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1C31234G01
發(fā)布者:gw0002  發(fā)布時(shí)間:2018-08-21 15:49:01

1C31234G01

1C31234G01

1C31234G01

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 相對(duì)于 Fadul 提出智能電網(wǎng)可信防護(hù)方案,本文所提方案更為全面。Fadul 方案利用基于信譽(yù)的信任管理系統(tǒng)來緩和針對(duì)未來智能電網(wǎng)設(shè)施脆弱性的攻擊,可信系統(tǒng)部署在智能電網(wǎng)通信支持防護(hù)系統(tǒng)中。在抗攻擊方面,F(xiàn)adul 方案由于信譽(yù)的反饋延時(shí),抗突發(fā)攻擊能力較弱。在效率方面,信譽(yù)計(jì)算和信任管理需要多域的網(wǎng)絡(luò)社區(qū)參與迭代計(jì)算,時(shí)間復(fù)雜度接近O( n2) ,空間復(fù)雜度為 mn,m 為實(shí)體歷史向量長(zhǎng)度,n為實(shí)體數(shù)量。在防護(hù)效果方面,基于信譽(yù)的惡意攻擊免疫機(jī)制和通信帶寬合理分配機(jī)制,使得具有較好的安全性,適宜的可用性,但完整性防護(hù)欠缺。

  以上分析結(jié)果列于表 1 中,防護(hù)效果用三個(gè)級(jí)別的屬性值表示: “優(yōu)”、“中”、“差”,“差”表示相應(yīng)的屬性未提及或效果較差。有一定效果,略顯不足為“中”。抗攻擊效果分為 2 個(gè)狀態(tài): 可信和不可信。效率用時(shí)間復(fù)雜度表示。表 1 所示結(jié)果為以本文方法作為當(dāng)前標(biāo)準(zhǔn)的相對(duì)性能,可以推測(cè)出本文所提方案的優(yōu)越性。

表 1 防護(hù)方案對(duì)比

3.4 實(shí)例分析

  以高級(jí)持續(xù)性威脅 ( Advanced Persistent Threat,APT) 攻擊為例,分析所提綜合防護(hù)方案的有效性。

  APT 攻擊靈活組合多種新型攻擊方法,對(duì)目標(biāo)長(zhǎng)時(shí)間滲透,在特定時(shí)刻實(shí)施攻擊。典型的針對(duì)數(shù)控系統(tǒng)的 APT 攻擊過程分為 5 個(gè)階段。①收集情報(bào)。利用社會(huì)工程,搜集并鎖定特定的數(shù)控機(jī)床。②突破防線。利用服務(wù)器漏洞、網(wǎng)站掛馬、釣魚軟件、移動(dòng)客戶端漏洞,攻入辦公網(wǎng)主機(jī),獲取受害主機(jī)的權(quán)限。③建立據(jù)點(diǎn),橫向滲透。建立控制服務(wù)器到受害主機(jī)的信道并獲取系統(tǒng)權(quán)限,橫向探測(cè)辦公網(wǎng)系統(tǒng)和 DNC 網(wǎng)絡(luò)的結(jié)構(gòu)和數(shù)據(jù)訪問規(guī)則,入侵更多主機(jī),并規(guī)避被發(fā)現(xiàn)。④攻擊 DNC 系統(tǒng)服務(wù)器。模擬正常節(jié)點(diǎn),連接DNC 系統(tǒng)服務(wù)器和 DNC 傳輸服務(wù)器,利用服務(wù)器漏洞,獲取系統(tǒng)代碼執(zhí)行權(quán)限。⑤完成攻擊。修改或破化控制數(shù)據(jù),造成數(shù)控機(jī)床設(shè)備損壞或停機(jī),并伴隨蹤跡銷毀等撤退策略。




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