Some cryptographers are looking for RSA replacements because the algorithm is just one encryption algorithm that may be vulnerable to new machines that exploit quantum effects in electronics.

Judy ** RSA is the best possible type of public key cryptography, yet due to the high computation involved it is often not used to encrypt/decrypt simple messages.

A quantum computer with a million qubits would be able to crack the vital RSA encryption algorithm, and while such machines don't yet exist, that estimate could still fall further ...