I have an azure cloud service (WebRole) and I want to purchase an SSL certificate.
What is the technical requirements to purchase this certificate? An SSL provider like godaddy offers 256-bit encryption certificate but Azure documentation said that The certificate must use a minimum of 2048-bit encryption, I no one provide such length.
GoDaddy provides certificates that work with Azure just fine. We use them quiet well (just installed a new one yesterday)
Here's a helpful blog that seems to address the "how-to" http://blog.amusedia.com/2011/10/setting-up-secure-windows-azure-web.html
All major domain hosting companies support 2048 bit root certificates as shown in this comparison table:
http://www.networksolutions.com/SSL-certificates/compare.jsp
Whoever is hosting your domain/DNS should be able to generate this certificate for you. I would suggest sending them this link if you aren't sure that they can do it.
http://www.windowsazure.com/en-us/develop/net/common-tasks/enable-ssl/
If the company hosting your domain can NOT issue a SSL/TLS certificate that meets those requirements then you should probably move your domain to someone who can. I want all of my domain and SSL hosting with only one company for my convenience.
Back in 2013, GoDaddy was an option, but these days Let's Encrypt are offering free SSL certificates, and there's an Azure Extension that ties in, to auto-renew them, too.
The SSL Certificates from Let's Encrypt are genuine, real and as secure as any other.
Here's a few links to get anyone new to this on their way:
Securing an Azure App Service Website under SSL in minutes with Let's Encrypt