Revert "temporarily rollback stronger encryption"

This reverts commit 268f5aa6.

autovpn/vpn_app.py

@@ -45,13 +45,11 @@ key %(cn)s.key
 crl-verify crl.pem
 ns-cert-type server
 tls-auth tlsauth.key 1
+auth SHA512
+cipher AES-256-CBC
+tls-version-min 1.2 or-highest
+tls-cipher TLS-DHE-RSA-WITH-AES-256-GCM-SHA384
 '''
-# TODO(shammash): riabilita quando i manuali sono aggiornati.
-#auth SHA512
-#cipher AES-256-CBC
-#tls-version-min 1.2 or-highest
-#tls-cipher TLS-DHE-RSA-WITH-AES-256-GCM-SHA384
-#'''
 
 TBLK_PLIST_TEMPLATE = '''<?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "https://www.apple.com/DTDs/PropertyList-1.0.dtd">