Shih-Hsu Chang

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We present an approach to invariant matching. In this approach, an object or a pattern is invariantly represented by an object-centered description called an attributed relational structure (ARS) embedding invariant properties and relations between the primitives of the pattern such as line segments and points. Noise eeect is taken into account such that a(More)
This paper describes the block cipher SEA2. SEA2 is an evolutionary improvement of SEA. Modifications were made to increase the diffusion achieved per round, thus allowing for greater security and fewer rounds. Like SEA, SEA2 makes essential use of key-dependent permutations and substitutions to provide protection against differential cryptnalysis(DC) and(More)
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