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    # 多媒體安全 [TOC] ## Info - wjl@cmlab.csie.ntu.edu.tw - 21 - [整理](https://app.diagrams.net/#G1JAfJzncB9Kz5XMo1Dr20lMsbA3dGtrDa) - ![](https://i.imgur.com/oL70z2J.png) - 期中 - 甚麼問題、為甚麼有興趣 - 可以看1.2 - ## 2/14 - 多媒體影像 壓縮過 - 要先知道做的研究是屬於哪一塊 - 藏圖 - watermark: capcity, Fidelity, Robustness - broadcast encryption -> Netflix dynamic change with time - 作業可以做homomorphic encryption - eoting ssystem- timelock confidential computing - confidential ML - https://medium.com/sherry-ai/%E8%81%AF%E7%9B%9F%E5%BC%8F%E5%AD%B8%E7%BF%92-federated-learning-b4cc5af7a9c0 - https://en.wikipedia.org/wiki/General_Data_Protection_Regulation - watermark dnn - capcity - fidelity - robustness ## 2/21 - security awareness program > 薪水高 - Adversarial machine learning - Security as a service - privacy preserving ## 3/7 - 期末可以做 metaveerse 有哪些security issue、目前的state of art - homomorphic encryption (同態加密) - key exchange - asymmetric - RSA - DiffieHellman key exchange - ECDSA - ElGamal encryption - sysmmetric - standard: DES, AES - example - 安全組織: NIST - 會有漏洞: - 不要只看NIST報告前十頁 - 數論 - extension field - $\frac{R}{(x^2+1)}$ -> R>C - 安全(量子電腦出來前) - 離散對數問題 - 兩個指數相乘 ![](https://i.imgur.com/Mukd40o.jpg) ![](https://i.imgur.com/ZygRtMo.jpg) ![](https://i.imgur.com/6HRbmGU.jpg) ![](https://i.imgur.com/s1fcbd4.jpg) - 應用 - 遠距醫療 - [GDPR](https://gdpr-info.eu/) - secretary for metaverse -> 可以做final - issues - solutions - state of art - Cloud Commputing service provider - container - Confidential ML - 比大小 - 百萬富翁問題 (smart contract) - 參考下圖來分析 ![](https://i.imgur.com/dhpLyMi.jpg) - garble circuit - ## 3/14 ![](https://i.imgur.com/NjYjw9j.png) ![](https://i.imgur.com/DyLU7R9.png) ![](https://i.imgur.com/j80MkYm.png) ## 3/28 - digital twins - 目前技術困難 - 1-多 的互動 - 遊戲vsmetaaverse - 遊戲要透過本人購買 - metaverse可以直接透過虛擬分身購買 - social media最適合e.g. Facebook->Meta - 雖然目前技術有困難 - 創業 - 科技 - text-based > internet - virtua; > 3D graphic - Multiplayer (MMOG) > internet usage at -scale - immersive virtual envornments on mobiles and weables> blockchain - blockchain, CV, distributed network, pervasive computing, scene understanding, ubiquitous interfaces - ecosystem-wise - user, marketing - must-have(精細), nice have(較粗糙) - ![](https://i.imgur.com/FUkZJYd.jpg) ![](https://i.imgur.com/0LiPPsT.jpg) - IPR - career plan - 寫程式到50歲? - 技術人才可以把技術做得很好,再賣給別人 - Avatar的精細度>facebook會有興趣 - 期末可以找 - IEEE symposium on security and privacy > 不多 但很難 - Information Forensics and Security - ACM communicatiosns https://github.com/baozjian/Top-Blockchain-paper -https://ieeexplore.ieee.org/document/6547120 - An Ideal-Security Protocol for Order-Preserving Encoding (Encryption) - Zerocoin: Anonymous Distributed E-Cash from Bitcoin - PP in Key-Exchange over Internet>很難 4.1 P24 從最基本的homomorphic encryption出發解決現在metaverse的問題 - https://ieeexplore.ieee.org/document/5484841 - https://ieeexplore.ieee.org/abstract/document/9336711 - 如何傳機密資料但看起來不要完全是雜訊 6.1 p17 - avatar怎麼避免跟蹤 - challenge - 怎麼知道avatar不正常(比如霸凌問題) - ## 有名的人 - andrew yao ## 期中 同學們好, 以下有幾點是最近MMsec需要跟各位公告的事項,還請各位同學留意 ---------------- 1. 