Mitigation of offline ciphertext-only attacks

Abstract

Disclosed herein are system, method, and computer program product embodiments for mitigating offline decryption attacks of ciphertext. An embodiment operates by inputting plaintext into an encryptor, writing ciphertext output from the encryptor into memory, inputting the ciphertext from memory into a noise generator, outputting ciphertext from memory to an output device in response to receiving a first timing signal from a timer, and outputting noise data generated by the noise generator to the output device in response to receiving a second timing signal from the timer. The output device may be a node in a distributed ledger, in some embodiments. The distributed ledger may include a blockchain, for example. Using techniques disclosed herein, encryption may be strengthened to thwart attempts by untrusted third-party attackers to crack encryption, e.g., of information that is sensitive and/or confidential, even when they use significant computational resources separate from host computers of legitimate parties.