Single sign-on process allowing a mobile user with a mobile phone or with a laptop to remote-access a remote server, comprising the steps of: (1) sending a first authenticator over a first communication layer to a first intermediate equipment between said mobile equipment and said remote server, (2) verifying in said first intermediate equipment said first authenticator sent by said mobile equipment, (3) if said first authenticator is accepted by said first intermediate equipment, completing the communication layer between said mobile equipment and said intermediate equipment, (4) repeating steps (1) to (3) with a plurality of successive intermediate equipment and over a plurality of successive communication layers, until a communication has been completed at the last requested communication layer between said mobile equipment and said remote server, wherein at least a plurality of said authenticators are furnished by a smart-card in said mobile equipment.