| Presentation | 2006-09-13 Unconditional Security of Key Establishment System Using a Variable Directional Antenna Kirill MOROZOV, Kazukuni KOBARA, Hideki IMAI, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | This paper evaluates security of the key agreement system for wireless networks proposed recently by Aono et al. This system exploiting the reciprocal property of radio communication channel shows a high potential for providing unconditional security where protection is provided even against an eavesdropper with unlimited computing power. However, a rigorous security analysis was missing there. In this work, we move towards it: we define and compute the information measures characterizing for the legitimate parties and the eavesdropper their uncertainty about the generated key. Furthermore, we show a method for choosing parameters of this system such that the parties succeed in generating a common key while the adversary is ignorant about it with high probability. We also point out that the system needs strengthening using privacy amplification in order to achieve unconditional security under some reasonable (as we shall argue) assumptions: a) that an eavesdropper did not intercept more information on the key candidates than he is expected to; and b) truly random number generation. To illustrate our results, we provide a number of experimental measurements (performed in the typical wireless network environment) which allow us to conclude that using this system one can achieve unconditionally secure key agreement as long as the eavesdropper is not located too close (at the order of tens of centimeters) to the players. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | unconditional security / key establishment / reciprocal principle / multipath / variable directional antenna / privacy amplification |
| Paper # | ISEC2006-87 |
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| Conference Information | |
| Committee | ISEC |
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| Conference Date | 2006/9/6(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
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| Paper Information | |
| Registration To | Information Security (ISEC) |
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| Language | ENG |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Unconditional Security of Key Establishment System Using a Variable Directional Antenna |
| Sub Title (in English) | |
| Keyword(1) | unconditional security |
| Keyword(2) | key establishment |
| Keyword(3) | reciprocal principle |
| Keyword(4) | multipath |
| Keyword(5) | variable directional antenna |
| Keyword(6) | privacy amplification |
| 1st Author's Name | Kirill MOROZOV |
| 1st Author's Affiliation | Research Center for Information Security (RCIS), National Institute of Advanced Industrial Science and Technology (AIST):Department of Electrical, Electronic and Communication Engineering, Chuo University() |
| 2nd Author's Name | Kazukuni KOBARA |
| 2nd Author's Affiliation | Research Center for Information Security (RCIS), National Institute of Advanced Industrial Science and Technology (AIST):Department of Electrical, Electronic and Communication Engineering, Chuo University |
| 3rd Author's Name | Hideki IMAI |
| 3rd Author's Affiliation | Department of Electrical, Electronic and Communication Engineering, Chuo University:Research Center for Information Security (RCIS), National Institute of Advanced Industrial Science and Technology (AIST) |
| Date | 2006-09-13 |
| Paper # | ISEC2006-87 |
| Volume (vol) | vol.106 |
| Number (no) | 235 |
| Page | pp.pp.- |
| #Pages | 8 |
| Date of Issue | |