Trustonic Limited

John Dent

Chris Loreskar

Jan-Erik Gustav Ekberg

Alec Milne Edgington

Simon Butler

Baptiste Gourdin

Jesus Jose Gianzo Villaverde

Derick Cassidy

A method for providing a secure user interface on a computing device comprising: receiving, from a user application, a request to utilise a secure user interface on the computing device; obtaining, by a first countermeasure module, first information associated with a security context of the computing device; generating, by the first countermeasure module, a first security assessment based on analysis of the first information; determining, by a security determination module, whether to permit the request to utilise the secure user interface based on the first security assessment; and responsive to a positive determination, enabling access by the user application to the secure user interface.

Secure user interface side-channel attack protection

A method for remotely performing secure change of operational mode of a telecommunications device, the method comprising: establishing a first secure channel between a modem of the telecommunications device and an application executing in an Execution Environment of the telecommunications device; establishing a second secure channel between the application and a remote server; enabling the modem in a limited operational mode; generating a request, by the modem or the application, to verify the validity of a subscriber identity module of the telecommunications device; retrieving, by the modem, module identification information from the subscriber identity module; retrieving verification information, by the application and from the remote server, using the second secure channel, sending the module identification information from the modem to the application using the first secure channel, verifying at the application whether the subscriber identity module is valid using the module identification information and the verification information, and sending the verification result from the application to the modem using the first secure channel, or retrieving verification information, by the application and from the remote server, using the second secure channel, sending the verification information from the application to the modem using the first secure channel and verifying at the modem whether the subscriber identity module is valid using the module identification information and the verification information, or sending the module identification information from the modem to the remote server, verifying at the remote server whether the subscriber identity module is valid using the module identification information and verification information available at the server, sending the verification result from the remote server to the application using the second secure channel, and sending the verification result from the application to the modem using the first secure channel; responsive to a positive verification of the subscriber identity module transitioning the modem from the limited operational mode to an enhanced operational mode.

Remote secure unlock

A method for a device comprises enrolling a specified application installed on the device into a chain of trust provided by a private key infrastructure. In the chain of trust, a child certificate is attested as valid by an attestor associated with a parent certificate in the chain of trust. Enrolling includes generating an application certificate-A for verifying that the specified application is installed on the device. The application certificate is a descendant certificate of the device certificate associated with the device and the chain of trust.

Application certificate

A method of post-manufacture generation of the device certificatefor verifying an electronic deviceaccording to a public key infrastructure is provided. The method comprises obtaining, at a certificate generating apparatus, a first keyassociated with the device. A second keyfor the electronic device is derived from the first key. The device certificatefor the PKI is generated with the second key acting as the public keyassociated with the device certificate. In a corresponding way a private keyfor the PKI can be generated by the electronic devicebased on a shared first key. This approach enables the manufacturing cost for manufacturing an electronic device to be reduced whilst still enabling use of a PKI for attesting to properties of the device

Post-manufacture generation of device certificate and private key for public key infrastructure

A method of configuring a target domain providing a cryptographic identity for authenticating commands to be executed by an electronic device comprises receiving a domain configuration command, and authenticating the command based on a cryptographic identity provided by an authenticating domain which is an ancestor of the target domain in a hierarchical chain of trust. When authenticated, at least one target domain constraint specified by the command is combined with at least one future constraint specified by the authenticating domain to generate a combined constraint set to be satisfied by commands to be authenticated by the target domain. The combined constraint set is stored for the target domain. This approach provides a balance between security and scalability of the chain of trust.

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Cambridge, United Kingdom

John Dent