$ dd if=/dev/urandom bs=512 count=1 2>/dev/null | base64 -w 0 | ent
    Entropy = 5.933850 bits per byte.
    
    Optimum compression would reduce the size
    of this 684 byte file by 25 percent.

    Chi square distribution for 684 samples is 2310.15, and randomly
    would exceed this value 0.01 percent of the times.
    
    Arithmetic mean value of data bytes is 85.0731 (127.5 = random).
    Monte Carlo value for Pi is 4.000000000 (error 27.32 percent).
    Serial correlation coefficient is -0.018269 (totally uncorrelated = 0.0).

I don't have the means to convert base64 to 52 but the result shouldn't be much different.