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Design of SAC/PC(l) of Order k Boolean Functions and Three Other Cryptographic Criteria

Kaoru KurosawaContact Information and Takashi SatohContact Information

(5)  Dept. of Computer Science, Graduate School of Information Science and Engineering, Tokyo Institute of Technology, Tokyo
(6)  Dept. of Physical Electronics, Faculty of Engineering, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro-ku, Tokyo 152, Japan
Abstract
A Boolean function f satisfies PC(l) of order k if f(x) ⊕ f(xα) is balanced for any α such that 1 ≤ W(α) ≤ l even if any k input bits are kept constant, where W(α) denotes the Hamming weight of α. This paper shows the first design method of such functions which provides deg(f) ≥ 3. More than that, we show how to design “balanced” such functions. High nonlinearity and large degree are also obtained. Further, we present balanced SAC(k) functions which achieve the maximum degree. Finally, we extend our technique to vector output Boolean functions.
This author was supported by the Telecommunications Advancement Foundation, Japan.

Contact Information Kaoru Kurosawa
Email: kurosawa@ss.titech.ac.jp

Contact Information Takashi Satoh
Email: tsato@ss.titech.ac.jp
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