BTW truly random numbers can not be used for live communications encryption as they can not be reproduced by the recipient UNLESS they have a EXACT replica of the random numbers or its audio image in a recording (See: American SIGSALY machine during WW2). However pseudo-random numbers can be reproduced live by the recipient via prearrangement but not easily by an outsider (See: German ENIGMA machine also WW2 vintage).

POTUS Thomas Jefferson invented a really amazing encryption machine in 18th century using a quasi-pseudo-random arrangement which utilized the ancient encryption art of Steganography. (See: Jefferson Wheel Cypher). It helped us beat the Brits here in USA and abroad. :P