Variable Shift Pseudorandom Number Generator for Leak Analysis Resistance

The patent applies dynamics by making the shift amount variable rather than fixed. The shift amount changing circuit dynamically adjusts the shift amount based on control signals, transforming a static system into a dynamic one. This resolves the contradiction by introducing variability that improves randomness and leak analysis resistance while adding only moderate circuit complexity through the shift amount changing circuit.

The patent changes the parameter of shift amount from a fixed value to a variable parameter controlled by external control signals. This parameter change enables the pseudorandom number generator to produce different sequences based on control inputs, significantly improving randomness and resistance to leak analysis while maintaining reasonable circuit complexity through efficient control mechanisms.

The patent applies preliminary action by providing initialization capability that can be activated before operation checks. The initialization circuit prepares the LFSR in a known state when needed, enabling operation check testing without requiring continuous initialization during normal operation. This resolves the contradiction by making initialization available on-demand rather than continuous.

The system allows the LFSR to maintain its state without continuous intervention, reducing power consumption during normal operation. When operation checks are needed, the initialization function is activated temporarily. This self-service approach lets the system operate efficiently most of the time while maintaining the capability to be reset when necessary.

The patent introduces dynamic clock control where different flip flop circuits receive clock signals with different phases or delays. This dynamic clocking strategy ensures that not all flip flops update simultaneously, creating varied output sequences that improve randomness while adding moderate complexity through clock signal management circuits.

The patent employs periodic action with different phases for clock signals supplied to various flip flop circuits. By staggering the clocking phases, the system ensures diverse update timing across the LFSR stages, generating more random output sequences. This periodic variation in clock timing improves randomness while maintaining structured control through phase-shifted clock distribution.