Tags: binary
Rating: 4.0
Hints are very helpful in this ctf. So you will simply realize that program doesn't accept over limited digits. We know its around 2,1 billion that limit a int value can store. The Further more integer can convert to negative number AKA "Integer overflow"
An integer overflow can cause the value to wrap and become negative,
which violates the program's assumption and may lead to unexpected behavior
(for example, 8-bit integer addition of 127 + 1 results in −128, a two's complement of 128).
So my sloution was:
when you run it on server side : Flag:
actf{signed_ints_aint_safe}