We present a new cryptosystem based on ideal arithmetic in quadratic orders. The method of our trapdoor is diierent from the Diie-Hellman key distribution scheme or the RSA cryp-tosystem. The plaintext m is encrypted by mp r , where p is a xed element and r is a random integer, so our proposed cryptosystem is a probabilistic encryption scheme and has the ho-momorphy property. The most prominent...

Public-key cryptography is fast becoming the foundation for those applications that require security and authentication in open networks. But the widespread use of a global public-key cryptosystem requires that public-key certificates are always available and up-to-date. Problems associated to digital certificates management, like storage, retrieval, maintenance, and, specially, revocation, req...

A new approach for identifying a friend aircrafts from foe (IFF) using public-key cryptosystem is introduced. Two schemes of public-key cryptosystem namely: RSA and knapsack public-keys are considered, which provide higher security than conventional identification methods. The practical aspects of using such systems for aircraft identification purposes are discussed. Computer simulation example...

Inspired by fast correlation attacks on stream ciphers, we present a stream cipher-like construction for a public-key cryptosystem whose security relies on two problems: finding a low-weight multiple of a given polynomial and a Hidden Correlation problem. We obtain a weakly secure public-key cryptosystem we call TCHo (as for Trapdoor Cipher, Hardware Oriented). Using the Fujisaki-Okamoto constr...

In this paper, we propose a new public key cryptosystem in non-commutative group over ring, using hard problem, Factorization with Discrete Logarithm Problem (FDLP). The security analysis of the proposed scheme is discussed and it shown that system secure.

A cryptosystem is a structure or scheme consisting of set algorithms that converts plaintext to ciphertext encode decode messages securely. The points at computer system employs cryptography. Cryptosystems are classified by the method they use encrypt data. One them symmetric key encryption. While algorithm uses same for encryption and decryption, asymmetric public-key different keys. So it mor...