expiration date in an application

W

whatazor

Hi all,
is there a particular algorithm for expiration date, that is immune by
the trick of changing system clock (for example in widnows)? Can you
post some links about tecniques? I wish I would use a code based on
date and not on a counter.

thank you in advance,
regards

w
 
V

Victor Bazarov

whatazor said:
is there a particular algorithm for expiration date, that is immune by
the trick of changing system clock (for example in widnows)? Can you
post some links about tecniques? I wish I would use a code based on
date and not on a counter.

With all due respect to your efforts, what does this have to do with C++
language?

V
 
J

James Kanze

Well, he might write it in C++...

Which isn't really relevant.
This is an extremely difficult problem. Most techniques for
this fall into two categories:
(1) There's a method out there on the net to remove this protection
(2) The protection has been used so little that no-one has bothered to
remove it yet.
The few companies that make a business from this will be using
algorithms they have invented themselves, and will not be
published. After all, what would be the use of a protection
scheme that everyone understood?

That people have actually looked at it, and determined that it
will work, rather than your just hoping that no one will figure
out what you're doing. Security through obscurity doesn't work.

If the problem is just to get an accurate time, of course, then
the obvious solution is to use NTP to query a standard time
server.
 
O

osmium

Andy Champ said:
The few companies that make a business from this will be using algorithms
they have invented themselves, and will not be published. After all, what
would be the use of a protection scheme that everyone understood?

RSA is both well understood and effective.
 
T

Thomas J. Gritzan

Andy said:
osmium said:
RSA is both well understood and effective.

RSA is obsolete. If you want encryption use AES. [...]

In what sense is RSA obsolete?
And how can a symmetric block cipher like AES replace an algorithm with
an asymmetric key?
 

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