<title>Novel secret-key watermarking system</title>

Abstract

Most watermarking systems available have only a secret key, which can not be public. But in some applications watermark needs to be retrieved by public keys. How to generating public keys without weaken the performance of the private key is a key problem. In this paper a secret key watermarking system is designed, in which a novel method of generating public keys is proposed. The identifier (ID) embedded can be reliably retrieved using public keys without resorting to the original data. Because only part of embedding information is used in public keys, the above problem is successfully solved. Experimental results show its security and validity.

Security Enhancement for Lightweight JPEG 2000 Transparent Encryption

“…The approach, which integrates encryption with compression, has the advantage that the overhead in computational complexity is low and the amount of information to be encrypted is small. The used parameterization for biorthogonal wavelet filters is integrated with the wavelet lifting scheme [15]. It is based on the combination of the lifting steps of the 9/7 wavelet [16] with conditions of the perfect reconstruction theorem [17] and the symmetric properties of the 9/7 wavelet.…”