What are the key limiting factors for cryptography on low-power devices?

Low-power devices typically have limited processor speed, memory, and storage, meaning that encryption can be a challenge. Fortunately, solutions exist that implement low-power cryptographic processing capabilities, and continued advances in processor design continue to make lower-power processors faster and more efficient. Legal limitations don’t typically take into account whether a device is a low-power device, and public key encryption can be implemented on a wide range of CPUs and embedded systems, so factoring prime numbers is unlikely to be a problem.