A bank wants to store the account number of its customers (an 8- digit number) in encrypted form on magnetic stripe ATM cards. Discuss the security of the following methods for storing the account number against an attacker who can read the magnetic stripe:

a. Store a cryptographic hash of the account number.
b. Store the ciphertext of the account number encrypted with the bank's public key using a public-key cryptosystem.
c. Store the ciphertext of the account number encrypted with the bank's secret key using a symmetric cryptosystem.

solution:

this situation is called an ip conflict.

data from a server is sent in small bits called packets. in an ip conflict, some packets will end up in one computer while some other packets will end up in another computer.

so…overall none of the computers get the data as the original message or picture being sent by the server cannot be retrieved with only half the packets. so it will show up as an error.

thus the final answer is d.

(a) oldest

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