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Encrypt and decrypt data blocks of varying sizes from 0.5 to 20 MB). Experiments performed on ECB and CBC modes. In ECB mode, DES algorithm takes 4 s for a 20-MB data block. In CBC mode, the time taken by the DES algorithm on a 20-MB data block is slightly more than ECB. Due to its key-chaining nature, more processing time is required. The average difference between CBC and EBC is 0.059896 s.

On both ECB and CBC modes, AES algorithm takes approximately 16 s for the same 20-MB block for encryption and decryption.