A bank wants to store the account number of its customers (8-digit number) in an encrypted...

 

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

Answer rating: 100% (QA)

A Storing a cryptographic hash of the account number This method of storing a cryptographic hash of the account number can provide a level of security ... View the full answer