In 1999, Coron, Naccache and Stern discovered an existential signature forgery for two popular rsa signature standards, iso/iec 97961 and 2. Following this attack iso/iec 9796-1 was withdrawn. iso/iec 9796-2 was amended by increasing the message digest to at least 160 bits. Attacking this amended version required at least 2 operations. In this paper, we exhibit algorithmic refinements allowing ...

In this paper, we proposed fast exploration method of copy-move forgery image. We proposed a new simple search algorithm using a half block size for copy-moved forgery image detection. Our algorithm reduced computational complexity more than conventional algorithms. We didn’t use 8x8 pixel block exhaustive search method and frequency algorithm to reduce computational complexity in this paper.

In this paper, we analyze two proxy signatures scheme [1], [2] proposed by Lal and Awasthi and found that both the schemes suffer with the security flaws. The scheme [1] suffers with proxy signer’s forgery attacks and misuse of original signer’s delegated information. The other scheme [2] suffers with original signer’s forgery attack, proxy signer’s undeniability and misuse of delegated informa...

The use of digital photography has increased over the past few years, the trend which opens the door for new and creative ways to forge images. Now a day’s several software’s are available that are used to manipulate image so that the image is look like as original. Images are used as authenticated proof for any crime and if these image does not remain genuine than it will create a problem. Det...

signatures: the functional approach and the parametric approach. This paper presents a new approach for dynamic handwritten signature verification (HSV) using the Neural Network with verification by the Conjugate Gradient Neural Network (NN). It is yet another avenue in the approach to HSV that is found to produce excellent results when compared with other methods of dynamic. Experimental resul...