RDP communications are encrypted using 128-bit RC4 encryption. With encryption, the email is encrypted with AES under a user-supplied password. Now, the default is to use software encryption for newly encrypted drives. Passwords can be encrypted by hand on paper and remember the encryption method and key. Passwords stored in plain text are not encrypted. Until 2008, all CACs were encrypted using 1,024-bit encryption. LastPass is a freemium password manager that stores encrypted passwords online. A PDF file may be encrypted for security, or digitally signed for authentication. In transport mode, only the payload of the IP packet is usually encrypted or authenticated. In tunnel mode, the entire IP packet is encrypted and authenticated. Synchronization data will be encrypted by default. However, notes stored on Evernote servers are not encrypted. Voice data is encrypted with AES. To maintain secrecy, radio operators encrypted their messages using polyalphabetic ciphers. Even encrypted data may be cracked.