关键词: 隐蔽通道 安全系统 机密性 安全保护 信息流安全

Abstract: This paper begins with the introduction of the notion or the definition of covert channel. After explaining the classification of the covert channels, it spent most of its words on the covert channel identification methods currently available in the CCA （

Key words: （;overt channel, Security system, Confidentiality, Security protection, Information flow security