Too easy

hint: use gdb or other debuggers

this will be very difficult and annoying if you have an arm processor

Thank you!

just too weak. change to ez insteed

Hint: find where in memory is the correct pin, and make sure you translate it to the correct base

its simple but good

I took me way too long, mainly because I was using wrong disasm tool (cutter). With IDA it was immediately solved.

Well, maybe easy for someone who knows what they are doing, but for someone starting from 0, this is great place to learn, even if I start from basics and do it in dumb way (ni and info).

IDA free version worked great

Or you can use Snowman

Nice beginner CTF

good for beginner

For this challenge, I motivated myself to use ghidra for the first time.

Conclusion: the decompiler makes this easy. :)

I'm using Ghidra. Noticed the valid variable being used, but can't find it's value. Help?

Hint 1: SXQgaGFzIGEgY29tbWVudCBvbiB0aGUgcmlnaHQgZnJvbSB3aGVyZSBpdCdzIHVzZWQuIFlvdSBjYW4gYWxzbyBjbGljayB0aGUgdmFyaWFibGUgdG8gZ28gdG8gaXRzIGRlZmluaXRpb24u Hint 2: VGhlICdoJyBhdCB0aGUgZW5kIG1lYW5zIHRoYXQgaXQncyBoZXhhZGVjaW1hbC4=

I think these are good hints.