What are the main advantages and disadvantages of Electronic Codebook (ECB)?
What will be an ideal response?
ECB is straightforward but has an obvious disadvantage. Given that two blocks, B[i] and B[j], are the same, the corresponding ciphertext blocks generated C[i] and C[j] will also be the same. ECB is highly susceptible to dictionary attacks. If the data pattern appears frequently, the attacker can easily detect this pattern and learn something about the plaintext. ECB is almost never recommended, as it is very difficult to use securely. The greatest advantage of ECB is that messages can be encrypted in parallel form since there is no dependence among blocks. However, parallel encryption is also supported in counter mode, as discussed later in the chapter, and is a better alternative than ECB.
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Indicate whether the statement is true or false