25th Annual Symposium onFoundations of Computer Science, 1984. (1984)

Singer Island, FL

Oct. 24, 1984 to Oct. 26, 1984

ISBN: 0-8186-0591-X

pp: 495-503

J. Grollmann , Universitat Dortmund

ABSTRACT

The first part of this paper gives results about promise problems. A "promise problem" is a formulation of a partial decision problem that is useful for describing cracking problems for public-key cryptosystems (PKCS). We prove that every NP-hard promise problem is uniformly NP-hard, and we show that a number of results and a conjecture about promise problems are equivalent to separability assertions that are the natural analogues of well-known results in classical recursion theory. The conjecture, if it is true, implies nonexistence of PKCS having NP-hard cracking problems. The second part of the paper studies more appropriate measures for PKCS. Among the results obtained are the following: One-way functions exist if an only if P /spl ne/ U and one-way functions f such that range f /spl epsiv/ P exist if and only if U /spl cap/ co-U /spl ne/ P. It will allow that there exist PKCS that cannot be cracked in polynomial time (and that satisfy other reasonable assumptions) only if P /spl ne/ U.

INDEX TERMS

CITATION

A. Selman and J. Grollmann, "Complexity Measures For Public-Key Cryptosystems,"

*25th Annual Symposium onFoundations of Computer Science, 1984.(FOCS)*, Singer Island, FL, 1984, pp. 495-503.

doi:10.1109/SFCS.1984.715952

CITATIONS