What is the BEST method for securing credit card numbers stored temporarily on a file server prior to transmission to the downstream system for payment processing?
Vote for B. – based on the case study in the ISACA Manual 27th ed: § 3.8.1 – “… forwards all sales data over a frame relay network to database servers located at the retailer’s corporate headquarters, with strong encryption applied to the data, which are then sent over a virtual private network (VPN) to the credit card processor for approval of the sale….”
i vote for B. If masking is being used here, how the data is processed by payment system. Once the data is masked, you cannot retrieve the original data hence the payment system cannot use this data.
Therefore, i vote for encryption here.
hash is not reversible, so you can only check the hash again another hash coming from the same "data", sending the hash over would be useless if the information of the credit card is not already with the other party.
Answer should be B as encryption is the best protection
upvoted 3 times
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