Continuous authentication confidence module

A method comprising:

• determining, in a trusted execution environment (TEE) of a computing device, a confidence score in response to an initial authentication of a specific user to the computing device, the confidence score to indicate a current strength of authentication at a point in time during a session established between the computing device and a remote communication partner;
• selecting, in the TEE, a type of presence data for use to update the confidence score based, at least in part, on a level of the confidence score and when the confidence score is at or above a confidence score power threshold, selecting the type of presence data based at least in part on a power consumption associated with acquisition of the selected type of presence data;
• updating, in the TEE, the confidence score based, at least in part, on at least one of an expectation of user presence and the selected type of presence data;
• and
• notifying the remote communication partner that the authentication is no longer valid if the updated confidence score is within a tolerance of a session close threshold.

At least one non-transitory computer readable storage medium comprising instructions that when executed enable a system to:

• determine, in a trusted execution environment (TEE) of the system, a confidence score in response to an initial authentication of a specific user to the system, the confidence score to indicate a current strength of authentication at a point in time during a session established between the system and a remote communication partner;
• select, in the TEE, a type of presence data for use to update the confidence score based, at least in part, on a level of the confidence score and when the confidence score is at or above a confidence score power threshold, select the type of presence data based at least in part on a power consumption associated with acquisition of the selected type of presence data;
• update, in the TEE, the confidence score based, at least in part, on at least one of an expectation of user presence and the selected type of presence data;
• and
• notify the remote communication partner that the authentication is no longer valid if the updated confidence score is within a tolerance of a session close threshold.