Uniform Distribution Theory
Journal license

Journal

Uniform Distribution Theory


Volume
& Issue

Volume 14, Issue 2


Published
on

May 17, 2019


Pages

33-42


DOI

Article

On the Maximum Order Complexity of the Thue-Morse and Rudin-Shapiro Sequence

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Authors

Zhimin Sun Affiliation:
Faculty of Mathematics and Statistics Hubei Key Laboratory of Applied Mathematics Hubei University Wuhan, 430062 CHINA
and Arne Winterhof Affiliation:
Johann Radon Institute for Computational and Applied Mathematics Altenberger Straße 69 A-4040 Linz AUSTRIA


Abstract

Expansion complexity and maximum order complexity are both finer measures of pseudorandomness than the linear complexity which is the most prominent quality measure for cryptographic sequences. The expected value of the Nth maximum order complexity is of order of magnitude log N whereas it is easy to find families of sequences with Nth expansion complexity exponential in log N. This might lead to the conjecture that the maximum order complexity is a finer measure than the expansion complexity. However, in this paper we provide two examples, the Thue-Morse sequence and the Rudin-Shapiro sequence with very small expansion complexity but very large maximum order complexity. More precisely, we prove explicit formulas for their Nth maximum order complexity which are both of the largest possible order of magnitude N. We present the result on the Rudin-Shapiro sequence in a more general form as a formula for the maximum order complexity of certain pattern sequences.


Keywords

Thue-Morse sequence, Rudin-Shapiro sequence, automatic sequences, maximum.


Citation

Sun, Z. & Winterhof, A. (2019). On the maximum order complexity of the thue-morse and rudin-shapiro sequence. Uniform Distribution Theory, 14(2), 33–42. https://doi.org/10.2478/udt-2019-0012

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