The Enigma Cipher Center, Cryptology museum in Poznań, Poland

The Enigma Cipher Center is a museum in Poznań dedicated to the science of encryption and its technical foundations throughout history. The exhibitions use videos, diagrams, and hands-on stations to show how codes work and how they can be broken.

The site first held the Königliche Intendantur des V Armeekorps, built 1843–1847. After World War I the headquarters of the 14th Wielkopolska Infantry Division moved in, and part of the rooms housed the Poznań branch of the Polish General Staff's Cipher Bureau, where Marian Rejewski, Henryk Zygalski and Jerzy Różycki worked. Severely damaged in World War II, it was not rebuilt; a new building for the Polish United Workers' Party authorities rose in 1948 and served until 1990, then housed the Adam Mickiewicz University history department until 2015.

The centre's name comes from the Enigma machine, and its Sub Rosa concert series takes its title from the Latin for 'under the rose', an ancient symbol of secrecy. A herstory project called The Cipher Girls highlights twenty women in mathematics, philosophy, computer science, cryptology and wartime intelligence, with a STEAM workroom and a temporary exhibition.

The museum is located on Święty Marcin street and easy to find with landmarks throughout the area. Plan enough time for your visit since there are many hands-on stations and you can spend time learning how the machines work.

The permanent exhibition holds one original Enigma cipher machine, alongside models of the Polish cryptologists' own devices: Rejewski's cyclometer and bomba and Zygalski's perforated sheets. A temporary show opened in December 2025 by Bérénice Gaça Courtin, granddaughter of Kazimierz Gaca, the youngest member of the Cipher Bureau team.