To encrypt a series of plaintext blocks p1, p2, . . . pn using a block cipherE operating in electronic code book (ECB) mode, each ciphertext blockc1, c2, . . . cn is computed as ci = Ek(pi).Which of the following is not a property of this block cipher mode?a.Noneb.Any repeated plaintext blocks will result in identical corresponding blocksciphertext blocks.c.Decryption can be fully parallelizedd.If a ciphertext block is modified or corrupted, then after decryption thecorresponding plaintext block and all the following plaintext blocks willbe affected.
Question
To encrypt a series of plaintext blocks p1, p2, . . . pn using a block cipherE operating in electronic code book (ECB) mode, each ciphertext blockc1, c2, . . . cn is computed as ci = Ek(pi).Which of the following is not a property of this block cipher mode?a.Noneb.Any repeated plaintext blocks will result in identical corresponding blocksciphertext blocks.c.Decryption can be fully parallelizedd.If a ciphertext block is modified or corrupted, then after decryption thecorresponding plaintext block and all the following plaintext blocks willbe affected.
Solution
The correct answer is d. If a ciphertext block is modified or corrupted, then after decryption the corresponding plaintext block and all the following plaintext blocks will be affected. This is not a property of the Electronic Code Book (ECB) mode of operation in block ciphers. In ECB mode, each plaintext block is encrypted independently of the other blocks. Therefore, if a ciphertext block is modified, only the corresponding decrypted plaintext block will be affected. The following plaintext blocks will not be affected.
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