Visual cryptography is a special type of secret sharing. Two models of visual cryptography
have been independently studied: 1) deterministic visual cryptography, introduced by Naor …

This paper first introduces a (k, n)-sharing matrix S (k, n) and its generation algorithm.
Mathematical analysis is provided to show its potential for secret image sharing. Combining …

Authentication is the important issue over the internet. It results in need of robust security
services and schemes. This paper proposes the Shamir Secret Sharing Scheme along with …

Though the monochrome (black and white) visual cryptography has a very rich literature, a
very few papers have been published for the construction of general access structure. In this …

The transition of visual secret sharing from a black & white secret image to a color image is
not straight-forward. There are several models of color superposition principle. In this paper …

In this paper we propose the use of colors to improve visual cryptography schemes for black-
and-white secret images. The resulting model is called colored-black-and-white visual …

The research on color Visual Cryptographic Scheme (VCS) is much more difficult than that of
the black and white VCS. This is essentially because of the fact that in color VCS, the rule for …

Visual cryptography (VC) is a new form of secret sharing technique, where no computation is
needed for decryption. The decryption can be done by stacking the shares or simple …

This chapter aims to help the readers to get familiar with the classical VC algorithms. These
algorithms are also stepstones for developing more complicated algorithms in later chapters …

User authentication is the most important security services for communication purpose.
Group Authentication authenticates all users belonging to the same group is proposed in …