be_quick_or_be_dead_1

be-quick-or-be-dead-1

Reversing - 200 points

Challenge

You find this when searching for some music, which leads you to be-quick-or-be-dead-1. Can you run it fast enough? You can also find the executable in /problems/be-quick-or-be-dead-1_4_98374389c5652d0b16055427532f098f.

Hint

Solution

Hopper decompiler

int main(int arg0, int arg1) {
    header();
    set_timer();
    get_key();
    print_flag();
    return 0x0;
}

Call the function directly in GDB

$ gdb be-quick-or-be-dead-1 

(gdb) break main
Breakpoint 1 at 0x40082b

(gdb) run
Starting program: /problems/be-quick-or-be-dead-1_4_98374389c5652d0b16055427532f098f/be-quick-or-be-dead-1 

Breakpoint 1, 0x000000000040082b in main ()

(gdb) call get_key()
Calculating key...
Done calculating key
$1 = 21

(gdb) call print_flag()
Printing flag:
picoCTF{why_bother_doing_unnecessary_computation_402ca676}
$2 = 59

Flag

picoCTF{why_bother_doing_unnecessary_computation_402ca676}