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: [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\KeyExchangeAlgorithms\Diffie-Hellman] "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: [login to view URL] = Function() True [login to view URL] = False 'was false MK Fix 1July2017 [login to view URL] = [login to view URL] Or [login to view URL] Dim req As HttpWebRequest = DirectCast([login to view URL](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 vb.net.