Radix_s_Terminal

Radix's Terminal

Reversing - 400 points

Challenge

Can you find the password to Radix's login? You can also find the executable in /problems/radix-s-terminal_1_35b3f86ea999e44d72e988ef4035e872?

Hint

https://en.wikipedia.org/wiki/Base64

Solution

Open in Hopper Decompiler

int check_password(int arg0) {
    // lots of code

    eax = strncmp(var_20, "cGljb0NURntiQXNFXzY0X2VOQ29EaU5nX2lTX0VBc1lfMTg3NTk3NDV9", var_28);
    ebx = *0x14 ^ *0x14;
    if (ebx != 0x0) {
            eax = __stack_chk_fail();
    }
    return eax;
}

Decode using base64

cGljb0NURntiQXNFXzY0X2VOQ29EaU5nX2lTX0VBc1lfMTg3NTk3NDV9

Flag

picoCTF{bAsE_64_eNCoDiNg_iS_EAsY_18759745}