Abstract: Systems and methods herein secure computer memory from potential hacks. In one embodiment, a system includes a computer memory, and a memory protection module communicatively coupled to the computer memory. The memory protection module is operable to assign a counter value to a write Input/Output (I/O) request, to encrypt data of the write I/O request based on the counter value, and to write the encrypted data to a location of the computer memory. The counter value comprises a version number of the write I/O request and, for example, the location of the computer memory to where the data of the write I/O request is being written in the computer memory. The memory protection module is further operable to compute the version number based on memory access patterns of an application writing to the computer memory.

Abstract: Subsets of multiple signal generator circuits embodied in a device are selected, and then a volatile value for the device is generated from the selected subsets. The volatile value may be used for authentication of the device and/or for cryptographic procedures performed on the device. The signal generator circuits may each comprise an oscillator circuit, and the selection of the subsets may be according to a comparison of the outputs of the subsets of circuits, for example, according to a comparison of output oscillation frequencies.