This is a very broad question and the actual approach to be taken will vary 
with the details of what you intend to do (e.g. real-time or not? Files or just 
individual data? For local consumption or for sharing?)

To get started, take a look at the Cryptographic Services Guide: 
https://developer.apple.com/library/mac/documentation/security/Conceptual/cryptoservices/Introduction/Introduction.html

I believe there's also a separate security mailing list. 

One piece of advice: no matter what you are doing, figure out how to use the 
APIs to get it done. *Do not* implement your own crypto scheme because you will 
get it wrong.

(Sent from my iPhone.)

--
Conrad Shultz

On Jun 6, 2012, at 9:51, Charlie Dickman <3tothe...@comcast.net> wrote:

> Can someone direct me to some documentation on how to do data encryption in 
> Cocoa/Objective C/C?
> 
> Charlie Dickman
> 3tothe...@comcast.net
> 
> 
> 
> 
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