Why RSA was cracked
RSA is based on the problem of large integer factorization. Quantum computers use the Shor algorithm to decompose large numbers in polynomial time, rendering RSA encryption useless.
The Current Status of Quantum Computing
It is still the NISQ era, with fewer qubits and higher error rates. There is still a distance to go from practical quantum computers, but they are developing rapidly.
post quantum cryptography
NIST has selected the standard for a new quantum resistant encryption algorithm. We need to start migrating now, otherwise it will be too late for quantum computing to mature.
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