One-Time Pad is Only Known Unbreakable Encryption Method
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Open Question
The only known method of encryption which is (technically) unbreakable is the one-time pad.
It is an open question as to whether there exist any others.
Discussion
It is known that One-Time Pad is Unbreakable.
However, it has not been proved that there do not exist other methods of encryption that are also (technically) unbreakable.
We just have not actually found any yet.
Sources
- 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): one-time pad