The "Interesting" input This binary asked for some input to generate the flag. A sym.check function shines in main:
This function has 3 important parts: A check for length of the password which should be at least 0x13 or 19 characters, as shown in the figure with number 1. First four letters, indicated by 2 in the figure, implying a password starting with aqua. A for loop indicated by 3 in the figure, which is almost the most challenging (still trivial) part. ...