BENEFICIAL CHAOS

Two novel applications of chaotic dynamics for the construction of sim ple highly accurate measuring devices and for secure image ciphering a re presented. We suggest to utilize the sensitivity to initial conditi ons as a mechanism for accurate measurements. We describe an algorithm which takes low accuracy time evolution data of a chaotic circuit to reconstruct the initial condition (signal to be measured) with a much higher accuracy. In the second part of the paper, the baker map and th e cat map are used to create a complex permutation of pixels in a digi tal image. The ciphering/deciphering process, and the security of the cipher are discussed.