Restrictive blind signatures allow a recipient to receive a blind signature on a message not know to the signer but the choice of message is restricted and must conform to certain rules. Partially blind signatures allow a signer to explicitly include necessary information (expiration date, collateral conditions, or whatever) in the resulting signatures under some agreement with receiver. Restri...

A blind watermarking technique embedding a digital image signature for authentication is developed. The signature algorithm is rst implemented in the discrete wavelet transform (DWT) domain and is later coupled within the SPIHT compression algorithm. The capacity of the watermarking method is determined by the upper bound on the attainable information bit rate that can be hidden in the image us...

In ordinary digital signature schemes, anyone can verify signatures with signer’s public key. However it is not necessary for anyone to be convinced a justification of signer’s dishonorable message such as a bill. It is enough for a receiver only to convince outsiders of signature’s justification if the signer does not execute a contract. On the other hand there exist messages such as official ...

In this paper, we survey the state of research on Identity Based Blind Signature. We start from reviewing the basic concepts of identity based encryption and blind signature schemes and subsequently review the framework of ID-based blind signature, and classification of ID-based blind signature. Lastly, we discuss the applications of ID-based blind signature. Keywords— Identity Based Encryption...

Digital watermarking denotes the hiding of information in general documents, where the embedded information can be exploited to combat copyright infringements or to verify the integrity of a document. We emphasize that blind watermarking, where the original document is not known to the watermark receiver, can be interpreted as communication with side information at the encoder. Significant impr...

Recently it was shown that, in some situations, blind watermarking can perform as well as watermarking schemes with the host signal available to the decoder. In this paper, blind watermarking of colored Gaussian host signals in the presence of filtering and additive Gaussian noise attacks is discussed. Three suboptimal but practical schemes are compared with a scheme where the host signal is av...

Digital watermark is an active research area that has received a considerable attention in multimedia applications. For most watermark applications, it is often desired to retrieve the embedded information without access to the host data, which is known as blind watermark. Most of previous blind watermark schemes either suffer significantly from host data interference or require expense of stor...

a r t i c l e i n f o a b s t r a c t Keywords: Digital image watermarking Integer wavelet transform Singular value decomposition Wilcoxon signed rank test Digital signature In this paper, a new robust and secure digital image watermarking scheme that can be used for copyright protection is proposed. The scheme uses the integer wavelet transform (IWT) and singular value decomposition (SVD). The...

------------------------------------------------------------------ABSTRACT----------------------------------------------------------------Digital signature scheme is an important research topic in cryptography. An ordinary digital signature scheme allows a signer to create signatures of documents and the generated signatures can be verified by any person. A proxy signature scheme, a variation o...

Digital signature is extensively used in many practical applications as numerous cryptographic services have been proposed. In this paper, we will be the first to propose a signature scheme that integrates the following properties. (1) It is a distributed RSA-type multi-signature. (2) It is a blind and weakly undeniable signature. (3) The modulus used by each participant cosigner is identical. ...