Scientific article
Open access

Cryptographic copyright protection for digital images based on watermarking techniques

Published inTheoretical computer science, vol. 226, no. 1-2, p. 117-142
Publication date1999

In this paper we present a new approach for the secure and robust copyright protection of digital images. We describe a system for generating digital watermarks and for trading watermarked images. The system is based on a new watermarking technique, which is robust against image transformation techniques such as compression, rotation, translation, scaling and cropping. It uses modulation of the magnitude components in Fourier space to embed a watermark and an accompanying template and, during watermark extraction, reads a template in the log polar transform of the frequency domain. The template is used for analyzing scaling and rotation suffered by the watermarked stego-image. The detection of the watermarks is also possible without any need for the original cover-image. In addition, the system applies asymmetric cryptographic protocols for different purposes, namely embedding/detecting the watermark and transferring watermarked data. The public key technique is applied for the construction of a one-way watermark embedding and the verification function to identify and prove the uniqueness of the watermark. Legal dispute resolution is supported for the multiple watermarking of a digital image without revealing the confidential keying information.

  • Copyright protection
  • Digital images
  • Digital watermark
  • Asymmetric cryptography
  • Robustness
Citation (ISO format)
O’RUANAIDH, Joséph John et al. Cryptographic copyright protection for digital images based on watermarking techniques. In: Theoretical computer science, 1999, vol. 226, n° 1-2, p. 117–142. doi: 10.1016/S0304-3975(99)00069-9
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Article (Published version)
ISSN of the journal0304-3975

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