內(nèi)容中心網(wǎng)絡(luò)中面向隱私保護(hù)的協(xié)作緩存策略
doi: 10.11999/JEIT140874 cstr: 32379.14.JEIT140874
基金項(xiàng)目:
國(guó)家973計(jì)劃項(xiàng)目(2012CB315901, 2013CB329104)，國(guó)家自然科學(xué)基金 (61372121)和國(guó)家863計(jì)劃項(xiàng)目(2011AA01A103)資助課題
A Collaborative Caching Strategy for Privacy Protection in Content Centric Networking
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摘要: 針對(duì)內(nèi)容中心網(wǎng)絡(luò)節(jié)點(diǎn)普遍緩存帶來(lái)的隱私泄露問(wèn)題，在兼顧內(nèi)容分發(fā)性能的基礎(chǔ)上，該文提出一種面向隱私保護(hù)的協(xié)作緩存策略。該策略從信息熵的角度提出隱私度量指標(biāo)，以增大攻擊者的不確定度為目標(biāo)，首先對(duì)于緩存策略的合理性給予證明；其次，通過(guò)構(gòu)建空間匿名區(qū)域，擴(kuò)大用戶匿名集合，增大緩存內(nèi)容的歸屬不確定性。緩存決策時(shí)，針對(duì)垂直請(qǐng)求路徑和水平匿名區(qū)域，分別提出沿途熱點(diǎn)緩存和局域hash協(xié)同的存儲(chǔ)策略，減小緩存冗余和隱私信息泄露。仿真結(jié)果表明，該策略可減小內(nèi)容請(qǐng)求時(shí)延，提高緩存命中率，在提升內(nèi)容分發(fā)效率的同時(shí)增強(qiáng)了用戶隱私保護(hù)水平。
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關(guān)鍵詞:
- 內(nèi)容中心網(wǎng)絡(luò) /
- 協(xié)作緩存 /
- 隱私保護(hù) /
- 內(nèi)容路由
Abstract: How to mitigate the privacy attacks related to the ubiquitous presence of caching poses challenges to the content delivery in Content Centric Networking. On the basis of trade-off between content distribution performance and users privacy, a collaborative caching strategy for privacy protection is proposed. First, the privacy metrics are designed and the rationality of the proposed strategy is demonstrated by applying the concept of information entropy. And then, the anonymity domain is constructed to increase the uncertainty of which nearby consumer recently requested certain cached content. When making the caching decision, in order to eliminate the cache redundancy and privacy leaks, the hottest on-path caching and the collaborative hash caching are proposed for the vertical requesting path and horizontal anonymity domains, respectively. The simulation results show that the strategy can decrease the request latency, increase the cache hit ratio, and enhance the protection of users privacy while improving the efficiency of content distribution. -
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