Relationship between Standard Model Plaintext Awareness and Message Hiding


IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E91-A   No.1   pp.244-261
Publication Date: 2008/01/01
Online ISSN: 1745-1337
DOI: 10.1093/ietfec/e91-a.1.244
Print ISSN: 0916-8508
Type of Manuscript: Special Section PAPER (Special Section on Cryptography and Information Security)
Category: Security Notions
plaintext awareness,  standard model,  

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Recently, Bellare and Palacio defined the plaintext awareness (PA-ness) in the standard model. In this paper, we study the relationship between the standard model PA-ness and the property about message hiding, that is, IND-CPA. Although these two notions seem to be independent at first glance, we show that PA-ness in the standard model implies the IND-CPA security if the encryption function is oneway. By using this result, we also showed that "PA + Oneway ⇒ IND-CCA2." We also show that the computational PA-ness notion is strictly stronger than the statistical one.