Symmetric Cryptography (Dagstuhl Seminar 20041).

This report documents the program and the outcomes of Dagstuhl Seminar 20041 Symmetric Cryptography. The seminar was held on January 19-24, 2020 in Schloss Dagstuhl - Leibniz Center for Informatics. This was the seventh seminar in the series Symmetric Cryptography. Previous editions were held in 2007, 2009, 2012, 2014, 2016, and 2018. Participants of the seminar presented their ongoing work and new results on topics of (quantum) cryptanalysis and provable security of symmetric cryptographic primitives. In this report, a brief summary of the seminar is given followed by the abstracts of given talks.