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Living in a rapidly changing world, where new threads emerge very often, security is at the epicenter of the international dialogue. Security is a broad term covering many activities like forecasting, prevention, building new communication and detection methodologies and many others, therefore many branches of science including mathematics has a lot to contribute to this issue. In this text we wish to highlight the role of approximation theory for fast pattern recognition. In particular, we build a new fingerprint function on the set of all words of length N written in an alphabet. Since a hash function is a way for fast text processing, we approximate our fingerprint function by an appropriate hash function in order to reduce its computational complexity.
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