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Post-quantum security of multiple-encryption with CTR mode of operation while keeping the IVs secret

pf flag

I received an answer in one of my questions saying that multiple-encryption with CTR mode of operation is vulnerable to a sort of meet-in-the-middle attack if the IVs are public. The same user said that keeping the IVs secret such attack not applies and that the cost of breaking a double-encryption with brute-force for example is multiplied by 2*[IV lenght].

Does encrypting two times with CTR mode while keeping the IVs secret suffer from some kind of attack in the quantum model such as Grover's algorithm?

Paul Uszak avatar
cn flag
Yet if the IVs are secret, how would you decrypt?
phantomcraft avatar
pf flag
@PaulUszak I mean, obviously, secret from the others,
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