Secretcodes(密碼)keepmessagesprivate.Banks,companies,and...
問題詳情： Secretcodes(密碼)keepmessagesprivate.Banks,companies,andgovernmentagenciesusesecretcodesindoingbusiness,especiallywheninformationissentbycomputer.Peoplehaveusedsecretcodesforthousandsofyears...