1. A system, comprising: one or more processors configured to: receive one or more challenge values from a first unit; perform a set of computations based at least in s art on the one or more challenge values; determine at least one result based at least in part on the set of computations; and provide the at least one result to a second unit; wherein the second unit is configured to: receive, from a third unit, a timing measure associated with the set of computations; generate an indication of a security posture based at least in part on an evaluation of the at least one result and the timing measure; provide the indication to a fourth unit, wherein the fourth unit is configured to perform an action based at least in part on the indication.