Download Cloud Computing and Security: Second International by Xingming Sun, Alex Liu, Han-Chieh Chao, Elisa Bertino PDF

By Xingming Sun, Alex Liu, Han-Chieh Chao, Elisa Bertino

This quantity set LNCS 10039 and LNCS 10040 constitutes the completely refereed post-conference lawsuits of the second one foreign convention on Cloud Computing and safety, ICCCS 2016, held in Nanjing, China, in the course of July 29-31, 2016.

The ninety seven papers of those volumes have been rigorously reviewed and chosen from 272 submissions. The papers are equipped in topical sections equivalent to: info Hiding, Cloud Computing, Cloud defense, IOT functions, Multimedia purposes, Multimedia defense and Forensics.

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Read or Download Cloud Computing and Security: Second International Conference, ICCCS 2016, Nanjing, China, July 29-31, 2016, Revised Selected Papers, Part I PDF

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Extra info for Cloud Computing and Security: Second International Conference, ICCCS 2016, Nanjing, China, July 29-31, 2016, Revised Selected Papers, Part I

Example text

9800 Table 6. 7511 embedded watermark will be affected by rotation operation. Table 6 gives the experimental result of the extracted watermarks from the watermarked images attacked by different rotations, and illustrates the robustness of the proposed algorithm is better to other algorithms [10, 15]. However, three methods have lower robustness when increasing the rotation angle, which will be further researched in future. Obviously, the cropping attack can cut part of image pixel, which directly decides the quality of the extracted watermark.

The construction of the three integers is formulated by the following three steps. First, xi is obtained by xi = 2 pi /2 . Second, an integer ri is randomly selected from {0, 1, 2, · · · , xi }. Finally, a0i and a1i are set to be ri , and ti is set to be pi − 2ri . For the next step, the image I is encrypted unit by unit according to the Paillier algorithm. That is, E(pi ) = E(ti + a0i + a1i ) = E(ti )E(a0i )E(a1i ). (1) When all the units are encrypted, the encrypted units comprise the encrypted image EI.

The receiver R decrypts E(m) by the private key, and gets the original message m. An example of the proposed method is given below. Example 1. Let the original pixel be pi = 134 and let the to-be-embedded bit be b = 0. In image encryption phase, xi = 2 pi /2 = 2 134/2 = 67 is computed. Suppose that ri = 5 is randomly selected from {0, 1, · · · , 67}. Then, a0i = ri = 5, a1i = ri = 5 and ti = pi − a0i − a1i = 124. And pi is represented by pi = ti = ti − a0i − a1i = 124 + 5 + 5. When pi is encrypted, we obtain E(124)E(5)E(5).

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