The logic is simple: In the English language, the letter 'E' is the most frequently used letter, accounting for roughly 12-13% of all characters in a standard text. Other letters, like 'Z', 'Q', and 'X', are exceedingly rare.
Assign tentative plaintext values to the highest-frequency ciphertext letters. asc substitution crack
Cipher: 0x42 → 0x4A Plain: B → J Mapping: J = B (offset +8 or arbitrary lookup) The logic is simple: In the English language,