CWSS Prelim P1 CP

COMMONWEALTHSECONDARYSCHOOLPRELIMINARYEXAMINATION2024 COMPUTINGPaper1(Theory) Name:___________________________________( ) Class:___________ SECONDARYFOUREXPRESS Wednesday28August2024SECONDARYFIVENORMALACADEMIC7155/01 1130–13302hours READTHESEINSTRUCTIONSFIRST Writeyourname,indexnumberandclassonalltheworkyouhandin.Writeindarkblueorblackpen.YoumayuseanHBpencilforanydiagramsorgraphs.Donotusestaples,paperclips,glueorcorrectionfluid. Approvedcalculatorsareallowed.Candidateswillansweronthequestionpaper. Answerallquestions. Thenumberofmarksisgiveninbrackets[]attheendofeachquestionorpartquestion.Youshouldshowallyourworking.Thetotalnumberofmarksforthispaperis80. ForExaminer’sUse Total 80 Thispaperconsistsof13printedpagesincludingthecoverpage.[Turnover

2 1 Acompanydealingwithdigitallocksusesastandardtouchscreenkeypadforitscustomerstoentertheir4-digitpincodestounlockthelocks.(a) Statetworeasonswhythepincodescanbeeasilystolen. 1....................................................................................................................... .......................................................................................................................... 2....................................................................................................................... .......................................................................................................................... [2] (b) Suggesttwowaystoprotectthepincodesfrombeingstolen. 1....................................................................................................................... .......................................................................................................................... 2....................................................................................................................... .......................................................................................................................... [2] Thecompanyprovidesanonlineserviceforcustomerswhoforgettheirpincodestologintothesystemtoresettheirpincodes. (c) Describethedifferencebetweenauthenticationandauthorisation. .......................................................................................................................... .......................................................................................................................... .......................................................................................................................... ..........................................................................................................................[2] (d) Explainwhyauthenticationisimportantforthisserviceandsuggestonemethodtoenhancetheauthentication. .......................................................................................................................... .......................................................................................................................... ..................