EAMM0M4F40A7CDKBZD2
EAMM0M4F40A7CDKBZD2
EAMM0M4F40A7CDKBZD2
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所提防護(hù)方案相對典型的縱深防御方案,主要增加了可信防護(hù)模塊(T) 、自治愈模塊( S) 、與 IPS、惡意代碼檢測模塊的接口機(jī)制( I) ,其時間復(fù)雜度分別為f(t(T)) ,f(t(S)) ,f(t(I)) ,f是時間函數(shù),事前監(jiān)控階段主要是可信防護(hù)模塊的持續(xù)監(jiān)控,所提防護(hù)方案( P) 的時間復(fù)雜度為 f(t(P) ) = f(t(T)) = O(n) ,n 為可信模塊部署數(shù)量。事中檢測階段包括可信防護(hù)檢測、數(shù)據(jù)和系統(tǒng)防護(hù)檢測、自治愈恢復(fù)??尚啪W(wǎng)絡(luò)計(jì)算的復(fù)雜度為 O( n12) ,n1為傳輸節(jié)點(diǎn)數(shù),可信數(shù)據(jù)防護(hù)機(jī)制的事件復(fù)雜度為 O( n) + O( 1) ,O( 1) 為偶爾的外部移動設(shè)備訪問監(jiān)控時間,自治愈恢復(fù)為 O(1) ,數(shù)據(jù)和系統(tǒng)防護(hù)的復(fù)雜度為 O( n) ,因此事中檢測階段 f( t( P) ) = f( t( T) ) + f( t( S) ) + f( t( I) ) = O(n12) +2O(n) + 2O(1) 。后審計(jì)取證階段的時間復(fù)雜度為O(1) ??臻g復(fù)雜度主要是增加了可信管理服務(wù)器、自治愈管理服務(wù)器以及相應(yīng)數(shù)據(jù)存儲服務(wù)器,空間復(fù)雜度為 3O( n) 。
3. 3 對比分析
相對于王琦魁等所提出數(shù)控加工網(wǎng)絡(luò)防護(hù)方案( 簡稱王方案) ,本文所提方案增加了可信防護(hù)、自治愈、以及系統(tǒng)協(xié)同防護(hù)模塊。王方案主要采用加工網(wǎng)絡(luò)邊界隔離設(shè)備和終端防護(hù)設(shè)備,配合審計(jì)和防護(hù)協(xié)議保護(hù)數(shù)控系統(tǒng)。在抗攻擊方面,王方案針對外部攻擊具有較好效果,但對惡意內(nèi)部泄露攻擊防護(hù)較弱; 在效率方面,王方案通信內(nèi)容深度檢查、細(xì)粒度訪問控制、主機(jī)入侵防御都需要模式匹配和計(jì)算,時間復(fù)雜度介于 O( n) 和O( n2) 之間,n 為計(jì)算實(shí)體數(shù)量。在防護(hù)效果方面,現(xiàn)場設(shè)備的深度檢查會降低可用性,對完整性破壞的防護(hù)措施沒有提及,對安全攻擊處置較為滯后。
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