IT430 Quiz

 Question # 1 of 10 ( Start time: 05:24:12 PM )
Total Marks: 1

The length of a message digest is ________.

Select correct option:

32 to 64 bits


64 to 128 bits


128 to 256 bits


256 to 512 bit


Virtual PIN Payment System requires both merchant and buyer to register with _______________.

Select correct option:


Auto Clearing House (ACH)


First Virtual (FV)


DSS (Digital Signature


is necessary for both buyer and seller to have their account in the ---------E-bank.

Select correct option:

Same


Separate


Key version represents public key by

Select correct option:

Buyer


Seller


E-Bank (page 116)


Certification Authority

If a key is 4 bit in length, how many unique key values are possible?

Select correct option:

4


8


16

32


Which of the following represents correct sequence of steps for electronic check payment system?

Select correct option:
Payer’s bank ? Payee ? Payee’s bank ? Payer


The serial # generated by the cyberwallet gets multiplied by blinding factor ‘r’ which is known only to the ___________.

Select correct option:

Bank


Merchant


Client


None


What is basic advantage of symmetric algorithms?

Select correct option:

Symmetric key does not use any encryption


Symmetric algorithms are faster


Symmetric


Attacker attempts to decrypt the message with every possible key in ______.

Select correct option:


Key Search Attacks


Cryptanalysis



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IT430 Ass Solution

Question No. 1: Write down advantages and disadvantages of “Virtual PIN Payment System”.

Answer: Virtual PIN payment system is one of the earliest credit card based system. This system does not involve use of encryption and payment is made through credit card.

There are certain advantages and disadvantages associated with this system

Advantages:

• No special software or hardware in needed at buyer or seller side

• First Virtual has very low processing fee as compared to other Internet payment schemes or even straight credit card processing

• Purchases are essentially anonymous. The merchant is never given the buyer's name from First Virtual

• Buyers are fully protected from fraud. No charges are processed against their account without their confirmation

Disadvantages:

• Pre-registration with First Virtual in set up is mandatory for buyer and seller

• Most risk is borne by merchant because goods are delivered by merchant before actual payment

• Long waiting period between sale and actual payment made to merchant

_________________________________

Question No. 2: How stolen credit cards can be used for fraud in Virtual PIN Payment System?

Answer: Virtual PIN payment system is a credit card based payment system. Both merchant and buyer need to register with First Virtual (FV). When the customer makes an order, they give the merchant their virtual PIN. The merchant then contacts First Virtual, quotes them the PIN and asks for the money. First Virtual send the customer an e-mail asking for their confirmation, customer either replies YES, NO or Fraud. If the answer indicates “fraud” it means that the goods were never ordered. In such an eventuality the First Virtual Internet Payment Server System (FVIPSS) immediately blacklists Virtual PIN so that it cannot be used in the future. In case of fraud indication it means buyer to whom PIN actually belongs has not made the order and somebody might have stolen the PIN and misused it. There is a said waiting period to answer the e-mail about indication of transaction and in case of no reply FV proceeds the payment, in such a case since no fraud indication is made by buyer the stolen Virtual PIN can then be used for transaction. Similarly a stolen credit card number can also be used to set up Virtual PIN associated with an email address controlled by the attacker to carry out bogus transactions.

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