Random bit sequences are key ingredients of various tasks in modern life and especially in secure communication.

In a new study researchers have determined that generating true random bit sequences, classical or quantum, is an impossible mission.

Based on these findings, they have demonstrated a new method of classified secure communication.

The mathematical definition of a random bit sequence is so simple that it can be summarized in one sentence: A sequence of bits whose next bit is equal to 0 or 1 with equal probability, independent of previous ones.

Although the definition is very simple, the practical certification of a process as random is much more complicated but crucial, for example, in secure communication, where information must be scrambled in order to prevent hackers from predicting a bit stream.

In an article to be published on November 5, 2019 in the journal Europhysics Letters, researchers at Bar-Ilan University demonstrate that long sequences with certified randomness by the US National Institute of Standard and Technology (NIST) are far from being truly random.

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