Passwords for the RFB protocol (VNC) are used to DES-encrypt a challenge token sent by the server. However, each byte in the key is reversed before it is used

Passwords for the RFB protocol (VNC) are used to DES-encrypt a challenge token sent by the server. However, each byte in the key is reversed before it is used for encryption. Of course, this happens only once per connection so there's generally not much of a need for it to be particularly fast.