Cryptology ePrint Archive: Report 2003/231

Public-Key Steganography with Active Attacks

Michael Backes and Christian Cachin

Abstract: A complexity-theoretic model for public-key steganography with active attacks is introduced. The notion of steganographic security against adaptive chosen-covertext attacks (SS-CCA) and a relaxation called steganographic security against publicly-detectable replayable adaptive chosen-covertext attacks (SS-PDR-CCA) are formalized. These notions are closely related to CCA-security and PDR-CCA-security for public-key cryptosystems. In particular, it is shown that any SS-(PDR-)CCA stegosystem is a (PDR-)CCA-secure public-key cryptosystem and that an SS-PDR-CCA stegosystem can be realized from any PDR-CCA-secure public-key cryptosystem with pseudorandom ciphertexts.

Category / Keywords: foundations / steganography, information hiding, public-key cryptography

Date: received 6 Nov 2003, last revised 26 Aug 2004

Contact author: cca at zurich ibm com

Available format(s): Postscript (PS) | Compressed Postscript (PS.GZ) | PDF | BibTeX Citation

Note:

Version: 20040826:194729 (All versions of this report)

Short URL: ia.cr/2003/231

Discussion forum: Show discussion | Start new discussion