Cracking

What do we need to enter to validate ? The raw string that gives me a correct message with ch29.bin doesn’t seem to be accepted.
Thanks

Hello,

I think I have the same issue:
I found a string for which ch29.bin prints "Good.", but this string is not accepted as a solution.
If there is something more to do ?

EDIT (slight spoil) : Actually several input strings are accepted by the binary, one of them is the flag.

Thanks (this challenge is great so far 😉 )