6AV7872-OBF31-1AC0
軟件攻擊
該技術(shù)通常使用處理器通信接口并利用協(xié)議、加密算法或這些算法中的安全漏洞來進行攻擊。
比如一個典型事例是對早期XXX系列單片機的攻擊。攻擊者利用了該系列單片機擦除操作時序設計上的漏洞,使用自編程序在擦除加密鎖定位后,停止下一步擦除片內(nèi)程序存儲器數(shù)據(jù)的操作,從而使加過密的單片機變成沒加密的單片機,然后利用編程器讀出片內(nèi)程序。
目前在其他加密方法的基礎上,可以研究出一些設備,配合一定的軟件,來做軟件解密。
還有比如利用某些編程器定位插字節(jié),通過一定的方法查找芯片中是否有連續(xù)空位,也就是說查找芯片中連續(xù)的FF FF字節(jié),插入的字節(jié)能夠執(zhí)行把片內(nèi)的程序送到片外的指令,然后用解密的設備進行截獲,這樣芯片內(nèi)部的程序就被解密完成了。
2
電子探測攻擊
該技術(shù)通常以高時間分辨率來監(jiān)控處理器在正常操作時所有電源和接口連接的模擬特性,并通過監(jiān)控它的電磁輻射特性來實施攻擊。
因為單片機是一個活動的電子器件,當它執(zhí)行不同的指令時,對應的電源功率消耗也相應變化。這樣通過使用特殊的電子測量儀器和數(shù)學統(tǒng)計方法分析和檢測這些變化,即可獲取單片機中的特定關(guān)鍵信息。
3
過錯產(chǎn)生技術(shù)
該技術(shù)使用異常工作條件來使處理器出錯,然后提供額外的訪問來進行攻擊。使用最廣泛的過錯產(chǎn)生攻擊手段包括電壓沖擊和時鐘沖擊。
低電壓和高電壓攻擊可用來禁止保護電路工作或強制處理器執(zhí)行錯誤操作。時鐘瞬態(tài)跳變也許會復位保護電路而不會破壞受保護信息。電源和時鐘瞬態(tài)跳變可以在某些處理器中影響單條指令的解碼和執(zhí)行。
(BugPS:該辦法就是使得單片機異常運行從而使得單片機處于非保護狀態(tài))
4
探針技術(shù)
該技術(shù)是直接暴露芯片內(nèi)部連線,然后觀察、操控、干擾單片機以達到攻擊目的。(BugPS:芯片內(nèi)部都完全暴露了,芯片正在瑟瑟發(fā)抖!)
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