We introduce a simple and powerful visual interaction technique for managing strong passwords. Passwords have been used for authentication for decades, but appropriate handling of passwords is difficult because people can easily forget passwords and they can be easily attacked. Better authentication methods have been investigated, and various visual interaction methods have been proposed, including the DAS (draw-a-secret) method. Using DAS, users can log into a service just by drawing a secret pattern on the screen, but remembering complex secret patterns is as difficult as remembering passwords. We developed EpisoDAS, with which users can generate strong passwords based on their secret episodic memories with a simple DAS interface. A user can draw a secret pattern and generate a password, based on their secret episodic memories that they cannot easily forget.