+--------------------------------------------------+
| SHINIGAMI BEYONDORMASON |
| Gallente Capsuleer // Totient Reaper |
+--------------------------------------------------+

A dead ship drifted beside the gate.

No pilot.
No cargo.
No damage.

Only one line in local:

```
DO NOT DECODE THE WRECK
```

I scanned it anyway.

Inside the wreck was a number:

```
N = 91
```

The ship log said:

```
phi(91) = 72
91 = 7 * 13
key = 72
```

So I shifted every letter backward by 72.

The message became:

```
YOU ALREADY OPENED THIS
```

Then my overview changed.

One new contact appeared.

```
Shinigami Beyondormason
```

Same ship.
Same clone.
Same portrait.

Then the wreck broadcasted again:

```
N = 91
phi(N) = 72
pilot_count = 2
```

I checked local.

Only one pilot was there.

Me.

Then the other me typed:

```
DO NOT DECODE THE WRECK
```

+--------------------------------------------------+
| Encoding Rule: |
| Choose N = p*q |
| Compute phi(N) = (p-1)(q-1) |
| Shift the message by phi(N) mod 26 |
| If the text speaks back, do not undock again. |
+--------------------------------------------------+