TAILIEUCHUNG - Lecture Network security: Chapter 16 - Dr. Munam Ali Shah

The topics discussed in this chapter are stream cipher features and characteristics; we will explore RC4, RC5, blowfish and triple DES. After studying this chapter you will be able to present an understanding of the principles for stream and block ciphers, use and understand the different techniques used for stream ciphers. | Network Security Lecture 16 Presented by: Dr. Munam Ali Shah Part 2 (c) Symmetric Key Cryptography Stream Ciphers Summary of the Previous Lecture Discussed AES which was designed by Rijmen and Daemen in Belgium has 128/192/256 bit keys, 128 bit data processes data as block of 4 columns operates on entire data block in every round designed to be: resistant against known attacks speed and code compactness on wide range of platforms design simplicity AES Stages Four stages of AES: (Permutation, Substitution) Substitute Byte : Each byte of the block is replaced by its substitution Shift Rows : 1-byte circular shift is performed Mix columns : each byte of a column is mapped in to a new value. Add round key: The block is XOR with subkey Outlines of today’s lecture Stream Cipher features and characteristics We will explore RC4, RC5, Blowfish and Triple DES Objectives You would be able to present an understanding of the principles for stream and block ciphers. You would be able use and .

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