SFGACS includes four parts: SOAP protocol system, user authentication system, certificate system and authorization filtrating system.

SFGACS包括SOAP协议系统、用户认证系统、证书系统和授权过滤系统等四个部分。

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The system login uses information such as source ID (SID), domain and system user name for authentication, so it is considered secure.

系统登录会使用到诸如源 ID（安全识别符），域和系统用户名等信息进行身份验证，因此被认为是安全的。

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Authentication information is registered with the federated system as user mappings.

身份验证信息以用户映射的形式向联邦系统注册。

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Ashkan Soltani, an independent privacy and security researcher, said such a move would give attackers "a toehold" in Twitter's internal network, potentially allowing them either to sniff out user information as it traveled across the company's system or break into specific areas, such as the authentication servers that process users' passwords.

NPR: Twitter Says Hackers Compromise 250K Accounts