IT430 Assignment 4 fall 2012 Solution

Assignment No. 04

Semester: Fall 2012

IT430 E-Commerce

 

Question no 1:

Answer:

r = (23) mod 4 )+ 2
modulas operator 4 = 01
means mod 4 = 01
r = ((01) mod 4 ) + 2
m = 7 and e = 3
Serial # 00100


Message/Code sent by you to bank after your signatures
Serial # r^e)^d (mod m ) r = 1.365
Message/Code minted by bank and sent to you
(00100 ((23) mod e 4)⁺²) (mod 7)
Message Code decoded by you
[(Serial # r^e)^d (mode m)]/r
1.365 ((23)mod 4)⁺² = 1.365/5 = 0.273
Coin
coin =(Serial #)([Serial # r^e)^d(mod m)]r)
(Serial # r^e) ^d(mod m)) = (00100) (0.273) (1.365)

 

 

              

Message/Code sent by you to bank after your signatures	Message/Code minted by bank and sent to you	Message Code decoded by you	Coin	Why is there anonymity factor achieved by customer (One sentence answer)	Why we have taken d=1/3 and e=3
Message/Code sent by you to bank after your signatures Serial # re)d (mod m ) r = 1.365	Message/Code minted by bank and sent to you (00100 ((23) mod e 4)+2) (mod 7)	Message Code decoded by you [(Serial # re)d (mode m)]/r 1.365 ((23)mod 4)+2 = 1.365/5 = 0.273	Coin coin =(Serial #)([Serial # re)d(mod m)]r) (Serial # re) d(mod m)) = (00100) (0.273) (1.365)	There anonymity factor achieved by customer because Bank does not know the serial number because of blinding factor ‘r’	The reason of taking is this ‘e’ is given and ‘d’ always inverse of ‘e