This document proposes a one-time password (OTP) authentication scheme based on elliptic curves for Internet of Things (IoT) devices. It uses identity-based elliptic curve cryptography to design an OTP generation scheme based on Lamport's OTP algorithm. This proposed scheme requires fewer resources than existing schemes due to using a smaller key size and less infrastructure. Future work could explore using different prime numbers for encryption in satellite communications up to 128 bits. The document provides background on elliptic curves, Diffie-Hellman key exchange, and references for further reading.