| 摘要 |
<p>PROBLEM TO BE SOLVED: To maintain a required information route while preventing leakage of information by interrupting a covert channel caused in a network. SOLUTION: Before start of information exchange in a network, combination of access requests is processed (step S100) so as to conduct detection processing of a covert channel (step S102). When a covert channel is in existence (step S104), any access right configuring the covert channel is inhibited (step S106), and when information not relating to the covert channel cannot be transferred by inhibiting the access right (step S108), a new object (step S110) and an access right are produced to rewrite an access matrix (step S112).</p> |
