Question: Consider the following cipher: the plaintext M 1 M 2 . . . Ml is a string of numbers in [ 0 . . 2

Consider the following cipher: the plaintext M1M2... Ml is a string of numbers in [0..25], the key is a sequence of numbers K1K2... Kl, each Ki is uniformly randomly chosen from [0..51], the ciphertext is C1C2... Cl, where Ci =(Mi + Ki mod 26). Each key is used only once. Does this cipher provide perfect secrecy?

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