des 4 security, cryptography

i know about crypto dll used by allapi people and msdn but i don't know how much encryption it supports and whether it supports des 4

Check this link:
http://www.freevbcode.com/ShowCode.Asp?ID=2131

I don't know if it is using DES4 in that example, but at least you'll have a start point.

This may seem a bit off the wall, and would use ssl not des, but would this meet your needs?  

Using the Microsoft.XMLHTTP object you can establish connections to web servers from your vb code.  Setup an SSL encrypted web page on the server that you would be FTPing into (you can password protect it as well if you want) Then use XMLHTTP to open a connection to this secure server and post your file to this page.  This page should receive the file and write it to the file system.

This gives you a couple of things:
1) Ease of encryption/decryption, the ssl handshake etc is all done using existing components and you don't have to write anything.  All of the encryption/decryption is done by the components transparently at the socket/wire level, you send what appears to be plaintext and retrieve what appears to be plaintext.

2) Flexible security, you can get your certificates set to a number of different strengths depending on your needs.

3) Better error handling.  Personally, I've always found FTPs to be a bit of a gamble because things don't always go like they are supposed to, and most ftp modules don't do a good job with error handling.  With this, the receiving site will acknowledge with a 200 status if everything was received ok, and you'll know it worked.

4) Biggest bonus is that if you need to do processing on the remote side, it can be done when the file is recieved.  With FTP you have to write listeners to watch for a file and then take action.


If you're at all interested in a solution like this, let me know and I can give you more details on how this would work.  I'm not going to draft a huge doc, if you're attached to DES, aren't interested in a web service like this, or have already found a solution.  BTW, if you've ever worked with PayPal, this is similar to their IPN solution that they use for payment processing.  So its pretty secure.

-Wes

Thanks for taking interest in this but i want a VB solution and triple des if not des 4 with 128 bit encryption. hence no web scenario here but anyway thanks for providing the info, it could really help me in future.

Regards

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