Sometimes it is really necessary to protect your
application against start-up by third person. Just
imagine: you work on your computer at home, but the
computer is also used by other family members.
Situation, that your child turns on computer, starts
up your application, and destroys all your work, can
happen really easily. The same can possibly happen in
your office when one of your colleagues uses your
computer.

SEPP is suitable for standard users who need to
protect some applications against unauthorized start-
ups. But it can be also used by professionals for
sending sensitive applications via e-mail (e.g.
software developers can protect their beta versions)
or system administrators can protect some applications
against their start up by standard users. It will be
very helpful for I-net cafe providers in case they
want to restrict starting up some applications by
their customers.

For the protection there is used really strong
encryption algorithm AES (known as Rijndael) in SEPP.
SEPP uses cryptography of 256-bites length which is
currently unbreakable. If there had been used more
than 1 million computers for breaking one key, it
would have taken longer than lifetime of anybody on
earth to brake it. Although there is used such a
strong encryption, the time for start up of protected
application is just slightly extended, since SEPP has
been programmed in Assembler and AES algorithm is very
fast. Of course, all depends also on speed of the
processor where the protected application is run.

The protected application is encrypted with
symmetrical encryption algorithm AES (Rijndael) and
wrapped by "envelope". After start up of protected
application, this "envelope" runs the window for
entering the correct password. If the wrong key is
entered, application will not be correctly decrypted
and will not start-up. Application will start up
successfully only when the correct password is entered.

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