While its official name is `` Rivest Cipher 4 '' , the RC acronym is also known to stand for `` Ron 's Code '' ( see also RC2 , RC5 and RC6 ) . While it is officially termed `` Rivest Cipher 4 '' , the RC acronym is alternatively understood to stand for `` Ron 's Code '' ( see also RC2 , RC5 and RC6 ) .