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One Time Pads
One time pads are also Vernam ciphers that use a stream of truly random key bits and XOR with the plaintext.
Claude Shannon (the noted Bell Labs researcher, the “father of information theory”) was able to prove that one-time pads are unbreakable
Notes:
Even if aliens land in UFOs bring computers 10 billion-trillion times as fast as what we have, one time pads are still unbreakable. Since a ciphertext is just as likely to decrypt to ANY plaintext, the unicity distance of a one time pad is infinite.