發(fā)布時(shí)間：2018-02-09 22:54

  本文關(guān)鍵詞： 嵌入式實(shí)時(shí)系統(tǒng) 加密算法 混合關(guān)鍵 動(dòng)態(tài)規(guī)劃 遺傳算法　出處：《電子科技大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著計(jì)算機(jī)信息網(wǎng)絡(luò)的不斷發(fā)展,基于網(wǎng)絡(luò)的嵌入式實(shí)時(shí)系統(tǒng)也更多的應(yīng)用于人類的生活生產(chǎn)之中。然而,嵌入式實(shí)時(shí)系統(tǒng)的網(wǎng)絡(luò)化在帶來極大便利的同時(shí),隨之而來的便是極大的挑戰(zhàn)。嵌入式實(shí)時(shí)系統(tǒng)與互聯(lián)網(wǎng)緊密相連,必然導(dǎo)致系統(tǒng)遭受來自網(wǎng)絡(luò)的惡意攻擊的可能性變大,尤其是近幾年嵌入式系統(tǒng)與物聯(lián)網(wǎng)的聯(lián)系更加緊密,這意味著系統(tǒng)的失效可能導(dǎo)致嚴(yán)重的人生財(cái)產(chǎn)損失。這就要求系統(tǒng)引入安全保護(hù)服務(wù)以抵御這些安全威脅,然而安全保護(hù)的引入必然導(dǎo)致更多的系統(tǒng)負(fù)載,危及系統(tǒng)的實(shí)時(shí)性,從而加劇系統(tǒng)的失效風(fēng)險(xiǎn)。與此同時(shí),嵌入式系統(tǒng)由于其應(yīng)用環(huán)境的特殊性,其能耗供給往往非常有限,這就要求嵌入式系統(tǒng)在保證安全的同時(shí)嚴(yán)格遵守系統(tǒng)的能量約束。因此如何權(quán)衡系統(tǒng)的安全性,實(shí)時(shí)性及能耗有效性,為系統(tǒng)提供最大限度的安全保護(hù),成為一大挑戰(zhàn)。本文主要針對(duì)分布式的應(yīng)用,從安全,能耗和實(shí)時(shí)三個(gè)方面,在任務(wù)調(diào)度層面對(duì)嵌入式實(shí)時(shí)系統(tǒng)進(jìn)行設(shè)計(jì)優(yōu)化。本文著眼靜態(tài)任務(wù)調(diào)度,在系統(tǒng)設(shè)計(jì)階段通過統(tǒng)籌的考慮系統(tǒng)中所存在的所有任務(wù)及所有可用的資源,探索安全性能加強(qiáng),能量使用有效的嵌入式實(shí)時(shí)任務(wù)的調(diào)度策略。首先,對(duì)常用對(duì)稱加密算法RC5及RC6算法的安全性能進(jìn)行建模,通過分析已發(fā)布的測(cè)試數(shù)據(jù)及對(duì)算法本身的結(jié)構(gòu),對(duì)安全性能及相應(yīng)的時(shí)間能耗開銷進(jìn)行量化。在此基礎(chǔ)上,針對(duì)分布式的數(shù)據(jù)采集的應(yīng)用,分析應(yīng)用可能面臨的安全問題及相應(yīng)的安全需求,面向安全關(guān)鍵的獨(dú)立周期任務(wù),建立安全感知的靜態(tài)任務(wù)調(diào)度模型,以安全性能加強(qiáng)和實(shí)時(shí)性確保為調(diào)度目標(biāo),尋求安全性能最優(yōu)的任務(wù)調(diào)度算法,并就其有效性和局限性進(jìn)行探討。另外,針對(duì)分布式的安全及能耗關(guān)鍵嵌入式實(shí)時(shí)系統(tǒng)及分布式并行任務(wù),分析其安全能耗需求,提出了安全加強(qiáng),能量有效及實(shí)時(shí)性保證的靜態(tài)調(diào)度模型。我們主要通過總線數(shù)據(jù)加密和總線通信量減少兩種途徑來提升系統(tǒng)安全性能,在此基礎(chǔ)上尋求安全及能耗感知的靜態(tài)任務(wù)調(diào)度方法。對(duì)安全敏感的混合關(guān)鍵實(shí)時(shí)系統(tǒng)進(jìn)行分析和研究,抽象出基于系統(tǒng)行為的混合安全關(guān)鍵的系統(tǒng)模型,提出安全敏感的混合關(guān)鍵實(shí)時(shí)系統(tǒng)能量?jī)?yōu)化的問題,并在此基礎(chǔ)上給出相應(yīng)的調(diào)度方法。
[Abstract]:With the continuous development of computer information network, embedded real-time system based on network is more and more applied in the production of human life. However, the network of embedded real-time system brings great convenience at the same time. The following is a great challenge. Embedded real-time systems are closely connected to the Internet, which will inevitably lead to a greater possibility of malicious attacks from the network, especially in recent years, when embedded systems are more closely linked to the Internet of things. This means that the failure of the system may lead to serious loss of life and property. This requires the system to introduce security protection services to resist these security threats. However, the introduction of security protection will inevitably lead to more system loads and endanger the real-time performance of the system. At the same time, because of the particularity of its application environment, the energy supply of embedded system is often very limited. Therefore, how to balance the security, real-time and energy efficiency of the system to provide maximum security protection for the system. This paper aims at distributed application, designs and optimizes embedded real-time system from three aspects of security, energy consumption and real-time. This paper focuses on static task scheduling. In the system design phase, by considering all the tasks and all available resources in the system as a whole, we explore the security performance enhancement, energy use effective embedded real-time task scheduling strategy. The security performance of RC5 and RC6 algorithms is modeled. By analyzing the published test data and the structure of the algorithm itself, the security performance and the corresponding time consumption cost are quantified. Aiming at the application of distributed data acquisition, this paper analyzes the security problems that the application may face and the corresponding security requirements, and sets up a security aware static task scheduling model for the security critical independent periodic task. The task scheduling algorithm, which aims at enhancing the security performance and ensuring the real-time performance, seeks for the optimal security performance of the task scheduling algorithm, and discusses its effectiveness and limitation. Aiming at distributed security and energy consumption key embedded real-time systems and distributed parallel tasks, the requirements of security energy consumption are analyzed, and security enhancement is proposed. Energy efficient and real-time guaranteed static scheduling model. We mainly use bus data encryption and bus traffic reduction to improve the security performance of the system. On the basis of this, the static task scheduling method of safety and energy consumption awareness is sought. The security sensitive hybrid critical real-time system is analyzed and studied, and the system model of hybrid security critical system based on system behavior is abstracted. The problem of energy optimization for security sensitive hybrid critical real time systems is presented, and the corresponding scheduling method is given.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TP393.08

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本文編號(hào)：1499050