Download web pages via HTTPS - weak DH 768bit on Windows C#

We need code in VB.NET 4.5.2 to download web pages via HTTPS from web servers which have weak and strong ciphers/Diffie-Hellman key exchanges.

Sounds super easy but difficulty is that Microsoft has rolled out recenlty updates which now block weak (512/768) Diffie Hellman Key Exchanges. We download pages via HTTPs from multiple servers which we have no access and which have WEAK (DH 768 bit) and strong ciphers. Microsoft now blocks weak ciphers by default and the following registry key enables HTTPS on weak DH 768 bit:


"ClientMinKeyBitLength"=dword:00000200 (512bit)

We need a code solution which works for all ciphers with the latest Microsoft updates. The registry can NOT be changed so above key can registry NOT be set (although this would make it work).

Roughly the code looks as follows (to illustrate the requirements).

1.) Allow weak DH (768bit) via Microsoft CSP provider (this is the MAGIC required here)

2.) Download page via HTTTPs (Trivial), as follows:

[url removed, login to view] = Function() True

[url removed, login to view] = False 'was false MK Fix 1July2017

[url removed, login to view] = [url removed, login to view] Or [url removed, login to view]

Dim req As HttpWebRequest = DirectCast([url removed, login to view](url), HttpWebRequest)

3.) Undo any permanent changes done in 1.)

The solution should not require admin privileges, THe registry can NOT be changed.

Do not attempt this solution if you are not an expert in SSH, diffie Hellman, encryption or Microsoft CSP. You will also likely need Pinvoke to use C++ style calls to crypto libs on WIndows.

Acceptance criteria: Fully working code which works to download the web page via any HTTPS and cipher combination. We will test but not fix your code. Escrow will be only released in full when the code fully works. No partial $ will be paid for hours spend with partial results.

When submitting the solution, you must include how you have tested your code towards public testing servers with HTTPS and weak 512/768 Diffie Hellman and also strong ciphers.

Deliverables: Windows FOrm Application which has a text box to enter URL to download page. Button to download which then Msgbox(pagecontent). Visual Studio 2015 code in .NET 4.5.2 in Visual Basic. YOu can of course start in C# and then convert to

This requires an EXPERT IN CIPHERS, SSL and ENCRYPTION. Most submissions so far are from general coders, web designers etc. Again looking for an EXPERT IN CIPHERS, SSL and ENCRYPTION.

Ev'body else should stick to what they know best.

Competenze: Programmazione C#, Sicurezza Web, Windows Desktop

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Sul datore di lavoro:
( 7 valutazioni ) Hornsby Heights, Australia

ID Progetto: #10954473

12 freelance hanno fatto un'offerta media di $1316 per questo lavoro


*** Expertise in C#,WINDOW APPLICATION,VB.NET*** Greetings! Stand out with great design! and great development! With over 12 years of producing corporate marketing projects for some of the most innovative comp Più

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