In the face of large amounts of complicated web information, a professional and individualized web crawling system is required for users to acquire information effectively. In this context, a cloud-based web crawling system is proposed, which can improve the efficiency of application development and reduce its maintenance costs. However, it also poses security risks for application developers. To address the problem of security and privacy protection in a cloud based web crawling system, this paper proposes a framework based on the SSL connection and simHash to ensure the security of storage and transmission. Moreover, a case study demonstrates the effectiveness and efficiency of the security framework.