tailieunhanh - Handbook of Applied Cryptography - chap7

mật mã khối đối xứng chính là những yếu tố nổi bật và quan trọng nhất trong nhiều mật mã hệ thống. Cá nhân, họ cung cấp bảo mật. Như một tòa nhà cơ bản block, tính linh hoạt của họ cho phép xây dựng máy phát điện pseudorandom số, thuật toán mã hóa dòng, Mac, và các hàm băm. Họ hơn nữa có thể phục vụ như một thành phần trung tâm trong tin kỹ thuật xác thực, tính toàn vẹn dữ liệu các cơ chế, tổ chức chứng thực các giao thức, và (đối xứng-key) đề án chữ ký số. Chương này xem. | This is a Chapter from the Handbook of Applied Cryptography by A. Menezes P. van Oorschot and S. Vanstone CRC Press 1996. For further information see hac CRC Press has granted the following specihc permissions for the electronic version of this book Permission is granted to retrieve print and store a single copy of this chapter for personal use. This permission does not extend to binding multiple chapters of the book photocopying or producing copies for other than personal use of the person creating the copy or making electronic copies available for retrieval by others without prior permission in writing from CRC Press. Except where over-ridden by the specihc permission above the standard copyright notice from CRC Press applies to this electronic version Neither this book nor any part may be reproduced or transmitted in any form or by any means electronic or mechanical including photocopying microhlming and recording or by any information storage or retrieval system without prior permission in writing from the publisher. The consent of CRC Press does not extend to copying for general distribution for promotion for creating new works or for resale. Specihc permission must be obtained in writing from CRC Press for such copying. @1997 by CRC Press Inc. Chapter Block Ciphers Contents in Brief Introduction and Background and general Classical ciphers and historical SAFER RC5 and other block Notes and further Introduction and overview Symmetric-key block ciphers are the most prominent and important elements in many cryptographic systems. Individually they provide confidentiality. As a fundamental building block their versatility allows construction of pseudorandom number generators stream ciphers MACs and hash functions. They may furthermore serve as a central component in message authentication techniques data .