To provide a secure, effective but simple message handling, a method is
provided for transmitting an electrical message, from a first user having
a first terminal to a second user having a second terminal. The method
comprises the steps of: transmitting said email in an encrypted form by
said first terminal, said encrypted e-mail being encrypted by means of a
key generated by a first key generator using a seed, providing once said
second user with said seed for generating a key with a second key
generator provided in said second terminal, providing to and storing said
seed in said second terminal, using said seed by said second terminal for
generating a key each time an encrypted email from said first user to
said second user is received, synchronising a counting value in each
terminal; and generating said key on the basis of said seed and a
counting value in each terminal, independently of other terminal.
