Information Security and Cryptology: 7th International by Benoît Libert, Moti Yung (auth.), Chuan-Kun Wu, Moti Yung,

By Benoît Libert, Moti Yung (auth.), Chuan-Kun Wu, Moti Yung, Dongdai Lin (eds.)

This publication constitutes the completely refereed post-conference court cases of the seventh foreign convention on info safeguard and Cryptology, Inscrypt 2011, held in Beijing, China, in November/December 2011. The 24 revised complete papers awarded including 2 invited talks have been rigorously reviewed and chosen from eighty submissions. The papers current examine advances within the parts of knowledge defense, cryptology, and their applications.

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Additional info for Information Security and Cryptology: 7th International Conference, Inscrypt 2011, Beijing, China, November 30 – December 3, 2011. Revised Selected Papers

Example text

Then (si (t))∞ t=0 is the sequence of values of the i-th bit. A general NLFSR of order n is characterized by the state transition equations below ⎧ s0 (t) = f0 (s0 (t − 1), s1 (t − 1), · · · , sn−1 (t − 1)), ⎪ ⎪ ⎪ ⎨ s1 (t) = f1 (s0 (t − 1), s1 (t − 1), · · · , sn−1 (t − 1)), (1) .. ⎪ . ⎪ ⎪ ⎩ sn−1 (t) = fn−1 (s0 (t − 1), s1 (t − 1), · · · , sn−1 (t − 1)), where f0 , f1 , · · · , fn−1 are boolean functions of n variables. (1) and its initial state s(0). Definition 1. (1), the nonlinear recurrence of order m describing the sequence of values of the i-th bit is the expression of type 2m −1 m−1 (si (t − m + k))jk aj si (t) = j=0 k=0 , 46 L.

1 Structural Features In previous work [21], we selected a set of 211 structural features of the PE executables from the conclusions obtained in previous research in the area [18– 20]. Some features are extracted directly from the PE file header, while others are calculated values based on heuristics commonly used for detecting packers. Farooq et al. [18] and Perdisci et al. [20] used PE executable structural features, as well as heuristics like entropy analysis or certain section characteristics to determine if an executable is packed or not, as a previous step to a second analysis phase.

Several approaches have been proposed to overcome this evasion technique. We can divide these approaches into static and dynamic approaches. Static approaches gather information about the employed packer without executing the sample, while dynamic unpacking approaches trace the execution of an executable and extract its protected code once unpacked. Normally, the samples are run inside an isolated environment like a virtual machine or an emulator [6]. , where the execution jumps from the unpacking routine to the original code) by using heuristics.

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