MMT1-Lec13 - Computer Networks 1 (Mng My Tnh 1) Lectured...

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1 Computer Networks 1 (Mạng Máy Tính 1) Lectured by: Nguyễn Đức Thái
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2 Lecture 13: Network Security Reference : Chapter 8 - “ Computer Networks ”, Andrew S. Tanenbaum, 4th Edition, Prentice Hall, 2003.
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3 Outline Cryptography Introduction Symmetric-key algorithms Public-key algorithms Digital Signatures Management of Public Keys Apply to Computer Networks Terms: Authentication, Authorization, Message Protection Secure Sockets Layer (SSL) E-mail security Web Security
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4 Outline Cryptography Introduction Symmetric-key algorithms Public-key algorithms Digital Signatures Management of Public Keys
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5 Crytography(1) Introduction Cryptography referred almost exclusively to encryption , the process of converting ordinary information (plaintext) into unintelligible gibberish ( ciphertext )
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6 Crytography (2) Symmetric-key algorithms Encryption and decryption functions that use the same key are called symmetric In this case everyone wanting to read encrypted data must share the same key DES is an example of symmetric-key algorithms Encrypt Decrypt
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Crytography (3) Data Encryption Standard (a) General outline. (b) Detail of one iteration.
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MMT1-Lec13 - Computer Networks 1 (Mng My Tnh 1) Lectured...

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