If the single, synchronized password is compromised (for example, if it is guessed, disclosed, determined by cryptanalysis from one of the systems, intercepted on an insecure communications path, or if the user is socially engineered into resetting it to a known value), all the systems that share that password are vulnerable to improper access. In most single sign-on and password vault solutions, compromise of the primary or master password (in other words, the password used to unlock access to the individual unique passwords used on other systems) also compromises all the associated systems, so the two approaches are similar.