slide on e-cash

8/9/2019 Slide on e-cash

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Welcome ToEveryone

HERBINGER


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E-CASHElectronic Cash


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Exam Roll(ascendingorder)

ClassRoll

Name of the Members RegistrationNumber

1003026 26 M! Mar"#$ Islam %2&'(

100302 2) S*! A+,#llah %2&'2

100302! 2 M,! .ony Bh#yian %2&'/

100302" 2& M,! .ahan .e+ %2&''

100303# /' Na"m#l H#,a Ria, %2&'&

Group Member Details


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$ntroduction

The aim o0 this 1or$ is to choose an, imlement a ayment system that can+e easily

inte3rate, in a mo+ile ,evice! Amon3 the main e4ecte, characteristics5this electronic #rsem#st allo1 ,irect client-to-client ayments5 e-shoin3 over Internet5 an,the transactionsm#st +e achieve, anonymo#sly!


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Inventory o0 e4istin3 systems

(! The +#yer 3ives an or,er o0 ayment to the seller!2! The seller sen,s an a#thoriation to his +an$!/! The cre,itor +an$ sen,s the a#thoriation to the ,e+tor+an$!'! The money is trans0erre, 0rom the +#yer7s acco#nt tothe seller7s acco#nt!

8! The +#yer 3ets a noti9cation 0rom the +an$!


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E-cash 1or$s

E-cash is a system that tries to ta$e arty o0 +oth sets o0 a,vanta3es5

allo1in3 0ree-o0-char3eayments an, micro-ayments5 1or$in3 0or sen,in3 on the Internet5 an,all this +yreservin3 the anonymity o0 the +#yer! Instea, o0 rinte, notes5 the i,ea isto #se electronicnotes! There0ore a note has no hysical s#ort anymore: a note is act#ally

only in0ormation!In .ava 1e reresent s#ch a note 1ith a Bi3 Inte3er5 1hich is an #nlimite,-sie inte3er! Theal3orithm ,escri+e, later in this chater sho1s ho1 cryto3rahy ma$ess#ch a system0easi+le an, #n-0or3ea+le!


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E Cash Gen

The e-cash system ,e9nes three actors< the +an$5 the +#yer an, the seller! Ina real-li0e casethe +#yer an, the seller co#l, +e imlemente, +y the same client5 so that aerson can #se his

e-#rse as 1ell 0or +#yin3 thin$s an, cash money 0rom other #sers =li$e 1e,o it 1ith conventional notes an, coins>! B#t it is easier here to st#,y eachcase searately! We have one seci9c main class 0or each actor< ECashBan$0or the +an$5 ECashB#yer 0or the +#yer an, ECashSeller 0or the seller!Beca#se they have several roerties in common they are alle4tension o0 a more 3eneric class5 ECashGen!


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The +an$

A +an$ ro3ram creates an instance o0 the ECashBan$ class! Its sin3leconstr#ctor re?#ests an ECashBan$@istener as a arameter! The class 1hich

imlements this inter0ace =ECashBan$@istener> m#st ,e9ne the 0ollo1in3metho,s< 1hich ret#rns tr#e i0 the ass1or, correson, 1ith the acco#nt n#m+er5

0alse other1ise! 1hich ret#rns the availa+le amo#nt in the seci9e, +an$ acco#nt!

1hich is calle, a0ter a client ,eosite, some money on his +an$ acco#nt! 1hich is calle, a0ter a client 1ith,re1 some money 0rom his +an$ acco#nt!


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&he bu'er

A +#yer #ses the ECashB#yer class! Its constr#ctor re?#ests as a arameter aclassimlementin3 the ECashB#yer@istener inter0ace5 1hich ,e9nes the 0ollo1in3

metho,

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