'Decryption algorithm' presentation slideshows

A Gentle Introduction to Cryptography

A Gentle Introduction to Cryptography Extended quote from Bruce Schneier's book, Secrets and Lies . Cryptography plays a role in computer security, but buggy computer systems and vulnerable communications are a reality that cryptography has not solved. Quote from Eugene Spafford

1.57k views • 120 slides

Security

Security. Security must consider external environment of the system, and protect the system resources Intruders (crackers) attempt to breach security Threat is potential security violation Attack is attempt to breach security Attack can be accidental or malicious

534 views • 40 slides

Lecture 6 Introduction to Cryptography

Lecture 6 Introduction to Cryptography. --- Foundations of computer security ---. Outline. Why study cryptology basic terms in cryptology classic secret key ciphers modern secret key ciphers DES (Data Encryption Standard) Principle of DES. Why Study cryptology(1). A. B. Intruder.

536 views • 37 slides

ECE454 / 599 Computer and Network Security

ECE454 / 599 Computer and Network Security. Dr. Jinyuan (Stella) Sun Dept. of Electrical Engineering and Computer Science University of Tennessee Fall 2012. Secret Key Cryptography. Modes of operation Stream cipher. Encrypting A Large Message.

540 views • 31 slides

Security

PART VII. Security. Security Topics. Chapters. Chapter 29 Cryptography. Chapter 30 Message Authentication, User Authentication, and Key Management. Chapter 31 Security Protocols in The Internet. Chapter 29. Cryptography.

278 views • 27 slides

Chapter 2

Chapter 2. Conventional Encryption Message Confidentiality. Henric Johnson Blekinge Institute of Technology, Sweden http://www.its.bth.se/staff/hjo/ henric.johnson@bth.se. Outline. Conventional Encryption Principles Conventional Encryption Algorithms Cipher Block Modes of Operation

374 views • 26 slides

Hard Problems

Hard Problems. Some problems are hard to solve. No polynomial time algorithm is known. E.g., NP-hard problems such as machine scheduling, bin packing, 0/1 knapsack. Is this necessarily bad? Data encryption relies on difficult to solve problems. encryption algorithm. message. encryption key.

360 views • 24 slides

Advanced Encryption Standard

Advanced Encryption Standard . This Lecture . Why AES? NIST Criteria for potential candidates The AES Cipher AES Functions and Inverse Functions AES Key Expansion Implementation Aspects AES Security and Strength. Why AES? . Symmetric block cipher, published in 2001

745 views • 16 slides

IV054

q. The most important public-key cryptosystem is the RSA cryptosystem on which one can also illustrate a variety of important ideas of modern public-key cryptography.

254 views • 15 slides

IV054

q. The most important public-key cryptosystem is the RSA cryptosystem on which one can also illustrate a variety of important ideas of modern public-key cryptography.

155 views • 15 slides

????? Caesar Cipher

267 views • 9 slides