Secretcodes(密码)keepmessagesprivate。Banks,companies,andg...
问题详情：Secretcodes(密码)keepmessagesprivate。Banks,companies,andgovernmentagenciesusesecretcodesindoingbusiness,especiallywheninformationissentbycomputer. Peoplehaveusedsecretcodesforthousandsofye...