Which DES mode of operation is best suited for database encryption?

A.
Cipher Block Chaining (CBC) mode

B.
Cycling Redundancy Checking (CRC) mode

C.
Electronic Code Book (ECB) mode

D.
Cipher Feedback (CFB) mode

Explanation:
The DES algorithm in Electronic Codebook (ECB) mode is used for DEK and MIC
encryption when symmetric key management is employed. The character string “DES-ECB” within
an encapsulated PEM header field indicates use of this algorithm/mode combination.
A compliant PEM implementation supporting symmetric key management shall support this
algorithm/mode combination. This mode of DES encryption is the best suited for database
encryption because of its low overhead.
ECB Mode has some weakness, here they are:
1. ECB Mode encrypts a 64-bit block independently of all other 64-bit blocks
2. Given the same key, identical plaintext will encrypt the same way
3. Data compression prior to ECB can help (as with any mode)
4. Fixed block size of 64 bits therefore incomplete block must be padded