# Back to the Lab 1

## Problem

We've gotten hold of the plant control program, but the MELTDOWN button is locked. Figure out the flag and press the button!

Note: To run the program, you'll have to press the Run button in the upper left of the window. Press the Abort button to stop it.

Note: To run the program, you'll need some rather expensive software; look for the "community edition", it's free. It's bulky, so maybe consider installing on a VM.

Author: nb

## Solution

The source code given is a LabVIEW file. Open it using LabVIEW Community.

![](https://3167364547-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MX1bWRlBzHpEPe1TYDD%2Fuploads%2Fgit-blob-45d74a2ded057727ebb37694e1f0db244bba5453%2F298a8073ff7a48719e0ee70d8743a813.png?alt=media)

For substring (0, 19), its XOR with 5 is compared with `AdrbFQC~hwZGPWK0Zop`.

For the rest, `0xA` is subtracted from it and compared with `s:)DHK8Uj&]Uj+`. The string is also reversed.

```python
first_part = 'AdrbFQC~hwZGPWK0Zop'
second_part = 's:)DHK8Uj&]Uj+'

for char in first_part:
    print(chr(ord(char) ^ 5), end='')

result = ''
for char in second_part:
    result += chr(ord(char) + 0xA)

print(result[::-1])
```

![](https://3167364547-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MX1bWRlBzHpEPe1TYDD%2Fuploads%2Fgit-blob-dbc550c8c9ffe3a312aa13d03e0c26184eb5bcc4%2F8ca9500a9d59492298e4da6fd4d7624b.png?alt=media)