56 bit encryption in iPhone app to avoid export limitations by BIS

I need a push in the right direction - preferably with code samples/links - for how to encrypt an NSString using DES encryption algorithm. Knowing that it is not that secure, but a possible candidate for avoiding to file a CCATS. Could commoncrypt be the solution?开发者_运维问答 Or would using the key chain or sqlcypher be able to provide encryption and avoid the CCATS paper work.

In my app, i dont see any issue with 56 bit security and i dont assume any issue with a symmetric key solution.

In short: I can't find any good example of how to use 56bit DES symmetric encryption for my ios 4.2 app (This is to avoid the CCATS hassle)

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Why don't you use the Security.framework?