Changwook Kim

Learn More
Kim, C. and I.H. Sudborough, On reversal-bounded picture languages, Theoretical Computer Science 104 (1992) 185-206. For an integer k >O, a k-reversal-bounded picture language is a chain-code picture language which is described by a language L over the alphabet R= {u,d,r, I} such that, for every word x in L, the number of alternating occurrences of r’s and(More)
Recently, Lee et al. [S.W. Lee, H.S. Kim, K.Y. Yoo, Improvement of Lee and Lee s authenticated key agreement scheme, Appl. Math. Comput., in press] showed that Lee–Lee password-based authenticated key agreement scheme [N.Y. Lee, M.F. Lee, Further improvement on the modified authenticated key agreement scheme, Appl. Math. Comput. 157 (2004) 729–733] is(More)