Question

I want to encrypt a parameter(which consist of sensitive data) while sending to server(WCF Service) using SHA1 algorithm, On server end I’ll decrypt the string and use it.

This way i can ensure any third party won’t read my sensitive data so easily.

How do I encrypt the string in windows phone 7 using SHA1 algorithm and decrypt the same in my WCF service.

Encrypted string may come to server from iPhone, android or WP7; How do I ensure that every client will produce the same result in server.

Update:

Can I use AES algorithm for above requirement?

Answer 1

How do I encrypt the string in windows phone 7 using SHA1 algorithm and decrypt the same

You don’t. SHA-1 is a hashing algorithm. It’s one way – you can’t “decrypt” it. You should choose a symmetric or public/private key algorithm based on your requirements. Read the .NET cryptographic services documentation as a starting point – I’d expect pretty much any of the algorithms supported by .NET to also be supported on other platforms.

Alternatively, just use HTTPS instead of HTTP… that would satisfy your initial highlighted requirement without you having to do much work at all (beyond the server-side deployment of appropriate HTTPS certs).