The hardest thing is to use a hexadecimal input. Most on-line sites deal only with text. Exception: https://emn178.github.io/online-tools/sha256.html
Summing Digits within Text
Implement a ROT13 cipher
pressure to dB?
Project Euler: Problem 5, Smallest multiple
Optimal Asymmetric Encryption Padding decoding of message for RSA Cryptography
AES SubBytes() Transformation
Binary Array to Hex Representation
Convert Thermocouple output voltage (in mV) to Temperature (in C)
Radioisotope Thermoelectric Generator (RTG)
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