Cryptography. Methods of Encryption Transposition Switching the symbols within the plaintext Substitution Substituting different symbols for the symbols.

Slides:

Advertisements

Similar presentations

CLASSICAL ENCRYPTION TECHNIQUES

Advertisements

Using Cryptography to Secure Information. Overview Introduction to Cryptography Using Symmetric Encryption Using Hash Functions Using Public Key Encryption.

CAP Cryptographic Analysis Program

Cryptology Terminology and Early History. Cryptology Terms Cryptology –The science of concealing the meaning of messages and the discovery of the meaning.

Creating Secret Messages. 2 Why do we need to keep things secret? Historically, secret messages were used in wars and battles For example, the Enigma.

CC3.12 Erdal KOSE Privacy & Digital Security Encryption.

Classic Cryptography: Caesar Wenyuan Xu Department of Computer Science and Engineering University of South Carolina 2008.

CPSC CPSC 3730 Cryptography Chapter 2 Classical Encryption Techniques.

 8 groups of 2  5 rounds  Basic Definitions  Substitution Cryptosystems  Math  Tricky Questions  Comparing Cryptosystems  10 questions per round.

Chapter 2 – Classical Encryption Techniques

1 Introduction to Codes, Ciphers, and Cryptography Michael A. Karls Ball State University.

Introduction to Cryptography

3.1 SERVICES AND MECHANISMS SERVICES AND MECHANISMS The International Telecommunication Union- Telecommunication Standardization Section (ITU-T) provides.

Cryptography & Cryptanalysis

A Technical Seminar Presentation CLASSICAL CRYPTOGRAPHY

Confusion and Diffusion1 Ref: William Stallings, Cryptography and Network Security, 3rd Edition, Prentice Hall, 2003.

MAT 1000 Mathematics in Today's World Winter 2015.

a connection between language and mathematics

Crypto Laboratory Winter Alexander Grechin and Zohar Rogel Under supervision of Zvika Berkovich.

Systems of Equations as Matrices and Hill Cipher.

Cryptography Data communications and networks Momina Tariq: Ambreen Sohail: Data Communications and Networks.

Day 18. Concepts Plaintext: the original message Ciphertext: the transformed message Encryption: transformation of plaintext into ciphertext Decryption:

McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Security PART VII.

1 Chapter 2-1 Conventional Encryption Message Confidentiality.

Symmetric-Key Cryptography

Introduction to cryptography by konrad. Introduction to cryptography Cryptography is the process of encrypting/decrypting data streams using some E(M)/D(M)

An Introduction to Cryptography. What is cryptography? noun \krip- ˈ tä-grə-fē\ : the process of writing or reading secret messages or codes “Encryption”:

THE SCIENCE, MATHEMATICS, AND ART OF PRIVACY BASIC STUFF 1 CRYPTOGRAPHY.

Python Programming in Context Chapter 3. Objectives To introduce the string data type To demonstrate the use of string methods and operators To introduce.

McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Security.

Traditional Symmetric-Key Ciphers

Web Tools for Classical Cryptology Tristan Beeble.

CRYPTOGRAPHY. TOPICS OF SEMINAR Introduction & Related Terms Categories and Aspects of cryptography Model of Network Security Encryption Techniques Public.

24-Nov-15Security Cryptography Cryptography is the science and art of transforming messages to make them secure and immune to attacks. It involves plaintext,

Computer Science and Engineering Computer System Security CSE 5339/7339 Lecture 3 August 26, 2004.

McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Security PART VII.

MAT 1000 Mathematics in Today's World Winter 2015.

Encryption CS110: Computer Science and the Internet.

Introduction to Cryptology Fall Definitions Digital encryption techniques are used to protect data in two ways: to maintain privacy and to prove.

CS 483 – SD SECTION BY DR. DANIYAL ALGHAZZAWI (2) Information Security.

Symmetric Cipher Model Plaintext input 1- encryption algorithm 2- secret key Encryption Cipher text output Cipher text input 1- Decryption algorithm 2-

Mekanisme security & Crytography. Cryptography ≠Security Cryptography may be a component of a secure system Adding cryptography may not make.

Vigenére Cipher Kimberly Chiffens & Maria Jannelli.

Introduction to Cryptology Fall Definitions Digital encryption techniques are used to protect data in two ways: to maintain privacy and to prove.

Introduction to Cryptography Lecture 4. Caesar Cipher Gaius Julius Caesar (100 B.C.- 44 B.C.) General Politician Dictator of Rome Creator of Caesar Cipher.

Encryption. LEARNING OBJECTIVES: BY THE END OF THE LESSON YOU SHOULD KNOW. What encryption is and why it is important The basics of encryption techniques.

1 Introduction CS 303 Algorithmic Number Theory and Cryptography Jeremy R. Johnson.

Substitution Ciphers Reference –Matt Bishop, Computer Security, Addison Wesley, 2003.

Transposition Cipher Edilasio Pereira Steven Pascal Louis Szgalsky Kimberly Chiffens.

1 Introduction to Cryptography Chapter-4. Definitions  Cryptography = the science (art) of encryption  Cryptanalysis = the science (art) of breaking.

Practical Questions Theoretical Questions

Columnar Transposition

Prepared by: Sameer Ali Aljaroodi, Tutor: Mr. Ahmad Kananh

CAP Cryptographic Analysis Program

Computer and Data Security 4th Class

Topics discussed in this section: 30-2 SYMMETRIC-KEY CRYPTOGRAPHY Symmetric-key cryptography started thousands of years ago when people needed.

Chapter 30 Cryptography Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.

Outline Some Basic Terminology Symmetric Encryption

Cryptography Survey.

Chapter 3:Cryptography (16M)

Transposition Ciphers

NET 311D Information Security

Cryptography Survey.

برگرفته از اسلایدهای © University of Glamorgan

Fun with Cryptography The Science of Secrecy.

Cryptography: Cesar Cipher

Introduction to Cryptography I

Double Transpositions

Computer Security Chapter Two

Symmetric Encryption or conventional / private-key / single-key

Presentation transcript:

Cryptography

Methods of Encryption Transposition Switching the symbols within the plaintext Substitution Substituting different symbols for the symbols in the plaintext

Transposition Rail fence cipher: one if by land two if by sea - plaintext o e f y a d w i b s a n i b l n t o f y e oefyadwibsaniblntofye - ciphertext

Substitution Julius Caesar Cipher Substitute each letter in the plaintext by the letter that is 3 down from it. Encode(letter)=(letter+3) mod 26 Decode(letter)=(letter -3) mod 26

Caesar Cipher example Plaintext: One if by land two if by sea Ciphertext: Rqh li eb odqg wzr li eb vhd

Caesar Cipher Example Decode the following message: vhqg pruh slccd

Caesar Cipher Example Decode the following message: vhqg pruh slccd Answer: send more pizza