  The absolute indicator is one of the measures used to determine the
resistance offered by a Boolean function when used in the design of a symmetric
cryptosystem. It was proposed along with the sum of square indicator to
evaluate the quality of the diffusion property of block ciphers and hash
functions. While the behaviour of the sum of square of random Boolean functions
was already known, what remained was the study of the comportment of the
absolute indicator of random Boolean functions. As an application, we show that
the absolute indicator can distinguish a nonrandom binary sequence from a
random one.
