In the ECB mode of encryption if an attacker reorders the blocks of ciphertext then each block will still decrypt successfully, however, the reordering may alter the meaning of the overall data sequence.

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In ECB (Electronic Codebook) mode, each block of plaintext is encrypted independently, so reordering the ciphertext blocks will not prevent each block from being decrypted successfully. However, the reordering will change the sequence of the plaintext blocks, potentially altering the meaning of the overall data.

In the ECB Mode of Encryption If an Attacker Reorders