Western Governors University (WGU) ITAS 2142 D830 Introduction to Cryptography Practice Exam

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In ECB mode, how does a single bit error in the ciphertext affect the decrypted plaintext?

It affects only the corresponding plaintext block

In ECB mode, each block is encrypted and decrypted independently with the same key. A single bit error in one ciphertext block only disrupts the decryption of that specific block. The other blocks are unaffected because they are not linked to it. The corrupted block typically yields a garbled plaintext, but the rest of the message decrypts normally. It does not reveal the key, nor does it cause decryption to fail for the entire message.

It corrupts all plaintext blocks

It reveals the encryption key

It causes decryption to fail for the entire message

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