"Algebraic Informatics" is a collection of selected and peer-reviewed contributions from the 6th International Conference on Algebraic Informatics, which took place in September 2015 in Stuttgart. This series of academic books provides a deep insight into current research topics and developments in the field of algebraic informatics. The 15 revised full texts were selected from 25 submitted papers and cover a wide range of topics, including data models, coding theory, fundamental aspects of cryptography and security, as well as algebraic and stochastic models of computation. The contributions are of interest not only to professionals in computer science but also to students and researchers who wish to engage with the theoretical foundations and practical applications of informatics. The book is written in English and serves as a valuable resource for anyone interested in the latest developments in this dynamic research field.