Electrical appliances become to handle digital data and are connected to a network in late years. They are exposed to threats same as PCs by connecting to a network. Then the authentication of electric appliances is effective to keep them from security. Especially appropriate authentication is necessary to prove safety margin as electric appliances used in our daily life. Usages of the authentication method are different by equipping of the appliance's function and connecting style of network. Many kinds of authentication technology and single-sign-on function are available and adaptable for a authentication for electric appliances. High security and wide-use of authentication is necessary to use it in applications by many kinds of electric appliances.
