Final answer:
SIMON and SPECK algorithms are the cryptographic standards best suited for IoT devices due to their balance between security and low resource usage.
Step-by-step explanation:
The cryptographic algorithm standard best suited for Internet of Things (IoT) devices, known for being lightweight, is D) SIMON and SPECK. These algorithms were specifically designed by the National Security Agency (NSA) for resource-constrained devices such as those used in IoT applications. They provide a balance between security and performance, taking into account the limited computing power and energy resources of IoT devices.
While algorithms like RSA and ECC (Elliptic Curve Cryptography) are secure, they require more computational resources and are thus not as well-suited for small, low-power devices. AES (Advanced Encryption Standard) is also secure and efficient, but SIMON and SPECK have been developed to perform even better in environments where processing power, code size, and memory are significantly constrained.