Publication Details

Bunder, M. W., Nitaj, A., Susilo, W. & Tonien, J. (2016). A new attack on three variants of the RSA cryptosystem. Lecture Notes in Computer Science, (9723), 258-268. Melbourne, Australia 21st Australasian Conference, ACISP 2016.


In 1995, Kuwakado, Koyama and Tsuruoka presented a new RSA-type scheme based on singular cubic curves y2x3+bx2 (mod N) where N = pq is an RSA modulus. Then, in 2002, Elkamchouchi, Elshenawy and Shaban introduced an extension of the RSA scheme to the field of Gaussian integers using a modulus N = PQ where P and Q are Gaussian primes such that p = |P| and q = |Q| are ordinary primes. Later, in 2007, Castagnos proposed a scheme over quadratic field quotients with an RSA modulus N = pq. In the three schemes, the public exponent e is an integer satisfying the key equation ed - k(p2-1) (q2-1) = 1. In this paper, we apply the continued fraction method to launch an attack on the three schemes when the private exponent d is sufficiently small. Our attack can be considered as an extension of the famous Wiener attack on the RSA.



Link to publisher version (DOI)

http://dx.doi.org/DOI: 10.1007/978-3-319-40367-0 16