Digital Implementation of an Improved LTE Stream Cipher Snow-3G Based on Hyperchaotic PRNG

Table 2

Comparison results of NIST tests.

The number of test	The type of test	Regular SNOW-3G [14]	Proposed SNOW-3G based on HC-PRNG
	Frequency (monobit) test	Success	Success
	Frequency test with a block	Success	Success
	Runs test	Fail	Success
	Long runs of ones test	Fail	Success
	Binary matrix rank test	Fail	Success
	Discrete Fourier transform (spectral) test	Fail	Success
	Nonoverlapping template matching test	Fail	Success
	Overlapping template matching test	Fail	Success
	Maurer’s “universal statistical” test	Success	Success
	Linear complexity test	Success	Success
	Serial test	Fail	Success
	Approximate entropy test	Fail	Success
	Cumulative sums (Cusum) test	Success	Success
	Random-excursion test	Success	Success
	Random-excursion-variant test	Success	Success