cryptography

[desham]

Hi ,

 I want to get back the original signal using cryptography, Can any one explain me about this and what blocks are needed for that.

Where can i found about cryptography. I need few examples of cryptograhy algorithms

[josborne]

I don't think it is feasible to unencrypt your signal unless you know the algorithm and key that was used.  That is the whole point of encryption. 

Here's a good example of the Blowfish algorithm, though:  http://zone.ni.com/devzone/cda/epd/p/id/3473

[F._Schubert]

Just take a look at wikipedia, e.g. here is the Blowfish.

A LabVIEW code can be downloaded as stated above.

For the implementation of other algorithms, check one of the many Open Source tools for cryptography (gnupgp, truecrypt). I guess that some of these tools take reusable libraries for this, so you could call them from LV as dll's.

Felix

[smercurio_fc]

Previously asked as "inverse of hash function".