期中報告deadline和繳交方式已經公佈,請各位同學至NTU COOL->作業區查看 原則上第一份報告(佔總成績15%)deadline為4/4 23:59,第二份報告(佔總成績25%)deadline為4/25 23:59 報告需要呈現的內容都已在學期初上課時提及,若有不清楚的同學可以看課程內容中的0214上課錄影 請各位同學在期限內繳交,檔案格式為pdf file,內容至少4頁。 ---------------- 2. 現在開始每週NTU COOL上都會包含 1. Lecture pdf file 2. course recording 3. 課堂上沒有放到的額外補充mp4 file ---------------- 3. 最近有更換錄影的器材和影片輸出方式, 如果有任何有關課堂錄影的建議(ex 雜音太多,看不清楚等...),歡迎寄信通知 ---------------- 以上是近期MMsec幾個比較重要的事項,如果有任何關於課程的問題都歡迎在COOL上寄信 或者寄信至ipr@cmlab.csie.ntu.edu.tw,謝謝! Best, 助教 鄒汶橙 ## 4/11 - untrust server (Google 為了加速運算,他會copy一份) - the prism project 稜鏡計劃 - searchable encryption - https://www.sciencedirect.com/science/article/pii/S0167739X18314134?casa_token=UmmV24iMhV0AAAAA:gb48zVpGsu2xCbEGyqHx1R4ueh-UvfUXY67wR1DZJ51D8gbEqIWZ6lFUarFkR4KdsZTiWljMkQ8 2019 226 cite - PSSBP: A Privacy-preserving Scope-query Searchable Encryption Scheme Based on Blockchain for Parking Lots Sharing in Vehicular Networks - IEEE Conference on Embedded and Ubiquitous Computing, EUC - secure buyer-seller protocol > 可被用在watermark ## 4/18 - 證明安全性 - ![](https://i.imgur.com/qS4P7wa.png) - 引用很多 大部分是對岸 - location-based:要算KNN,算距離某點最近的幾個商家etc... - 密碼學可能會有執行上複雜度太高的問題,可透過資訊的平行演算法、線性代數的技巧下降複雜度 - homomorphic - pilier/NTRU - ![](https://i.imgur.com/MnPjoXt.png) - 2-D KNN - pilier只能做加法 ## 4/25 - security audit(安全審計) - 有潛力的 business - CIA - ![](https://i.imgur.com/gqyLysP.png) ![](https://i.imgur.com/s2hZ7UN.png) https://fhe.org/ ## 5/9 - ![](https://i.imgur.com/W4uSHQ7.png) - ![](https://i.imgur.com/nVJ4qfC.png) - ![](https://i.imgur.com/9K3vkD0.png) - ![](https://i.imgur.com/xoa2vqf.png) - linear correlation - ![](https://i.imgur.com/neNjoFp.png) - ![](https://i.imgur.com/335WqxF.png) - ![](https://i.imgur.com/sO2M4l8.png) - ![](https://i.imgur.com/aDzsuAs.png) - ![](https://i.imgur.com/AVGUch9.png) ## 5/16 - watermark - 知道誰備份 - 知道有沒有被用過>dvd燒錄>unbinding problem - claim不合法的copy是由seller製作 - 顧客把signature送給buyer,buyer把signature加入watermark並放入商品 > buyer沒有辦法仿造簽名 >沒有解決 是誰把原始東西做出來 - 加入第三方>證明清白 - alice:seller, Bob:buyer - 沒有針對metaverse的互信機制 - 每一步在做甚麼 為甚麼要這樣做 利害得失 - 解決unbinding problem - onetime key pair - buyer 把pk寄給C,C給buyer認證 - ![](https://i.imgur.com/ZnYeZHG.png) ![](https://i.imgur.com/0IQ6aFh.png) - e commerce - ![](https://i.imgur.com/yEK4QZo.png) ![](https://i.imgur.com/zsBQFkW.png) ![](https://i.imgur.com/6oDCD8u.png) ![](https://i.imgur.com/M96ZGLG.png) ![](https://i.imgur.com/6Ujysg1.png) ![](https://i.imgur.com/ndsbteb.png) ![](https://i.imgur.com/nKAvVW4.png) ![](https://i.imgur.com/dfmWwjs.png) ![](https://i.imgur.com/hCHHL8y.png) ![](https://i.imgur.com/ItxCMFL.png) --- ![](https://i.imgur.com/GIAmft4.png) ![](https://i.imgur.com/7IZG0Ow.png) ![](https://i.imgur.com/Gbt74v2.png) ![](https://i.imgur.com/GucUFXA.png) ![](https://i.imgur.com/HCmermj.png) ![](https://i.imgur.com/Uwyefvz.png) ![](https://i.imgur.com/ItWbs42.png) ![](https://i.imgur.com/bSxIqrz.png) ![](https://i.imgur.com/DjDk3Xt.png) ![](https://i.imgur.com/6eu5z45.png) ![](https://i.imgur.com/ln58Tyy.png) ![](https://i.imgur.com/SZB2DMh.png) ![](https://i.imgur.com/wirO3sR.png) ![](https://i.imgur.com/8KzvUtR.png) ![](https://i.imgur.com/1MDogzI.png) ![](https://i.imgur.com/OClnVls.png) ![](https://i.imgur.com/BnbEHsM.png) ![](https://i.imgur.com/tkvblVT.png) ![](https://i.imgur.com/Oku2RnP.png) ![](https://i.imgur.com/c45OcOY.png) ![](https://i.imgur.com/KVWBi4m.png) ![](https://i.imgur.com/LzSnkoT.png) ![](https://i.imgur.com/d97jcHD.png) - metaverse 沒有做一個好的watermarking scene - 兩個虛擬人物如何取得互信,buyer-seller protocol是個很好的範例 - 應用: 公平交易平台 ![](https://i.imgur.com/Jed2Op7.png) ![](https://i.imgur.com/gRUKgJO.png) ![](https://i.imgur.com/Fq9hKsd.png) ![](https://i.imgur.com/Byd9cs6.png) ![](https://i.imgur.com/9E94JJI.png) ![](https://i.imgur.com/ZbHPCp3.png) ![](https://i.imgur.com/14PWxGB.png) ![](https://i.imgur.com/VjfYXiy.png) ![](https://i.imgur.com/BUlpd2i.png) ![](https://i.imgur.com/Gm24CsD.png) ![](https://i.imgur.com/edjjV9U.png) ![](https://i.imgur.com/0WmxZch.png) ![](https://i.imgur.com/EYUywUt.png) ![](https://i.imgur.com/WwLU0O6.png) ![](https://i.imgur.com/e7XtKK1.png) ![](https://i.imgur.com/H6UsSXD.png) ![](https://i.imgur.com/jjwNyaf.png) ![](https://i.imgur.com/dRu1lUj.png) ![](https://i.imgur.com/sOtYjPQ.png) ![](https://i.imgur.com/5k1ixfN.png) ![](https://i.imgur.com/AwSx2sM.png) ![](https://i.imgur.com/PjBUk7a.png) 實務面不太合理>使用者跟驗證單位去做驗證 刑事法律 要證明自己清白、對方證明 民事只需要對方證明 ![](https://i.imgur.com/ci7CU9n.png) ![](https://i.imgur.com/nL9aVaG.png) ![](https://i.imgur.com/K4DIywI.png) ![](https://i.imgur.com/rsMux6n.png) ![](https://i.imgur.com/FBXnEx8.png) ![](https://i.imgur.com/kIh12Xt.png) ![](https://i.imgur.com/jr2akay.png) ![](https://i.imgur.com/XsnAVpt.png) ![](https://i.imgur.com/kf3zYTM.png) ![](https://i.imgur.com/tkGnBtj.png) ![](https://i.imgur.com/sHvgX5K.png) ![](https://i.imgur.com/hmze2jB.png) ![](https://i.imgur.com/eZxMOpY.png) ![](https://i.imgur.com/L0fUH6n.png) ![](https://i.imgur.com/ZHPGDoO.png) ![](https://i.imgur.com/eXNfkKP.png) ![](https://i.imgur.com/Og4n80q.png) - 怎麼把time放進watermark很重要 ![](https://i.imgur.com/9n4kLRH.png) ![](https://i.imgur.com/mpQjMQi.png) ![](https://i.imgur.com/p8Lh5Bv.png) ![](https://i.imgur.com/ZG6L0Tq.png) ![](https://i.imgur.com/QolGrDW.png) ![](https://i.imgur.com/aVwLW3j.png) ![](https://i.imgur.com/5lo33zY.png) ![](https://i.imgur.com/4zIxxij.png) ![](https://i.imgur.com/t3IQTj1.png) ![](https://i.imgur.com/FrHkqRq.png) ![](https://i.imgur.com/aw5KZeh.png) ![](https://i.imgur.com/saINylp.png) ![](https://i.imgur.com/c0BISYy.png) ![](https://i.imgur.com/tSqa3UW.png) ![](https://i.imgur.com/XPLip3e.png) ###### tags: `筆記`

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