encryption key,

wherein the smoking substitute device is configured to obtain an encrypted firmware image,

wherein the firmware update message includes a firmware key for decrypting the encrypted firmware image, and

wherein the smoking substitute device is configured to use the device-specific encryption key to decrypt the firmware update message, to obtain the firmware key for decrypting the encrypted firmware image,

wherein the same firmware key is included in the firmware update message for each of the plurality of smoking substitute devices.

2 . The system of claim 1 , wherein the application server is configured to communicate a firmware update notification that includes a firmware image location identifier and the firmware update message, and wherein the encrypted firmware image is obtainable using the firmware image location identifier.

3 . The system of claim 1 further comprising a mobile device on which an application is installed, wherein the smoking substitute device is in wireless communication with the mobile device via the communications interface, wherein the application server is configured to be communicate to the smoking substitute device via the application.

4 . The system of claim 1 , wherein the smoking substitute device is in wireless communication with the application server.

5 . The system of claim 1 , wherein the smoking substitute device is further configured to:

decrypt the encrypted firmware image using the firmware key; and

update the firmware for operating the smoking substitute device using the decrypted firmware image.

6 . The system of claim 5 , wherein the smoking substitute device is further configured to:

verify the update firmware using identification data in the firmware update message; and

report an outcome of verification.

7 . The system of claim 6 , wherein the smoking substitute device has a wireless communication link with an application server or a mobile device running an application, and wherein the outcome of verification is reported in a hello message sent via the wireless communication link.

8 . The system of claim 1 further comprising a signing server in communication with the application server, wherein the signing server is configured to encrypt the firmware image with the firmware key, and wherein access to the firmware key by the application server is prohibited.

9 . The system of claim 1 , wherein the smoking substitute device is configured to transition into an update mode, and wherein the smoking substitute device is configured to receive the encrypted firmware image and firmware update message when in the update mode.

10 . A method for managing a system, the method comprising, for each of a plurality of smoking substitute devices:

encrypting, using a device-specific encryption key, a firmware update message, wherein the firmware update message includes a firmware key;

transmitting the encrypted firmware update message to the smoking substitute device;

obtaining, by the smoking substitute device, an encrypted firmware image; and

decrypting, by the smoking substitute device using the device-specific encryption key, the firmware update message in order to obtain the firmware key, wherein the firmware key is for decrypting the encrypted firmware image; and

wherein the same firmware key is included in the firmware update message for each of the plurality of smoking substitute devices.

11 . The method of claim 10 further comprising:

decrypting, by the smoking substitute device, the firmware image using the firmware key; and

updating the firmware of the smoking substitute device using the decrypted firmware image.

12 . The method of claim 11 further comprising:

verifying the update firmware using identification data in the firmware update message; and

reporting an outcome of verification.

13 . A plurality of smoking substitute devices, each smoking substitute device comprising:

a control unit;

a memory configured to store firmware for operating the smoking substitute device, and to store a device-specific encryption key; and

a communications interface;

wherein, for each of the plurality of smoking substitute devices:

the smoking substitute device is configured to obtain an encrypted firmware image;

the smoking substitute device is configured to receive, from an application server, a firmware update message;

the firmware update message includes a firmware key for decrypting the encrypted firmware image; and

the firmware update message is decryptable using the device-specific encryption key; and

wherein the same firmware key is included in the firmware update message for each of the plurality of smoking substitute devices.

14 . The smoking substitute device of claim 13 , wherein the smoking substitute device is configured to:

decrypt, with the device-specific encryption key, the firmware update message in order to obtain the firmware key;

decrypt, with the firmware key, the encrypted firmware image; and

update, with the decrypted firmware image, the firmware for operating the smoking substitute device.

Assignments (6)

Priority Claims (9)

Continuity (3)

References Cited (53)