| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2018: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2017: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Outline of Final Research Achievements |
In this research project, we proposed new security evaluation methods for lightweight stream ciphers. Specifically, we focused on some structural properties of lightweight stream ciphers, and then developed new attacks exploiting structures of stream ciphers such as impossible collision attacks, cube attacks based on non-blackbox analysis. These enable more accurate security evaluations of known stream ciphers, and finding some insights to design new primitives and components for lightweight stream ciphers. As a result, we succeeded in designing new three lightweight stream ciphers called LILLE, TRIVIUM^2, and Triad. LILLE is based on an Even-Mansour structure, and achieves low area while keeping a strong security property. TRIVIUM^2 is a variant of well-known stream cipher Trivium, and enables low energy implementation but requires more area than LILLE. Triad achieves lightweight implementation, low energy, and high security. These are expected to be used for IoT devices.
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