CSS uses an encryption algorithm to encrypt content on the DVD disc. That is, decrypt with formula 13, "encrypt" with formula 12, then decrypt with formula 11. It is necessary only to encrypt and authenticate the existing data stream. A key must be selected before using a cipher to encrypt a message. AnyDesk uses TLS/AES to encrypt connections. The user's password was used as a key to encrypt a fixed value. Some deliberately obfuscate or even encrypt the serialized data. Some Telegram clients allow users to encrypt the local message database by setting a passphrase. The 7z format provides the option to encrypt the filenames of a 7z archive. Some enterprise tape drives can quickly encrypt data. Using the keys, the users can encrypt their messages and send them secretly. This did not encrypt the user's contact database or message timestamps. Tony guides Kim through evading the guards and how to encrypt the files. Before 2013, Google did not encrypt data stored on its servers. By making this information public, anyone can encrypt messages to Bob.