In an amicus brief filed this week by the national ACLU, ACLU of Massachusetts, EFF, and the Cyberlaw clinic at the Berkman Center for Internet and Society at Harvard Law School, our attorneys argue that decrypting files is not like unlocking a door or even providing a combination to a safe. Encrypted files are scrambled messages. When we decrypt them, we aren’t unlocking them — we are creating new records. Moreover, forced decryption reveals information about our possession of, access to, and control over the files.

via Massachusetts High Court Set to Rule on Whether State Can Force You to Decrypt Your Drive | American Civil Liberties Union.