Secretcodes(密碼)keepmessagesprivate。Banks,companies,andg...
問題詳情：Secretcodes(密碼)keepmessagesprivate。Banks,companies,andgovernmentagenciesusesecretcodesindoingbusiness,especiallywheninformationissentbycomputer. Peoplehaveusedsecretcodesforthousandsofye...