Develop a communications security architecture incorporating cryptographic security mechanisms that efficiently support the provision of required integrity, authentication, and confidentiality security services within distributed networks of resource

通过用户登录验证，可以对通讯录进行添加，删除，更新等功能-Through the user login authentication, address book can add, delete, update, etc.

通过用户名的验证，对通讯录进行添加，删除，更新等功能-Authentication by user name, the address book to add, delete, update, etc.