The conference-key agreement protocol is a mechanism for generating a common session key among the authorized conference members. The common session key is used to encrypt communication messages transmitted over an open network. Inspired by traditional key agreement protocols and threshold cryptosystems, we have proposed a novel threshold conference-key agreement protocol in this paper. In the ...

In this paper, a novel key management model and algorithm for two-tier architecture network are proposed based on elliptic curve cryptosystem (ECC) combined with public key (CPK) technology, verifiable secret sharing technology, and two-tier architecture network technology. This novel key management algorithm is composed of several sub-algorithms, such as key generation, key update, nodes joini...

One-way functions are widely used for encrypting the secret in public key cryptography, although they are regarded as plausibly one-way but have not been proven so. Here we discuss the public key cryptosystem based on the system of higher order Diophantine equations. In this system those Diophantine equations are used as public keys for sender and recipient, and both sender and recipient can ob...

We propose a cryptosystem that has an inherent key escrow mechanism. This leads us to propose a session based public verifiable key escrow system that greatly improves the amount of key material the escrow servers has to keep in order to decrypt an encryption. In our scheme the servers will only have a single secret sharing, as opposed to a single key from every escrowed player. This is done wh...

The current work proposes a new scheme for the replication of authentication services in Kuperee based on a public key cryptosystem, in response to the two main shortcomings of the traditional single server solutions, namely those of low availability and high security risks. The work represents further developments in the Kuperee authentication system. The Kuperee server is presented in its bas...

This paper presents a cost-effective private-key cryptosystem for color images. The scheme allows for secret sharing of the color image by generating two color shares with dimensions identical to those of the original. Encryption is performed via simple binary operations realized at the image bit-levels altering both the spectral correlation among the RGB color components and the spatial correl...

A quantum cryptography scheme for lossy channel is proposed which does not employ quantum memory. The scheme also does not use quantum codes and is rather simple for practical implementation. The goal of quantum cryptography is to secretly distribute the key (a string of bits) between the two spatially separated legitimate users. The existing quantum cryptography schemes can be classified into ...

A property of the NTRU public-key cryptosystem is that it does not provide perfect decryption. That is, given an instance of the cryptosystem, there exist ciphertexts which can be validly created using the public key but which can’t be decrypted using the private key. The valid ciphertexts which an NTRU secret key will not correctly decipher determine, up to a cyclic shift, the secret key. In t...

A biometric sensor device is the potential product of the forthcoming biotechnology for real-time tracking of physiological signals to support various healthcare and medical services such as homecare medical service, prevention, diagnosis, and follow-up services. A key agreement scheme between biometric sensor devices is a fundamental requirement to support the security of the healthcare and me...

We propose a public-key cryptosystem which is derived from the Paillier cryptosystem. The scheme inherits the attractive homomorphic properties of Paillier encryption. In addition, we achieve two new properties: First, all users can use the same modulus when generating key pairs, this allows more efficient proofs of relations between different encryptions. Second, we can construct a threshold d...