tailieunhanh - Lecture Data security and encryption - Lecture 5: Data security and encryption

This chapter presents the following content: Classical cipher techniques and terminology, monoalphabetic substitution ciphers, cryptanalysis using letter frequencies, playfair cipher, polyalphabetic ciphers, transposition ciphers, product ciphers and rotor machines, stenography. | Data Security and Encryption (CSE348) Lecture slides by Lawrie Brown for “Cryptography and Network Security”, 5/e, by William Stallings, briefly reviewing the text outline from Ch 0, and then presenting the content from Chapter 1 – “Introduction”. Lecture # 5 Review have considered: monoalphabetic substitution ciphers cryptanalysis using letter frequencies Playfair cipher Cryptanalysis of Playfair Cipher Polyalphabetic Ciphers Vigenère Cipher Aids Implementing polyalphabetic ciphers by hand can be very tedious Various aids were devised to assist the process The "Saint-Cyr Slide" was popularized and named by Jean Kerckhoffs Who published a famous early text "La Cryptographie Militaire" (Miltary Cryptography) in 1883 Implementing polyalphabetic ciphers by hand can be very tedious. Various aids were devised to assist the process. The "Saint-Cyr Slide" was popularised and named by Jean Kerckhoffs, who published a famous early text "La Cryptographie Militaire" (Miltary Cryptography) in 1883. He named the slide after the French National Military Academy where the methods were taught. He also noted that any slide can be expanded into a tableau, or bent round into a cipher disk. The Vigenère Tableau (given in Stallings 4/e as Table ) is a complete set of forward shifted alphabet mappings. Aids He named the slide after the French National Military Academy where the methods were taught He also noted that any slide can be expanded into a tableau, or bent round into a cipher disk The Vigenère Tableau is a complete set of forward shifted alphabet mappings Implementing polyalphabetic ciphers by hand can be very tedious. Various aids were devised to assist the process. The "Saint-Cyr Slide" was popularised and named by Jean Kerckhoffs, who published a famous early text "La Cryptographie Militaire" (Miltary Cryptography) in 1883. He named the slide after the French National Military Academy where the methods were taught. He also noted . | Data Security and Encryption (CSE348) Lecture slides by Lawrie Brown for “Cryptography and Network Security”, 5/e, by William Stallings, briefly reviewing the text outline from Ch 0, and then presenting the content from Chapter 1 – “Introduction”. Lecture # 5 Review have considered: monoalphabetic substitution ciphers cryptanalysis using letter frequencies Playfair cipher Cryptanalysis of Playfair Cipher Polyalphabetic Ciphers Vigenère Cipher Aids Implementing polyalphabetic ciphers by hand can be very tedious Various aids were devised to assist the process The "Saint-Cyr Slide" was popularized and named by Jean Kerckhoffs Who published a famous early text "La Cryptographie Militaire" (Miltary Cryptography) in 1883 Implementing polyalphabetic ciphers by hand can be very tedious. Various aids were devised to assist the process. The "Saint-Cyr Slide" was popularised and named by Jean Kerckhoffs, who published a famous early text "La Cryptographie .