What kinds of cryptographic algorithm i can use to sends/receives data to/from webserver?

What kinds of cryptog开发者_运维百科raphic algorithm i can use to sends/receives data to/from webserver in iOS?(My webserver don't use https)

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NSURLConnection natively supports https.

Edit:

If you are looking to encrypt HTTP content across a normal HTTP connection, you can use Apple's crypto services. It looks like your options are limited on iOS. You might need to use libcrypto directly.