International Association for Cryptologic Research

International Association
for Cryptologic Research

CryptoDB

Hyun Soo Nam

Publications

Year
Venue
Title
2003
EPRINT
A Cryptanalysis of the Original Domingo-Ferrer's Algebraic Privacy Homomophism
Jung Hee Cheon Hyun Soo Nam
We propose a cryptanalysis of the original Domingo-Ferrer's algebraic privacy homomorphism. We show that the scheme over $\Z_n$ can be broken by $d+1$ known plaintexts in $O(d^3\log^2 n)$ time when it has $d$ times expansion through the encryption. Furthermore even when the public modulus $n$ is kept secret, it can be broken by $d+2$ known plaintexts in time at most $O(d^5\log^2(dn))$.

Coauthors

Jung Hee Cheon (1)