The differential power analysis (DPA) has become a big threat to crypto chips since it can efficiently disclose the secret key without
much effort. Several methods have been proposed in literatures to resist the DPA attack, but they largely increase the hardware cost
and severely degrade the throughput. In this brief, a security problem based on ring oscillators is resolved by a new architecture with
self-generated true random sequence. The true random-based architecture is implemented with an Advanced Encryption Standard
(AES) crypto engine. But the power overhead is high. To reduce this power overhead Bit Swapping LFSRs was introduced in the True
Random Based Architecture. The proposed Low Power DPA countermeasure circuit reduces the power consumption upto 75%
without throughput degradation.