Criticisms
The term enterprise reduced sign-on is preferred by some authors who believe single sign-on to be impossible in real use cases.
As single sign-on provides access to many resources once the user is initially authenticated ("keys to the castle"it increases the negative impact in case the credentials are available to other persons and misused. Therefore, single sign-on requires an increased focus on the protection of the user credentials, and should ideally be combined with strong authentication methods like smart cards and one-time password tokens.
Single sign-on also makes the authentication systems highly critical; a loss of their availability can result in denial of access to all systems unified under the SSO. SSO can thus be undesirable for systems to which access must be guaranteed at all times, such as security or plant-floor systems.
Read more about this topic: Single Sign-on
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