| 摘要 |
<p>An output feedback-type (OFB-type) block cipher system generates a cryptographically strong pseudo noise sequence (PN sequence) by providing a feedback loop from an intermediate part of the block cipher to the input section of the system. The feedback loop provides partially encrypted data from within the block cipher back to the input section. In the case of the block cipher system having a round structure with a number of round functions, the feedback loop is connected to a round at an intermediate point of the block cipher system.</p> |
