攻防世界MISC_4-2

环境

题目下载，字频分析

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flag{classical-cipher_is_not_security_hs}

wp

quipqiup在线

In cryptography a substitution cipher is a method of encoding by which units of plaintext are replaced with ciphertext If you know the way of encoding u will get the flag which is classical-cipher_is_not_security_hs