# À l'aube d'un échange

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**Category:** Renseignement en sources ouvertes - **Points:** 549 - **Difficulty :** Moyen - **Solves :** 709

**Description:**\
Nouvelle recrue ! Nous avons besoin de toi par ici. Un de nos agents vient d'intercepter une courte conversation téléphonique entre deux agents de **Hallebarde**. Un important échange de documents confidentiels doit avoir lieu et pour indiquer l'endroit du rendez-vous, l'un des agents ennemis a envoyé la photo ci-dessous à son collègue tout en précisant ceci :

> Quel beau lever de soleil n'est-ce pas ? J'attendrai dans la rue qui sépare le bâtiment au premier plan de ceux au second plan. Rendez-vous ce soir, 22h00.

Nous avons moins d'une journée pour découvrir le nom de ladite rue et empêcher l'échange !\
Format du flag : `404CTF{md5 du nom complet de la rue}`\
Le nom de la rue doit être en **minuscule**, inclure le **type de rue** ( ex : avenue, rue, boulevard... ), **sans accents**, **sans abréviation**, **et tous les espaces doivent être remplacés par des tirets**.\
Par exemple : si la rue est l'Avenue de Saint-Mandé à Paris, le flag correct est 404CTF{129af9edde5659143536427f9a5f659a}.

**Solution:**\
To solve this challenge you need to find the place where the photo was taken.\
However, it was not easy to find one's position with the reflections of the sun reducing visibility.\
But in the background of the image, we can see a tower with a "leaning" roof close to another tower with a pointed roof.\
We will therefore begin our research with these elements. After much research (and patience) we find that this landscape is in Lyon.\
Indeed the tower with the "leaning" roof is the **Incity** tower and the tower with the pointed roof is the **Part-Dieu** tower.\
With this very interesting and useful information, we now have to find the point where the photo was taken.\
To do this, I used Google Earth in 3D mode and after several hours of research, I found the zinc roof that we can see at the very bottom of the image.\
And there we had to test all the surrounding streets and avoid the pitfalls...\
(*What is visible is not necessarily what you think*, a great phrase to remember).\
So after research the street was : *Mtn Saint-Barthélémy* with *Mtn* who correspond to *Montée*.\
With the challenge description we remove accents, spaces and abbreviations before converting to MD5.\
So at the end, we get *montee-saint-barthelemy* and his MD5 is the flag.

<details>

<summary>🚩 FLAG</summary>

```
404CTF{eb66c65861da9fe667f26667b3427d2c}
```

</details>


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