Tags: pysym 

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Using pySym to solve the cipher by symbolically executing the python source: https://bannsecurity.com/index.php/home/10-ctf-writeups/44-tokyo-westerns-ctf-2017-my-simple-cipher

Original writeup (https://bannsecurity.com/index.php/home/10-ctf-writeups/44-tokyo-westerns-ctf-2017-my-simple-cipher).