Which possible Attacks in Quantum Cryptography can take place?

Question

Which possible Attacks in Quantum Cryptography can take place?

A. Possible Attacks in Quantum Cryptography and Birthday Attack

B. Birthday attack and Boomerang attack

C. Brute force attack and Faked-State-Attack

D. Possible Attacks in Quantum Cryptography and Faked-State Attack

Photon Number Splitting (PNS) Attack:
As we know that it is not possible to send a single photon thus a pulse is sent. So, some of the photons from a pulse can be captured by Eve and after matching bits by Amit and Bobby, Eve can use the same polarizer as done by Bobby and thus get the key without being detected in cryptography.
Faked-State Attack: Mainly, Eve uses a replica of Bob’s photon detector and thus captures the photons intended for Bobby and further passed it to Bobby. Thus, Eve knows about the encoded bit, Bobby thinks that he received it from Amit.

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A key is a string of bits used by a cryptographic algorithm to transform plain text into ciphertext. Which of the following is capable of becoming a key in a cryptographic algorithm?

A. An integer values

B. A square matrix

C. An array of characters (i.e. a string)

D. All of the above

Which possible Attacks in Quantum Cryptography can take place?

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