A Study on Output Bit Tampering of True Random Number Generators Using Time-Varying EM Waves

True random number generators (TRNGs) based on ring oscillators are employed in many devices because they can be constructed with logic gates only. If the randomness is degraded by the attack, it may affect the security of the cryptographic protocol. As a physical attack against TRNG, several attack methods that reduce its randomness have been proposed. On the other hand, TRNG is recommended to im...