KHO THƯ VIỆN 🔎

gcm spec chế độ truy cập

➤  Gửi thông báo lỗi    ⚠️ Báo cáo tài liệu vi phạm

Loại tài liệu:     PDF
Số trang:         43 Trang
Tài liệu:           ✅  ĐÃ ĐƯỢC PHÊ DUYỆT
 













Nội dung chi tiết: gcm spec chế độ truy cập

gcm spec chế độ truy cập

The Galois/Counter Mode of Operation (GCM)David A. McGrew Cisco Systems, Inc.170 West Tasman Drive San Jose, c A 95032 mcgrew^cisco.comJohn Viega Secu

gcm spec chế độ truy cậpure Software4100 Lafayette Center Drive, Suite 100 Chantilly, VA 20151 viegaQsecuresoftware.comContents1Introduction12Definition22.1Inputs and Outputs

.......................................................... 22.2Notation.................................................................... 32.3Encryp gcm spec chế độ truy cập

tion.................................................................. 42.4Decryption.................................................................

gcm spec chế độ truy cập

. 72.5Multiplication in67'’(2128)................................................ 73The Field (7F(2128)84Implementation104.1Software..................

The Galois/Counter Mode of Operation (GCM)David A. McGrew Cisco Systems, Inc.170 West Tasman Drive San Jose, c A 95032 mcgrew^cisco.comJohn Viega Secu

gcm spec chế độ truy cậperties and Rationale167Security22AGCM for 64-bit block ciphers25BAES Test Vectors27GCM1 IntroductionGalois/Counter Mode (GCM) is a block cipher mode o

f operation that uses universal hashing over a binary Galois field to provide authenticated encryption. It can be implemented in hardware to achieve h gcm spec chế độ truy cập

igh speeds with low cost and low latency. Software implementations can achieve excellent performance by using table-driven field operations. It uses m

gcm spec chế độ truy cập

echanisms that are supported by a well-understood theoretical foundation, and its security follows from a single reasonable assumption about the secur

The Galois/Counter Mode of Operation (GCM)David A. McGrew Cisco Systems, Inc.170 West Tasman Drive San Jose, c A 95032 mcgrew^cisco.comJohn Viega Secu

gcm spec chế độ truy cậpits per second and above in hardware, perform well in software, and is free of intellectual property restrictions, rhe mode must admit pipelined and p

aralellized implementations and have minimal computational latency in order to be useful at high data rates. Counter mode has emerged as the best meth gcm spec chế độ truy cập

od for high-speed encryption, because it meets those requirements. I lowever, there is no suitable standard message authentication algorithm. This fac

gcm spec chế độ truy cập

t leaves US in the situation in which we can encrypt at high speed, but we cannot provide message authentication that can keep up with our cipher. Thi

The Galois/Counter Mode of Operation (GCM)David A. McGrew Cisco Systems, Inc.170 West Tasman Drive San Jose, c A 95032 mcgrew^cisco.comJohn Viega Secu

gcm spec chế độ truy cậpode meets the same criteria. CBC-MAC |1, /\p-pendix FJ and the modes that use it to provide authentication, such as CCM |2|, EAX Ị3|, and OMAC [41, ca

nnot be pipelined or parallelized, and thus are unsuitable for high data rates. OCB |5J is covered by multiple intellectual property claims, ewe |6] d gcm spec chế độ truy cập

oes not share those problems, but is less appropriate for high speed implementations. In particular, CWC's message authentication component uses 127-b

gcm spec chế độ truy cập

it integer multiplication operations whose implementation costs exceed those of even AES counter mode at high speeds, and it has a circuit depth that

The Galois/Counter Mode of Operation (GCM)David A. McGrew Cisco Systems, Inc.170 West Tasman Drive San Jose, c A 95032 mcgrew^cisco.comJohn Viega Secu

gcm spec chế độ truy cậpst of counter mode at high speeds.GCM also has additional useful properties. It is capable of acting as a stand-alone MAC, authenticating messages whe

n there is no data to encrypt, with no modifications. Importantly, it can be used as an incremental MAC [7]: if an authentication tag is computed for gcm spec chế độ truy cập

a message, then part of the message is changed, an authentication tag can be computed for the new message with computational cost proportional to the

gcm spec chế độ truy cập

number of bits that were changed. This feature is unique among all of the proposed modes.Another useful property is that it accepts initialization vec

The Galois/Counter Mode of Operation (GCM)David A. McGrew Cisco Systems, Inc.170 West Tasman Drive San Jose, c A 95032 mcgrew^cisco.comJohn Viega Secu

gcm spec chế độ truy cậpicated encryption is needed, there is a data element that could be used as a nonce, or as a part of a nonce, except that the length of the elements) m

ay exceed the block size of the cipher. In GCM, a nonce of any size can be used as the IV. This property is shared with EAX, but no otherIGCMproposed gcm spec chế độ truy cập

mode.This document is organized as follows. Section 2 contains a complete specification of GCM, and is the only normative part of this document. Secti

gcm spec chế độ truy cập

on 3 contains an overview of finite fields and a detailed description of the field representation used in GCM. Implementation strategies are described

The Galois/Counter Mode of Operation (GCM)David A. McGrew Cisco Systems, Inc.170 West Tasman Drive San Jose, c A 95032 mcgrew^cisco.comJohn Viega Secu

gcm spec chế độ truy cập, along with a detailed performance comparison with other modes. The security analysis is summarized in Section 7. Appendix A describes the use of GCM

for 64-bit block ciphers. Test data that can be used for validating AES GCM implementations is contained in Appendix B.2 DefinitionThis section conta gcm spec chế độ truy cập

ins the complete definition of GCM for 128-bit block ciphers, The mode is slightly different when applied to 64-bit block ciphers; those differences a

gcm spec chế độ truy cập

re outlined in Appendix A.

The Galois/Counter Mode of Operation (GCM)David A. McGrew Cisco Systems, Inc.170 West Tasman Drive San Jose, c A 95032 mcgrew^cisco.comJohn Viega Secu

The Galois/Counter Mode of Operation (GCM)David A. McGrew Cisco Systems, Inc.170 West Tasman Drive San Jose, c A 95032 mcgrew^cisco.comJohn Viega Secu

Gọi ngay
Chat zalo
Facebook