Pin

DESCRIPTION : Can you crack my pin?

Basic Info

File command

It is 64 Bit elf binary

Strings command

There is some interesting strings.

Run the binary

• It ask for the pin
• Then print PIN salah ( wrong pin )

Ltrace command

There is no interesting libraries call like strcmp

Let's analysis the binary in GDB

• Disassemble the main function
• It print the "Masukan PIN = "
• Then ask for the pin
• It call the cek function with argument of input

• Disassemble the cek function
• It compare the input with some value.
• Let's find the value by setting breakpoint at cmp statement

• Let's find the value
• Breakpoint hits, examine the value of eax
• The value of eax register is 333333

Yeah!!!! The pin is 333333.

The flag is CTFLearn{333333}