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722eebd · Jun 19, 2023

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kcpassword

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Jun 19, 2023

kcpassword

Level - Easy

Description:

I'm too lazy to log into my Mac each time, so I enabled auto-logon. It's okay though because I'm sure that Apple will protect my password sufficiently...

[kcpassword]

Writeup

When enabling auto-logon on a Mac, the OS will take your password, XOR it with a static key, and store it in the kcpassword file. To decrypt, simply XOR it with the static key again (https://github.com/Heisenberk/decode-kcpassword/blob/master/decode-kcpassword.py).

Flag - byuctf{wow_Macs_really_have_it_encrypted_with_a_static_key_lol}