Cryptology embraces two branche: Cryptanalysis & Cryptography
6 mains concepts of cryptography:
Find false randomness (not a proof to true randomness)
Example: Entropy = 7.980627 bits per character.
Optimum compression would reduce the size of this 51768 character file by 0 percent. Chi square distribution for 51768 samples is 1542.26, and randomly would exceed this value less than 0.01 percent of the times. Arithmetic mean value of data bytes is 125.93 (127.5 = random). Monte Carlo value for Pi is 3.169834647 (error 0.90 percent). Serial correlation coefficient is 0.004249 (totally uncorrelated = 0.0).