【单选题】【消耗次数：1】
SSL协议提供的服务不包括（）。
①
认证用户和服务器，确保数据发送到正确的客户机和服务器。
②
加密数据以防止数据中途被窃取。
③
维护数据的完整性，确保数据在传输过程中不被改变。
④
防止数据被非法用户窃取，保证信息在互联网上安全传输。
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