54 citations · 57 across the 2 of their papers we have counts for
5 papers
Randomness Evaluation and Hardware Implementation of Nonadditive CA-Based Stream Cipher
Song-Ju Kim, Ken Umeno
We shall review the cellular automaton(CA)-based pseudorandom-number generators (PRNGs), and show that one of these PRNGs can generate high-quality random numbers which can pass al…
Corrections of the NIST Statistical Test Suite for Randomness
Song-Ju Kim, Ken Umeno, Akio Hasegawa
It is well known that the NIST statistical test suite was used for the evaluation of AES candidate algorithms. We have found that the test setting of Discrete Fourier Transform tes…
Improvement of SNR with Chaotic Spreading Sequences for CDMA
Ken Umeno, Ken-ichi Kitayama
We show that chaotic spreading sequences generated by ergodic mappings of Chebyshev orthogonal polynomials have better correlation properties for CDMA(code division multiple access…
Chaotic Monte Carlo computation: a dynamical effect of random-number generations
Ken Umeno
It is shown that superefficient Monte Carlo computations can be carried out by using chaotic dynamical systems as non-uniform random-number generators. Here superefficiency means t…
Integrability and Computability in Simulating Quantum Systems
Ken Umeno
An impossibility theorem on approximately simulating quantum non-integrable Hamiltonian systems is presented here. This result shows that there is a trade-off between the unitary p…