We propose a modified version of the chaotic cryptographic method based on
iterating a logistic map. Simulation results show that the distribution of
the cipher-text is flatter and the encryption time is shorter. Moreover, th
e trade-off between the spread of the distribution of ciphertext and the en
cryption time can be controlled by a single parameter. (C) 2001 Elsevier Sc
ience B.V. All rights reserved.