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One-time pad

The only perfect cryptosystem!
The problem is that you need a shared key as large as the message.
Systems like advanced Encryption Standard allow us to encrypt things larger than the key, but the tradeoff is that they could be possibly broken, as don't have any provably secure symmetric-key algorithms as of 2020.

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  1. Symmetric-key algorithm
  2. Symmetric and public-key cryptography
  3. Cryptography
  4. Computer science
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