Are today’s quantum computers capable of breaking encryption algorithms?

The threat that quantum computing poses is to the security of public key algorithms. Most symmetric, cryptographic algorithms and hash functions are believed to be relatively secure against attacks by quantum computers. 

To break current cryptographic systems, quantum computers must have between 500 and 2,000 qubits, which depends on the algorithm key length. However, existing quantum computers that we know only operate with less than 15 qubits at present.

Kevin Curran IEEE Senior Member

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