Information handling system secure keyboard health state tracking for enhanced reuse and recycling
A key input counter stored in non-transitory memory coupled to a keyboard membrane and executing on a processing resource of the keyboard membrane stores a number of key presses detected at the membrane to track health of the keyboard for reuse. Key input values are queued in batches of sufficient size so that communication to non-transitory memory hides inputs made by an end user, such as a password input. In some embodiments, the batches are copied to non-transient memory when a sufficient multiple of a password exists to mask the password value, or when a sufficient amount of time passes to break up any end user key input sequences. In one embodiment, key values are tracked for less than all the keys to prevent malicious reading of key inputs while still tracking particular values for end of life numbers of key inputs.
1 . An information handling system comprising:
a housing having an interior;
a motherboard coupled in the housing interior;
a processor coupled to the motherboard and operable to execute instructions that process information, including at least instructions that apply passwords of a maximum length;
a memory coupled to the motherboard and interfaced with the processor, the memory operable to store the instructions and information;
a keyboard coupled over the housing interior, the keyboard having plural keys that press against a membrane that detects key presses, the membrane including a processing resource interfaced with the processor to communicate key input values to the processor and a non-transitory memory; and
a key input counter having instructions stored in the non-transitory memory that, when executed on the processing resource cause:
counting of key presses in a queue of a predetermined size, the queue inaccessible to the processing resource until the queue is full, the queue predetermined size at least longer than a maximum length of passwords used by the processor; and
storing the count of key presses from the queue into the non-transitory memory in batches of a predetermined number of key presses for each of plural key values as a total number of each of the plural key values without a sequence of the plural key value inputs to hide the key value inputs when the key press values are read external to the keyboard.
2 . The information handling system of claim 1 further comprising:
a buffer coupled to the membrane;
wherein the buffer stores the queued batches inaccessible to the processing resource until the buffer fills.
3 . The information handling system of claim 1 wherein the key input counter instructions further:
store a total number of key presses; and
store key values associated with a number of key presses for each of only a subset of the plural keys.
4 . The information handling system of claim 3 wherein the subset of the plural keys includes a space bar key and excludes at least one letter key.
5 . The information handling system of claim 3 wherein the subset of the plural keys are letters QWERTASDFGZXCVB and space bar.
6 . The information handling system of claim 1 wherein the batches of the predetermined number of key presses are stored based at least upon a minimum time between batches.
7 . The information handling system of claim 6 wherein the batches of key input values are stored when both a minimum time and a minimum number of key input values are detected.
8 . The information handling system of claim 1 wherein the key input counter instructions further reorder the key input values when storing the input values from the queue to the non-transitory memory.
9 . The information handling system of claim 1 wherein the batches each have a minimum number of key inputs of at least ten times a maximum password input value.