data encryption standard des

... = DES( k,m) m = DES( k,c) C = DES( k1,m) m = DES( k2,c)  Mã thám • Visai • Tuyến tính • Davies Bài tập Cho rõ có nội dung sau: “0123456789ABCDEF”  Sử dụng khóa: “133457799BBCDEF1”  Mã hóa DES ... • • Giải Mã DES Sử dụng dãy khóa Thứ tự khóa đảo ngược Thực số vòng lặp  Điểm yếu DES  Tìm khóa vét cạn: Có 2^56 khả  Sử dụng tính bù để loại trừ số khả khóa C = DES( k,m) => C = DES( k , m) ... Mã hóa DES Tin 64- bit Hoán vị đầu Khóa 64 bit IP KS K1 48-bit Vòng K2 48- bit Vòng … Vòng 16 Hoán vị cuối...

Ngày tải lên: 08/08/2014, 07:22

... HỌC CÔNG NGHỆ THÔNG TIN VÀ TRUYỀN THÔNG NGUYỄN THỊ THỦY TÌM HIỂU CHUẨN MẬT MÃ DỮ LIỆU DES (DATA ENCRYPTION STANDARD) VÀ ĐÁNH GIÁ ĐỘ AN TOÀN Chuyên ngành: KHOA HỌC MÁY TÍNH Mã số: 60 48 01 LUẬN ... chung độ mật DES 53 2.3.3 Ƣu điểm hệ mật mã DES 54 2.3.4 Các điểm yếu DES .54 2.3.4.1 Tính bù: 54 2.3.4.2 Khóa yếu .54 2.3.4.3 DES có cấu trúc ... tốt? Hiểu đƣợc tính cấp thiết quan trọng nên chọn đề tài “Tìm hiểu chuẩn mật mã liệu DES (Data Encryption Standard) đánh giá độ an toàn” Luận văn đóng góp phần nhỏ vào việc nhìn nhận đánh giá...

Ngày tải lên: 23/12/2014, 10:45

... toán mã hóa tiếng  DES (Data Encryption Standard)  One-time Pad (OTP)  AES (Advance Encryption Standard)  RSA DES | DES | I.GIỚI THIỆU Thuật toán DES (Data Encryption Standard) thuật toán ... hóa liệu phổ biến là: DES, AES (Advanced Encryption Standard - Tiêu chuẩn mã hóa nâng cao),… Thuật toán mã hóa khối đời sớm có nhiều ảnh hưởng thuật toán DES (Data Encryption Standard - Tiêu chuẩn ... dụng DES chuẩn mã hóa liệu thực giao dịch DES American National Standards Institute(ANSI) chứng nhận chuẩn mã hóa dự liệu giao dịch ngân hàng vào năm 1980 DES | DES | II TỔNG QUAN Giải thuật DES...

Ngày tải lên: 23/05/2015, 10:16

... chọn phải khóa yếu nhỏ 3 Triple DES: Triple -DES DES với hai chìa khoá 56 bit Cho tin cần mã hoá, chìa khoá dùng để mã hoá DES tin Kết thu lại cho qua trình giải mã DES với chìa khoá chìa khoá thứ ... thứ hai Bản tin sau qua biến đổi thuật toán DES hai lần lại mã hoá DES lần với chìa khoá để tin mã hoá cuối Quá trình mã hoá DES ba bước gọi Triple -DES ... đến K1, nghĩa bước trình mã hoá liệu đầu vào Ri-1 XOR với K17-i với Ki Đặc điểm mã DES Tính chất bù mã DES: DES có tính chất bù: : Ā phần bù A theo bít (1 thay ngược lại) EK mã hóa E với khóa...

Ngày tải lên: 30/05/2015, 08:06

... Cataloging-in-Publication Data Curtin, Matt Brute force : Cracking the data encryption standard / Matt Curtin p cm Includes bibliographical references and index ISBN 0-387-20109-2 (alk paper) Computer security Data encryption ... Data Encryption Standard 21 tional Standards Organization (ISO) adopted the algorithm, calling it DEA-1 Australia’s banking standard also was built around DES Given the widespread adoption of DES ... same Data Encryption Standard produced by the NBS effort In view of this activity, the American Bankers Association developed its own (voluntary) standard around the DES algorithm The Interna- Data...

