E – Commerce MCQs

sends message key using public key encryption using DES and hashed message using public key encryption
sends message using public key encryption and hashed message using DES
sends both message and hashed message using DES
sends both message and hashed message using public key encryption

Answer

compressing it
expanding it
scrambling it to preserve its security
hashing it

Answer

i and ii
ii and iii
i and iii
iii and iv

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the merchant’s risk is high as he accepts encrypted credit card
the credit card company should check digital signature
the bank has to keep a database of the public keys of all customers
the bank has to keep a database of digital signatures of all customers

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Cannot be broken in reasonable time using presently available computers.
Can be broken only if the algorithm is known using even slow computer.
Can be broken with presently available high performance computers.
It is impossible to break ever

Answer