• Bài giảng Cryptography and Netword Security - Chapter 13 Digital SignatureBài giảng Cryptography and Netword Security - Chapter 13 Digital Signature

    Time Stamped Signatures Sometimes a signed document needs to be time stamped to prevent it from being replayed by an adversary. This is called time-stamped digital signature scheme. Blind Signatures Sometimes we have a document that we want to get signed without revealing the contents of the document to the signer.

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  • Bài giảng Cryptography and Netword Security - Chapter 12 Cryptographic Hash FunctionsBài giảng Cryptography and Netword Security - Chapter 12 Cryptographic Hash Functions

    Although Whirlpool has not been extensively studied or tested, it is based on a robust scheme (Miyaguchi-Preneel), and for a compression function uses a cipher that is based on AES, a cryptosystem that has been proved very resistant to attacks. In addition, the size of the message digest is the same as for SHA-512. Therefore it is expected to ...

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  • Bài giảng Cryptography and Netword Security - Chapter 11 Message Integrity and Message AuthenticationBài giảng Cryptography and Netword Security - Chapter 11 Message Integrity and Message Authentication

    A modification detection code (MDC) is a message digest that can prove the integrity of the message: that message has not been changed. If Alice needs to send a message to Bob and be sure that the message will not change during transmission, Alice can create a message digest, MDC, and send both the message and the MDC to Bob. Bob can create a ...

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  • Bài giảng Cryptography and Netword Security - Chapter 10 Symmetric-Key CryptographyBài giảng Cryptography and Netword Security - Chapter 10 Symmetric-Key Cryptography

    1. Bob selects E 67(2, 3) as the elliptic curve over GF(p). 2. Bob selects e 1 = (2, 22) and d = 4. 3. Bob calculates e 2 = (13, 45), where e2 = d ×e1. 4. Bob publicly announces the tuple (E, e1, e2). 5. Alice sends the plaintext P = (24, 26) to Bob. She selects r = 2. 6. Alice finds the point C1=(35, 1), C2=(21, 44). 7. Bob receives C 1,...

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  • Bài giảng Cryptography and Netword Security - Chapter 7 Advanced Encryption Standard (AES)Bài giảng Cryptography and Netword Security - Chapter 7 Advanced Encryption Standard (AES)

    The algorithms used inin AES areare soso simple that they cancan bebe easily implemented using cheap processors and aminimum amount ofof memory.

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  • Bài giảng Cryptography and Netword Security - Chapter 6 Lecture Data Encryption Standard (DES)Bài giảng Cryptography and Netword Security - Chapter 6 Lecture Data Encryption Standard (DES)

    Linear cryptanalysis is newer than differential cryptanalysis. DES is more vulnerable to linear cryptanalysis than to differential cryptanalysis. S-boxes are not very resistant to linear cryptanalysis. It has been shown that DES can be broken using 243 pairs of known plaintexts. However, from the practical point of view, finding so many pairs ...

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  • Bài giảng Cryptography and Netword Security - Chapter 3 Traditional Symmetric-Key CiphersBài giảng Cryptography and Netword Security - Chapter 3 Traditional Symmetric-Key Ciphers

    In practice, blocks of plaintext are encrypted individually, but they use a stream of keys to encrypt the whole message block by block. In other words, the cipher is a block cipher when looking at the individual blocks, but it is a stream cipher when looking at the whole message considering each block as a single unit

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  • Bài giảng Cryptography and Netword Security - Chapter 1 IntroductionBài giảng Cryptography and Netword Security - Chapter 1 Introduction

    The rest ofof this book isis divided into four parts. Part One: Symmetric-Key Enciphermen Part Two: Asymmetric-Key Encipherment Part Three: Integrity, Authentication, and Key Management Part Four: Network Security

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  • Hướng dẫn sử dụng ARCMAPHướng dẫn sử dụng ARCMAP

    - Click Selection, chọn Select by Location. - Trên thanh xổ chọn cách đối tượng được chọn. - Chọn các Layermuốn chọn. - Chọn cách chọn đối tượng. - Trên thanh xổ chọn Layermà muốn sử dụng để chọn đối tượng. - Nếu muốn sử dụng Bufferthì nhập vào khoảng cách. - Click Apply.

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  • Bài giảng Hệ điều hành - Duy PhanBài giảng Hệ điều hành - Duy Phan

     WS loại trừ được tình trạng trì trệ mà vẫn đảm bảo mức độ đa chương  Theo vết các WS? => WS xấp xỉ (đọc thêm trong sách)  Đọc thêm:  Hệ thống tập tin  Hệ thống nhập xuất  Hệ thống phân tán

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