What would be the the worst case if you implement the following scenario for a credit card transaction:
- Store the private keys as disk files and place them in an area on a server that is readable from a DLL that contains the decryption algorithm -Hardcode one password into a DLL and the other password will be supplied by the service that requests the decryption. This password is then SHA1 hashed with a passphrase -- the result is used to decrypt the private key. After the successful credit card transaction, certain credit card details are then encrypted and stored within the database.
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