We propose associative one-way functions as a new cryptographic paradigm for exchanging secret keys and for signing digital documents. First, we precisely deene these functions and establish some of their basic properties. Next, generalizing a theorem of Selman, we constructively prove that they exist if and only if P 6 = NP. In addition, we exhibit an implementation based on integer multiplica...

We propose a quantum blind signature scheme that achieves perfect security under the assumption of an honest offline repository. The security of the protocol also relies on perfect private quantum channels, which are achievable using quantum one-time pads with keys shared via a QKD protocol. The proposed approach ensures that signatures cannot be copied and that the sender must compromise to a ...

Thin films of organic material produced in a dusty plasma in N2–CH4 mixtures are deposited on silicon substrates. The real (n) and imaginary (k) parts of the complex refractive index are determined using the spectroscopic ellipsometry technique in the 370-1000 nm wavelength range. The optical index depend strongly on the methane concentrations: k values decreases with initial CH4 concentration,...

An arbitrated quantum signature (AQS) scheme is demonstrated via the improved quantum chaotic encryption algorithm with the quantum one-time pad based on chaotic operation string. In this scheme, the signatory signs the message and the receiver verifies the signature's validity with the aid of the arbitrator who plays a crucial role when a dispute arises. Analysis shows that the signature can n...

Online Internet applications are used widely all over the world. Especially the secured applications like banking and financial applications the basic authentication is password and one time password verification. The new system is facilitated with signature based authentication and graphical pattern authentication based on Multimodal Verification System. The new system uses contourlet based tr...

One-time signature schemes have found numerous applications: in ordinary, on-line/off-line, and forward-secure signatures. More recently, they have been used in multicast and broadcast authentication. We propose a one-time signature scheme with very efficient signing and verifying, and short signatures. Our scheme is well-suited for broadcast authentication, and, in fact, can be viewed as an im...

In the original ElGamal signature scheme and it’s variants, two secret integers-private key and one-time secret key are required to produce a signature on a message, m. The private key of a system will be used throughout the life of the system whereas the one-time secret key only be used once and must be regenerated (different one-time secret key) when signing different message. This paper intr...

This article concerned on the study of signature submanifolds for curves under Lie group actions SE(2), SA(2) and for surfaces under SE(3). Signature submanifold is a regular submanifold which its coordinate components are differential invariants of an associated manifold under Lie group action, and therefore signature submanifold is a key for solving equivalence problems.