Ngày tải lên: 25/03/2014, 11:08

... decrypting the other half-word PIC17C42 IMPLEMENTATION OF DES CPU processing is required to generate the encryption key into the DES subkeys The 64-bit encryption key is reduced to 56-bits, by ignoring ... because of the programmability of the device References NBS FIPS PUB 46, Data Encryption Standard, ” National Bureau of Standards, US Department of Commerce, January 1977 SO DIS 8730, “Banking ... are the most critical step in the DES algorithm and more than anything else give DES its security Li = Ri Ri = Li-1 XOR f(Ri-1, Ki) All the complexity of the DES algorithm lies in the function...

Ngày tải lên: 11/01/2016, 11:52

... center The Three Principles of Data Center Infrastructure Design The Three Principles of Data Center Design When you understand the three principles of data center design, you are able to: • Lower ... transmission within the data center A substandard performing data canter can be just as costly and disruptive to your business as downtime The Three Principles of Data Center Infrastructure Design As networks ... Considerations Standards The TIA-942 Telecommunications Infrastructure Standard for Data Centers was published in 2005 and specifies requirements and guidelines for data center infrastructures The standard...

Ngày tải lên: 10/12/2013, 03:15

... the home page: • The Three Principles of Data Center Infrastructure Design – 102261AE • Designing an Optimized Data Center – 101818AE • TIA-942 Data Center Standards Overview – 102264AE • Building ... know that the cost to build a data center can be upwards of $1,000 per square foot? Clearly, maximizing space resources is a critical aspect of data center design Data center downtime can cost ... reconfigure? Then you need to strategically design your data center from the very beginning Stick to the following three principles of data center design, and you can’t go wrong Space Savings...

Ngày tải lên: 10/12/2013, 19:15

Ngày tải lên: 10/12/2013, 19:15

... information on data center design, best practices, and standards, download the following ADC white papers at www.adc.com • The Three Principles of Data Center Infrastructure Design – 102261AE • Designing ... know that the cost to build a data center can be upwards of $1,000 per square foot? Clearly, maximizing space resources is a critical aspect of data center design Data center downtime can cost ... reconfigure? Then you need to strategically design your data center from the very beginning Stick to the following three principles of data center design, and you can’t go wrong Space Savings...

Ngày tải lên: 20/12/2013, 22:15

... center The Three Principles of Data Center Infrastructure Design The Three Principles of Data Center Design When you understand the three principles of data center design, you are able to: • Lower ... transmission within the data center A substandard performing data canter can be just as costly and disruptive to your business as downtime The Three Principles of Data Center Infrastructure Design As networks ... Considerations Standards The TIA-942 Telecommunications Infrastructure Standard for Data Centers was published in 2005 and specifies requirements and guidelines for data center infrastructures The standard...

Ngày tải lên: 20/12/2013, 22:15

... k cho khoá s d ng trình -8- Thu t toán DES b c l m t s ñi m y u mà nh ng k l i d ng ñ thám mã 1.6.1.2 Triple DES ( 3DES) Triple DES th t ch t mã hóa theo DES ba l n v i khóa K1, K2, K3 cho m i ... "Nghiên c u gi i thu t Advances Encryption Standard mã hóa văn b n m t t i trư ng Cao ñ ng công k ngh Đông Á" nh m nghiên c u gi i thu t mã hóa ñ i x ng Advanced Encryption Standard - AES ñ ñưa m t ... toán Advanced Encryption Standard công b công khai, rơi vào tay quân ñ ch mà b t kỳ s phi n ph c Chương c " 1.2 Tính ch t c a mã hóa thông tin ng d ng thu t toán Advanced Encryption Standard mã...

Ngày tải lên: 30/12/2013, 13:46

... center The Three Principles of Data Center Infrastructure Design The Three Principles of Data Center Design When you understand the three principles of data center design, you are able to: • Lower ... transmission within the data center A substandard performing data canter can be just as costly and disruptive to your business as downtime The Three Principles of Data Center Infrastructure Design As networks ... Considerations Standards The TIA-942 Telecommunications Infrastructure Standard for Data Centers was published in 2005 and specifies requirements and guidelines for data center infrastructures The standard...

