Each output feedback block cipher operation depends on all previous ones, and so cannot be performed in parallel. However, because the plaintext or ciphertext is only used for the final XOR, the block cipher operations may be performed in advance, allowing the final step to be performed in parallel once the plaintext or ciphertext is available.
Each output feedback block c.ipher operation depends on all previous ones, and so cannot be performed in parallel. However, b,ecause the plaintext or ciphertext is only used for the final XOR the block cipher operations may be performed in advance, allowing the final step to be performed in parallel once the plaintext or ciphertext is available