Sunday, 20 January 2013
Assignment
Question no 1: 20 Marks
Assume you as a student is playing role of customer in E-cash payment system in which anonymity of the buyer is
kept in view. You have purchased online Electronic Project essentials from online Supporting Company ABC that
has also registered its account in the E- Cash bank.
You have to pay to merchant using the mentioned e-cash system following facts help you to calculate your coins
minting and paying to customer anonymously.
For signatures you have to adopt the following mathematical expression:
Steps for Solving the Problem:
Serial #.re (Mod m)
“r” =((your ID ‘s least significant right most two digits) Mod 4)+2
Here “r” will vary according student to student based upon their VU ids and Mod here mean well
known “modulus” operator.
For example in case of your id is BC1304017001 pick the last two digits here these are 01 and take Modulus
operator with digit “4” “01” Mod 4=01 and apply the attained “r” in the minting and depositing stages of the
payment to Merchant all other factors are same for all students only the variation will be attained according to
factor “r” which will be calculated according to the above mentioned formula.
Public key of the bank consists of modulus ‘m’ and a no. ‘e’. Here for simplicity of calculation you have to takw
Question no 1: 20 Marks
Assume you as a student is playing role of customer in E-cash payment system in which anonymity of the buyer is
kept in view. You have purchased online Electronic Project essentials from online Supporting Company ABC that
has also registered its account in the E- Cash bank.
You have to pay to merchant using the mentioned e-cash system following facts help you to calculate your coins
minting and paying to customer anonymously.
For signatures you have to adopt the following mathematical expression:
Steps for Solving the Problem:
Serial #.re (Mod m)
“r” =((your ID ‘s least significant right most two digits) Mod 4)+2
Here “r” will vary according student to student based upon their VU ids and Mod here mean well
known “modulus” operator.
For example in case of your id is BC1304017001 pick the last two digits here these are 01 and take Modulus
operator with digit “4” “01” Mod 4=01 and apply the attained “r” in the minting and depositing stages of the
payment to Merchant all other factors are same for all students only the variation will be attained according to
factor “r” which will be calculated according to the above mentioned formula.
Public key of the bank consists of modulus ‘m’ and a no. ‘e’. Here for simplicity of calculation you have to takw