Ngày tải lên: 16/01/2014, 21:20

... information on data center design, best practices, and standards, download the following ADC white papers at www.adc.com • The Three Principles of Data Center Infrastructure Design – 102261AE • Designing ... know that the cost to build a data center can be upwards of $1,000 per square foot? Clearly, maximizing space resources is a critical aspect of data center design Data center downtime can cost ... reconfigure? Then you need to strategically design your data center from the very beginning Stick to the following three principles of data center design, and you can’t go wrong Space Savings...

Ngày tải lên: 24/01/2014, 03:20

... center The Three Principles of Data Center Infrastructure Design The Three Principles of Data Center Design When you understand the three principles of data center design, you are able to: • Lower ... transmission within the data center A substandard performing data canter can be just as costly and disruptive to your business as downtime The Three Principles of Data Center Infrastructure Design As networks ... Considerations Standards The TIA-942 Telecommunications Infrastructure Standard for Data Centers was published in 2005 and specifies requirements and guidelines for data center infrastructures The standard...

Ngày tải lên: 24/01/2014, 03:20

... Documents Cisco Data Center Infrastructure Design Guide 2.1 Release Notes OL-11569-01 iii Contents Cisco Data Center Infrastructure Design Guide 2.1 Release Notes iv OL-11569-01 Cisco Data Center ... modules now dominate all data center-related designs as the need for higher performance and scalability are even more critical today in the data center • Data center design models—The multi-tier ... http://www.cisco.com/en/US/netsol/ns656/networking_solutions_design_guidance0900aecd800 ed146.html Cisco Data Center Infrastructure Design Guide 2.1 Release Notes OL-11569-01 Related Documents Cisco Data Center Infrastructure Design Guide...

Ngày tải lên: 24/01/2014, 10:20

... center The Three Principles of Data Center Infrastructure Design The Three Principles of Data Center Design When you understand the three principles of data center design, you are able to: • Lower ... transmission within the data center A substandard performing data canter can be just as costly and disruptive to your business as downtime The Three Principles of Data Center Infrastructure Design As networks ... Considerations Standards The TIA-942 Telecommunications Infrastructure Standard for Data Centers was published in 2005 and specifies requirements and guidelines for data center infrastructures The standard...

Ngày tải lên: 24/01/2014, 11:20

... 100-235) Name of Standard Advanced Encryption Standard (AES) (FIPS PUB 197) Category of Standard Computer Security Standard, Cryptography Explanation The Advanced Encryption Standard (AES) specifies ... Federal Information Processing Standards Publication 197 November 26, 2001 Announcing the ADVANCED ENCRYPTION STANDARD (AES) Federal Information Processing Standards Publications (FIPS PUBS) ... information in lieu of this standard In addition, this standard may be adopted and used by non-Federal Government organizations Such use is encouraged when it provides the desired security for commercial...

Ngày tải lên: 27/01/2014, 11:20

... outline        2.1 Data Encryption Algorithm Design Criteria 2.2 Data Encryption Standard 2.3 Multiple DES 2.4 Advanced Encryption Standard 2.5 Standard Block-Cipher Modes of Operations 2.6 ... Outline        2.1 Data Encryption Algorithm Design Criteria 2.2 Data Encryption Standard 2.3 Multiple DES 2.4 Advanced Encryption Standard 2.5 Standard Block-Cipher Modes of Operations 2.6 ... roadmap        2.1 Data Encryption Algorithm Design Criteria 2.2 Data Encryption Standard 2.3 Multiple DES 2.4 Advanced Encryption Standard 2.5 Standard Block-Cipher Modes of Operations 2.6...

Ngày tải lên: 17/02/2014, 14:20

... Examples of well-known symmetric key algorithms are Data Encryption Standard (DES) , 3DES (pronounced “triple DEZ”), and Advanced Encryption Standard (AES) Asymmetric Keys Asymmetric cryptography ... Brocade encryption mode of operation for encrypting block data on disk media Advanced Encryption Standard (AES) The Advanced Encryption Standard (AES) was developed by the National Institute of Standards ... Brocade encryption devices generate the actual data encryption key and store it locally in the cache The DEK is used to encrypt data using the AES-256 encryption algorithm Before any data encryption...

Ngày tải lên: 19/03/2014, 13:33