61. Quantum computing is a type of computation that harnesses the collective properties of
quantum states. The existence of the quantum computer seriously affects current
cryptographic primitives since there are some quantum algorithms that can break
hardness assumptions. Which one of the following cryptographic primitives can still be
used in the quantum era？
(A) RSA trapdoor permutation
(B) Diffie-Hellman key exchange protocol
(C) Digital Signature Algorithm
(D) SHA256
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