> For the complete documentation index, see [llms.txt](https://writeups.adityadindi.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://writeups.adityadindi.com/crackmes.one/1-difficulty-rating/untitled.md).

# Easy Keyg3nme

![](/files/-MfYL7ok_7UlKBy4KbIe)

Lets download the zip file and unzip it. (Password: crackmes.one)

![](/files/-MfYLNQ5KoqoINUPLWXY)

Lets run the file

![](/files/-MfYLeViNzJ5pywSJuN0)

Its asks for a key, and it looks like if we type in the wrong key, its gives us a response saying `nope`.

Lets look at the file into more detail with the `strings` command

![](/files/-MfYLvIhRWwxMr1CMF2n)

Ok so it looks like we will get a message saying `Good job mate, now go keygen me` if we give it the right key. Lets open the file with `gdb` and look at the functions

![](/files/-MfYMGzTNa1Or097cCrF)

Lets look at the main function by disassembling it

![](/files/-MfYMUZa8hBfi-HRkiQG)

We are calling the `validate_key` function, lets check it out

![](/files/-MfYMfUetWODNdTlNqWg)

This line is the most interesting , we are using the `imul` instruction. Lets see what it does on google

![](/files/-MfYN10nJkj-v6tbPMac)

So it multiplies the integers, so in the screenshot above, we are multiplying `eax` with itself, and the value being `0x4c7` which is also `1223` in decimal

![](/files/-MfYNSfzI83e0n8OHS4d)

So lets try entering `1223` as the key or any multiple of 1223 as the key as we are multiplying it by itself and storing it in a variable that is the valid key.

![](/files/-MfYO8iQQitrUJVb_Nha)

We have the answer


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://writeups.adityadindi.com/crackmes.one/1-difficulty-rating/untitled.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.