diff --git a/credsmanager.py b/credsmanager.py
new file mode 100644
index 0000000..8f9c992
--- /dev/null
+++ b/credsmanager.py
@@ -0,0 +1,102 @@
+from os.path import exists
+from enum import Enum
+from subprocess import Popen, PIPE
+from cryptography.fernet import Fernet
+import json
+
+
+class ReturnCode(Enum):
+    UNKNOW_ERROR = 0
+    REG_KEY_ERROR = 1
+    ADD_REG_KEY_ERROR = 2
+    DEL_REG_KEY_ERROR = 3
+    INVALID_PATH = 4
+    REG_KEY_DELETED = 5
+    
+
+
+class Cryptography():
+    def __init__(self, appname: str):
+        self.appname = appname
+
+        key = self.__get_key()
+        if type(key) is not bytes:
+            key = self.__create_key()
+            if type(key) is not bytes:
+                raise ReturnCode.REG_KEY_ERROR
+            
+        self.fernet = Fernet(key)
+
+    def __get_key(self):
+        try:
+            proces = Popen(f"reg QUERY HKEY_CURRENT_USER\{self.appname}", stdout=PIPE, stderr=PIPE) #Get key
+            if proces.stderr.read() !=b'':
+                return self.__create_key()
+            else:
+                return proces.stdout.read().decode("CP850").splitlines()[2].rsplit()[2].encode() #Return key as binary
+
+        except:
+            return ReturnCode.UNKNOW_ERROR
+
+
+    def __create_key(self):
+        try:
+            key = Fernet.generate_key()
+            proces = Popen(f"reg ADD HKEY_CURRENT_USER\{self.appname} /v fernkey /d {key.decode()}", stdout=PIPE, stderr=PIPE) #Add key in reg str
+            if proces.stderr.read() != b'':
+                return ReturnCode.ADD_REG_KEY_ERROR
+            return key
+        
+        except:
+            return ReturnCode.REG_KEY_ERROR
+
+    
+    def delete_key(self):
+        """Delete the key used for decryption, WARNING ONCE THE KEY IS DELETED ALL YOUR CRYPTED DATA ARE UNDECRYPTABLE AND LOST"""
+        try:
+            proces = Popen(f"reg DELETE HKEY_CURRENT_USER\{self.appname} /f", stdout=PIPE, stderr=PIPE)
+            stderr = proces.stderr.read()
+            if stderr != b'':
+                return ReturnCode.DEL_REG_KEY_ERROR    
+            return ReturnCode.REG_KEY_DELETED
+        
+        except:
+            return ReturnCode.UNKNOW_ERROR
+
+    def decrypt(self, data: bytes):
+        return self.fernet.decrypt(data)
+    
+    def encrypt(self, data: bytes):
+        return self.fernet.encrypt(data)
+    
+
+class Credentials():
+    def __init__(self, appname: str, credentials_path: str):
+        """Used to decode crypted credential csv files"""
+
+        if not exists(self.creds_path):
+            return ReturnCode.INVALID_PATH
+        
+        self.creds_path = credentials_path
+        self.crypt = Cryptography(appname)
+
+
+    def get_creds(self):
+        """Return the uncrypted version of the usernames and passwords as a list of tuple : [(username0, password0), (username1, password1), ...]"""
+        with open(self.creds_path, "rb") as f:
+            return json.loads(self.crypt.decrypt(f.read()).decode())
+
+
+    def write_creds(self, data: list[tuple[str, str]]):
+        with open(self.creds_path, "wb") as f:
+            f.write(self.crypt.encrypt(json.dumps(data).encode()))
+        return
+    
+    def add_cred(self, username: str, password: str):
+        """Add username and password to the crypted file"""
+
+        data = self.get_creds()
+        data.append((username, password))
+        self.write_creds(data)
+        return
+        
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