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This article is cited in 1 scientific paper (total in 1 paper)
Mathematical Methods of Cryptography
Watermarking ciphers
G. P. Agibalov National Research Tomsk State University, Tomsk, Russia
Abstract:
In order to protect both data confidentiality and legality, a concept of a watermarking cipher (also called a w-cipher) is defined. The main idea of this cjncept is as follows: the transformation of a plaintext $x$ by the composition of encryption and decryption operations using some encryption and decryption keys yields a proper text $x'$ containing a unique watermark $w$. The encryption and decryption keys in the w-cipher are connected with each other and with the given watermark $w$ in some way. In contrast with the ciphers usually studied in cryptography, the encryption function in a w-cipher is not compulsorily invertible. Thus in fact w-ciphers are not ciphers in the known sense of the word, but the ciphers are w-ciphers of a certain partial type, and all terms, notions and notations related to ciphers are quite applicable to w-ciphers. It is shown how data watermarking can be performed by applying a w-cipher in such a way that the concealment of a watermark into a plaintext is accomplished by this w-cipher either in the encryption or in the decryption processes. Some examples of w-ciphers constructed on the basis of symmetric stream ciphers are presented in the paper.
Keywords:
data protection, encryption, watermarks, watermarking ciphers, stream ciphers.
Citation:
G. P. Agibalov, “Watermarking ciphers”, Prikl. Diskr. Mat., 2016, no. 1(31), 62–66
Linking options:
https://www.mathnet.ru/eng/pdm535 https://www.mathnet.ru/eng/pdm/y2016/i1/p62
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Abstract page: | 214 | Full-text PDF : | 59 | References: | 39 |
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