diff --git a/src/parallel/app.py b/src/parallel/app.py
new file mode 100644
index 0000000..9755ada
--- /dev/null
+++ b/src/parallel/app.py
@@ -0,0 +1,72 @@
+#!/usr/bin/python3
+"""
+Serveur Flask pour entraîner le réseau sur plusieurs machines en parallèle.
+"""
+import os
+import random
+from secrets import token_urlsafe
+
+from flask import Flask, request, send_file
+
+from clients import Client, clients
+
+DATASET = "mnist-train"
+SECRET = str(random.randint(1000, 10000))
+CACHE = ".cache"
+
+os.makedirs(CACHE, exist_ok=True)
+
+app = Flask(__name__)
+print(f" * Secret: {SECRET}")
+
+@app.route("/authenticate", methods = ['POST'])
+def authenticate():
+    """
+    Authentification d'un nouvel utilisateur
+    """
+    if not request.is_json:
+        return {
+            "status":
+            "request format is not json"
+        }
+    content = request.get_json()
+    if content["secret"] != SECRET:
+        return {"status": "invalid secret"}
+
+    performance = content["performance"]
+    token = token_urlsafe(30)
+
+    while token in [client.token for client in clients]:
+        token = token_urlsafe(30)
+
+    clients.append(Client(performance, token))
+
+    data = {}
+    data["token"] = token
+    data["nb_elem"] = performance
+    data["start"] = 0
+    data["dataset"] = DATASET
+    data["status"] = "ok"
+
+    return data
+
+
+@app.route("/get_network")
+def get_network():
+    """
+    Renvoie le réseau neuronal
+    """
+    if not request.is_json:
+        return {
+            "status":
+            "request format is not json"
+        }
+    token = request.get_json()["token"]
+    if token not in [client.token for client in clients]:
+        return {
+            "status":
+            "token invalide"
+        }
+    return send_file(
+        os.path.join(CACHE, "reseau.bin")
+    )
diff --git a/src/parallel/client.py b/src/parallel/client.py
new file mode 100644
index 0000000..e74adb3
--- /dev/null
+++ b/src/parallel/client.py
@@ -0,0 +1,86 @@
+#!/usr/bin/python3
+"""
+Client se connectant au serveur Flask afin de fournir de la puissance de calcul.
+"""
+import json
+import os
+import sys
+
+import psutil
+import requests
+
+CACHE = ".cache"
+DELTA = os.path.join(CACHE, "delta_shared.bin")
+RESEAU = os.path.join(CACHE, "reseau_shared.bin")
+SECRET = input("SECRET : ")
+HOST = input("HOST : ")
+os.makedirs(CACHE, exist_ok=True)
+
+
+def get_performance():
+    """
+    Renvoie un indice de performance du client afin de savoir quelle quantité de données lui fournir
+    """
+    cores = os.cpu_count()
+    max_freq = psutil.cpu_freq()[2]
+    return int(cores * max_freq * 0.01)
+
+
+def authenticate():
+    """
+    S'inscrit en tant que client auprès du serveur
+    """
+    performance = get_performance()
+    data = {
+        "performance":performance,
+        "secret": SECRET
+    }
+    req = requests.post(
+        f"http://{HOST}/authenticate",
+        json=data
+    )
+    data = json.loads(req.text)
+    if data["status"] != "ok":
+        print("authentication error:", data["status"])
+        sys.exit(1)
+    else:
+        return data
+
+
+def download_network(token):
+    """
+    Récupère le réseau depuis le serveur
+    """
+    data = {"token": token}
+    with requests.get(f"http://{HOST}/get_network", stream=True, json=data) as req:
+        req.raise_for_status()
+        with open(os.path.join(CACHE, RESEAU), "wb") as file:
+            for chunk in req.iter_content(chunk_size=8192):
+                file.write(chunk)
+
+
+
+def train_shared(dataset, start, nb_elem, epochs=1, out=DELTA):
+    """
+    Entraînement du réseau
+    """
+    raise NotImplementedError
+
+
+def __main__():
+    data = authenticate()
+
+    token = data["token"]
+    dataset = data["dataset"]
+
+    start = data["start"]
+    nb_elem = data["nb_elem"]
+
+    download_network(token)
+
+    while True:
+        train_shared(dataset, start, nb_elem, epochs=1, out=DELTA)
+
+
+if __name__ == "__main__":
+    __main__()
diff --git a/src/parallel/clients.py b/src/parallel/clients.py
new file mode 100644
index 0000000..0ead573
--- /dev/null
+++ b/src/parallel/clients.py
@@ -0,0 +1,15 @@
+#!/usr/bin/python3
+"""
+Description des clients se connectant au serveur.
+"""
+
+class Client():
+    """
+    Classe client
+    """
+    def __init__(self, performance, token):
+        self.performance = performance
+        self.token = token
+
+
+clients = []