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What is the ideal system for an encryption scheme? For a pseudorandom permutation the ideal one is a random permutation, for a pseudorandom function the ideal one is a random function. For an encryption scheme do we have a well known application describing an ideal system for an encryption? Maybe the one-time pad?

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An OTP is a good example. Take a look at this answer, particularly the definition it contains – rath Jul 5 '13 at 14:26
    
possible duplicate of definition and meaning of semantic security – rath Jul 5 '13 at 14:28
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If you are concerned about idealization of crypto protocols (of which encryption is a special case), you could look up references about the Universal Composability framework (UC framework). – minar Jul 6 '13 at 8:16
    
Thank you user7423, which references I should look ? – Dingo13 Jul 6 '13 at 8:29
    
You could start with Canetti's paper: eprint.iacr.org/2000/067 – minar Jul 7 '13 at 5:47

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