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It depends on the time you want to spend. But most likely, there is nothing with reasonable efficiency. For arithmetic operations, humans are really bad compared to computers, and the difference is at least a factor of $10.000.000$ (very very rough guess, probably even 1+ additional zeros there). So, since you have to assume that the attacker has access to ...


Given that you have parts of the plain text and its corresponding ciphertext, this is called a known plaintext attack. Given an affine cipher that has a key that is composed of 2 parts $a$ and $b$, you can express it as a system of 2 equations with 2 unknown. Assuming the usual mapping $\mathtt{a} \to 0$, $\mathtt{b} \to 1$, etc., you need to solve the ...

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