'Chosen plaintext' presentation slideshows

Cryptanalysis

Cryptanalysis. Khaled Kamal Ragia Al Bassyouni. Cryptanalysis. Definition

1.13k views • 83 slides

CMEA

CMEA. CMEA. C ellular M essage E ncryption A lgorithm Designed for use with cell phones To protect confidentiality of called number For “control channel”, not the “data channel” Data channel encrypted with ORYX Part of a standard developed by TIA Flaw in cipher discovered in 1997

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History and Background

History and Background. CSIS 5857: Encoding and Encryption. Why is History Important?. Most modern encryption algorithms based on concepts hundreds/thousands of years old Monoalphabetic substitution Polyalphabetic substitution Transposition Most attacks on encryption also very old

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ITNS and CERIAS CISSP Luncheon Series: Cryptography

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ITNS and CERIAS CISSP Luncheon Series: Cryptography

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An Expansion Algorithm for Higher Order Differential cryptanalysis of Secret Key Ciphers

An Expansion Algorithm for Higher Order Differential cryptanalysis of Secret Key Ciphers. Manish Mohan ME(CS) ID-2005H103423. Introduction. A model attack on modified MISTY1 by two -round elimination attack as an expansion of higher order differential cryptanalysis.

504 views • 31 slides

Cryptography

Cryptography. Lynn Ackler Southern Oregon University. Information Assurance. Keep information in a known and trusted state that can be used appropriately. NSA Information Security Model. Information States. Transmission. Storage. Processing. Security Measures. Training. Confidentiality.

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Cryptography CS 555

Cryptography CS 555. Topic 10: Block Cipher Security & AES. Outline and Readings. Outline Attacks against block ciphers Differential cryptanalysis Linear cryptanalysis Double & triple encryption AES Readings: Katz and Lindell: 5.4, 5.5, 5.6. Block Cipher Security. Two attack objectives

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Lecture IV : Secret Key Cryptography

Lecture IV : Secret Key Cryptography. Internet Security : Principles & Practices John K. Zao, PhD SMIEEE National Chiao-Tung University Fall 200 5. Outline. Basic Concepts Cyptanalytic Attacks Information-theoretic vs. Computational-difficult Cryptography Block vs. Stream Ciphers

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Cryptography CS 555

Cryptography CS 555. Topic 10: Block Cipher Security & AES. Outline and Readings. Outline Attacks against block ciphers Differential cryptanalysis Linear cryptanalysis Double & triple encryption AES Readings: Katz and Lindell: 5.4, 5.5, 5.6. Block Cipher Security. Two attack objectives

398 views • 26 slides

IT 221: Introduction to Information Security Principles

IT 221: Introduction to Information Security Principles. Lecture 4: Public-Key Cryptography For Educational Purposes Only Revised: September 15, 2002. Context and Questions. Context:

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A Cryptanalytic Time-Memory Trade-off

Lee Jae-song. A Cryptanalytic Time-Memory Trade-off. Introduction. How to cryptanalysis DES? C = E K (P) E is DES encryption funtion K is a key, 56-bit. P is a plaintext, C is a ciphertext, both 64-bit Chosen-plaintext attack:

398 views • 19 slides

Cryptography

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CMSC 414 Computer and Network Security Lecture 4

CMSC 414 Computer and Network Security Lecture 4. Jonathan Katz. Announcements. HW1 out Work in teams of two students Both students should contribute to all problems Material covered on HW1 is fair game for the exam Post on Piazza if you are looking for a partner

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CMSC 414 Computer (and Network) Security Lecture 4

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Cryptology and Its Applications Presented By AKSHAT MATHUR Roll # EC200118042

Cryptology and Its Applications Presented By AKSHAT MATHUR Roll # EC200118042 Under the guidance of Dr. Parth S. Mallick. Introduction. The science of cryptology is the science of secure communications, formed from the Greek

286 views • 14 slides

Announcements: Subscribe to piazza and start HW1 Questions? Roll Call Today: affine ciphers

DTTF/NB479: Dszquphsbqiz Day 2. Announcements: Subscribe to piazza and start HW1 Questions? Roll Call Today: affine ciphers. Sherlock Holmes, The Adventure of the Dancing Men (1898) Who got it?. In a letter:. 2 weeks later:. 2 mornings later:. 3 days later:. 4 days later:.

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Security

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CMSC 414 Computer and Network Security Lecture 4

CMSC 414 Computer and Network Security Lecture 4. Jonathan Katz. One-time pad. The one-time pad achieves perfect secrecy But, it has a number of drawbacks Key size equal to message size Can only be used once Insecure under chosen-plaintext attack

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Which of these does not belong in a security policy? A: data sensitivity definitions

Which of these does not belong in a security policy? A: data sensitivity definitions B: rules about USB key usage C: brand of anti-virus software D: background check requirements for hiring. Is using a weak password a threat or a vulnerability? A: threat B: vulnerability.

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