In last years, low-dimensional and high-dimensional chaotic systems have been
implemented in cryptography. The efficiency and performance of these nonlinear systems
play an important role in limited hardware implementations. In this context, low-dimensional
chaotic systems are more attractive than high-dimensional chaotic systems to produce the
pseudorandom key stream used for encryption purposes. Although low-dimensional chaotic
maps present some security disadvantages when they are used in cryptography, they are …

In this paper, a security analysis of the novel pseudorandom number generator based on
pseudorandomly enhanced logistic map is made, which reveals the existence of serious
security problem. Although the assumed safety of this pseudorandom number generator
(PRNG) is estimated at 2^ 128 2 128, it is possible to carry out successful brute-force attack
with the complexity of about 2^ 70 2 70. For this reason, analyzed PRNG cannot be
considered safe for the use in cryptographic systems.