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Lecture Data security and encryption - Lecture 15: Public Key Cryptography

The development of public-key cryptography is the greatest and perhaps the only true revolution in the entire history of cryptography. From its earliest beginnings to modern times, virtually all cryptographic systems have been based on the elementary tools of substitution and permutation, and can be classed as private/secret/single key (symmetric) systems. All classical, and modern block and stream ciphers are of this form. | 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 # 15 Review Pseudorandom number generation True random numbers Stream ciphers RC4 Chapter 7 summary. Chapter 9 – Public Key Cryptography and RSA Opening quote. Every Egyptian received two names, which were known respectively as the true name and the good name, or the great name and the little name; and while the good or little name was made public, the true or great name appears to have been carefully concealed. —The Golden Bough, Sir James George Frazer Opening quote. Private-Key Cryptography The development of public-key cryptography is the greatest Perhaps the only true revolution in the entire history of cryptography From its earliest beginnings to modern times, virtually all cryptographic systems have been based on the elementary tools of substitution and permutation The development of public-key cryptography is the greatest and perhaps the only true revolution in the entire history of cryptography. From its earliest beginnings to modern times, virtually all cryptographic systems have been based on the elementary tools of substitution and permutation, and can be classed as private/secret/single key (symmetric) systems. All classical, and modern block and stream ciphers are of this form. Private-Key Cryptography Can be classed as private/secret/single key (symmetric) systems All classical, and modern block and stream ciphers are of this form The development of public-key cryptography is the greatest and perhaps the only true revolution in the entire history of cryptography. From its earliest beginnings to modern times, virtually all cryptographic systems have been based on the elementary tools of substitution and permutation, and can be classed as . | 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 # 15 Review Pseudorandom number generation True random numbers Stream ciphers RC4 Chapter 7 summary. Chapter 9 – Public Key Cryptography and RSA Opening quote. Every Egyptian received two names, which were known respectively as the true name and the good name, or the great name and the little name; and while the good or little name was made public, the true or great name appears to have been carefully concealed. —The Golden Bough, Sir James George Frazer Opening quote. Private-Key Cryptography The development of public-key cryptography is the greatest Perhaps the only true revolution in the entire history of cryptography From its earliest beginnings to modern times, virtually all .