User's Key Pair

1. Each user will be given two pairs of keys (1 pair of 1024-bit private and public key and 1 pair of 2048-bit private and public key).

2. Public keys will be stored by the system while the private keys will be personally kept by the users.

3. Without the private keys, user can't view eMail's content and send eMail (user can only manage her/his contacts).