diff --git a/tools/anonymize_db.py b/tools/anonymize_db.py
index 2e5040a2..1d95a11b 100755
--- a/tools/anonymize_db.py
+++ b/tools/anonymize_db.py
@@ -33,7 +33,6 @@ Runned as user "scodoc" with scodoc and postgresql up.
 E. Viennet, Jan 2019
 """
 
-import os
 import psycopg2
 import sys
 import traceback
@@ -45,6 +44,13 @@ def log(msg):
     sys.stderr.flush()
 
 
+def usage():
+    sys.stdout.flush()
+    sys.stderr.flush()
+    print(f"Usage: {sys.argv[0]} [--users] dbname", file=sys.stderr)
+    sys.exit(1)
+
+
 # --- Fonctions d'Anonymisation, en SQL
 
 anonymize_name = "random_text_md5(8)"
@@ -52,15 +58,11 @@ anonymize_date = "'1970-01-01'"
 anonymize_question_str = "'?'"
 anonymize_null = "NULL"
 
-# aggregate_length = lambda column, _: 'length({})'.format(column)
-
-
 # --- Champs à anonymiser (cette configuration pourrait être placé dans
 #     un fichier séparé et le code serait alors générique pour toute base
 #      posgresql.
 #
 # On essaie de retirer les données personnelles des étudiants et des entreprises
-# TODO: L'identité (login) des enseignants n'est pas modifiée
 #
 #
 ANONYMIZED_FIELDS = {
@@ -102,17 +104,23 @@ def anonymize_column(cursor, tablecolumn):
     remplacé par nom_valeur_de_la_clé.
     """
     table, column = tablecolumn.split(".")
-    anonymization = ANONYMIZED_FIELDS[tablecolumn]
-    log("processing {}".format(tablecolumn))
-    cursor.execute(
-        "UPDATE {table} SET {column} = {value};".format(
-            table=table,
-            column=column,
-            value=anonymization(column, key_name)
-            if callable(anonymization)
-            else anonymization,
-        )
-    )
+    anonymized = ANONYMIZED_FIELDS[tablecolumn]
+    log(f"processing {tablecolumn}")
+    cursor.execute(f"UPDATE {table} SET {column} = {anonymized};")
+
+
+def anonymize_users(cursor):
+    """Anonymise la table utilisateurs"""
+    log("processing user table")
+    cursor.execute("""UPDATE "user" SET email = 'x@y.fr';""")
+    cursor.execute("""UPDATE "user" SET password_hash = '*';""")
+    cursor.execute("""UPDATE "user" SET password_scodoc7 = NULL;""")
+    cursor.execute("""UPDATE "user" SET date_created = '2001-01-01';""")
+    cursor.execute("""UPDATE "user" SET date_expiration = '2201-12-31';""")
+    cursor.execute("""UPDATE "user" SET token = NULL;""")
+    cursor.execute("""UPDATE "user" SET token_expiration = NULL;""")
+    cursor.execute("""UPDATE "user" SET nom=CONCAT('nom_', id);""")
+    cursor.execute("""UPDATE "user" SET prenom=CONCAT('nom_', id);""")
 
 
 def anonymize_db(cursor):
@@ -121,21 +129,32 @@ def anonymize_db(cursor):
         anonymize_column(cursor, tablecolumn)
 
 
-dbname = sys.argv[1]
+process_users = False
+if len(sys.argv) < 2 or len(sys.argv) > 3:
+    usage()
+if len(sys.argv) > 2:
+    if sys.argv[1] != "--users":
+        usage()
+    dbname = sys.argv[2]
+    process_users = True
+else:
+    dbname = sys.argv[1]
 
-log("\nAnonymizing database %s" % dbname)
+log(f"\nAnonymizing database {dbname}")
 cnx_string = "dbname=" + dbname
 try:
     cnx = psycopg2.connect(cnx_string)
-except:
-    log("\n*** Error: can't connect to database %s ***\n" % dbname)
-    log('connexion string was "%s"' % cnx_string)
+except Exception as e:
+    log(f"\n*** Error: can't connect to database {dbname} ***\n")
+    log(f"""connexion string was "{cnx_string}" """)
     traceback.print_exc()
 
 cnx.set_session(autocommit=False)
 cursor = cnx.cursor()
 
 anonymize_db(cursor)
+if process_users:
+    anonymize_users(cursor)
 
 cnx.commit()
 cnx.close()