Uploaded by perdy

83 SLIDES

846 VUES

830LIKES

Week 4: Block Ciphers and Applications

DESCRIPTION

Explore the vulnerability of DES due to its small 56-bit key size. Learn about historical events, such as Diffie and Helman's work in 1977 and RSA's contest in 1997. Discover how EFF's Deep Crack broke DES cryptography in just 56 hours. Additionally, uncover other encryption examples, including Triple DES, Blowfish, Base 64, and their applications in ATMs and password security.

Week 4: Block Ciphers and Applications

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

Brief Overview of Cryptography

Brief Overview of Cryptography. Outline. cryptographic primitives symmetric key ciphers block ciphers stream ciphers asymmetric key ciphers cryptographic hash functions protocol primitives block cipher operation modes “enveloping” message authentication codes digital signatures

718 views • 48 slides

Chapter 3

Chapter 3. Block Ciphers &amp; The Data Encryption Standard. Contents. Block Cipher Principles The Data Encryption Standard The Strength of DES Differential and Linear Cryptananlysis Block Cipher Design Principles. Block Cipher principles. Stream Ciphers and Block Ciphers

1.34k views • 57 slides

Block Cipher Modes of Operation and Stream Ciphers

Block Cipher Modes of Operation and Stream Ciphers. CSE 651: Introduction to Network Security. Abstract. We will discuss How to use block ciphers? RC4: a widely used stream cipher Problems with WEP’s use of RC4. Modes of Operations. How to use a block cipher?.

821 views • 37 slides

Encrypting with Block Ciphers

Encrypting with Block Ciphers. CS 470 Introduction to Applied Cryptography Instructor: Ali Aydin Selcuk. How to Encrypt with a Block Cipher?. Electronic Codebook (ECB) Mode: The naive way.

257 views • 9 slides

Block Ciphers Lucifer &amp; DES

Block Ciphers Lucifer &amp; DES. CS 470 Introduction to Applied Cryptography Instructor: Ali Aydin Selcuk. . . . . S. S. S. S. S. S. S. S. S. P. . . . . . . . . . P. Block Ciphers &amp; S-P Networks. Block Ciphers: Substitution ciphers with large block size (≥ 64 bits)

394 views • 8 slides

Conventional Cryptography (Symmetric Ciphers)

Conventional Cryptography (Symmetric Ciphers). Outline. Stream Ciphers and Block Ciphers Confusion and Diffusion DES (Data Encryption Standard) Exhaustive Key Search Triple DES, DESX AES (Advanced Encryption Standard) Operation Modes. Symmetric Encryption.

624 views • 41 slides

On Compression of Data Encrypted with Block Ciphers

On Compression of Data Encrypted with Block Ciphers. Demijan Klinc * Carmit Hazay † Ashish Jagmohan ** Hugo Krawczyk ** Tal Rabin ** * Georgia Institute of Technology ** IBM T.J. Watson Research Labs † Weizmann Institute and IDC. Traditional Model.

622 views • 46 slides

The data encryption standard (DES)

Online Cryptography Course Dan Boneh. Block ciphers. The data encryption standard (DES). Block ciphers: crypto work horse. n bits. n bits. E, D. PT Block. CT Block. Key. k Bits. Canonical examples: 3DES: n= 64 bits, k = 168 bits

624 views • 16 slides

Introduction

Introduction. In this type of attack which is applicable both to stream ciphers and block ciphers, ciphers are rewritten to systems of multivariate equations Solving the system of equations will give unknown Thus in short An algebraic attack consists of these two steps:

475 views • 32 slides

Announcements: Matlab tutorial linked to in syllabus Questions? Today:

DTTF/NB479: Dszquphsbqiz Day 7. Announcements: Matlab tutorial linked to in syllabus Questions? Today: Block ciphers , especially Hill Ciphers Modular matrix inverses. 1. Block Ciphers. So far, changing 1 character in the plaintext changes ___ character(s) in the ciphertext .

180 views • 6 slides

Block ciphers 1

Block ciphers 1. Session 3. Contents. Design of block ciphers Non-linear transformations. Design of block ciphers. The problem of block cipher design:

446 views • 25 slides

Ch 3: Block Ciphers and the Data Encryption Standard

Information and Network Security. Ch 3: Block Ciphers and the Data Encryption Standard. Modern Block Ciphers. will now look at modern block ciphers one of the most widely used types of cryptographic algorithms provide secrecy and/or authentication services

587 views • 39 slides

Stream Ciphers and Block Ciphers

Stream Ciphers and Block Ciphers. A stream cipher is one that encrypts a digital data stream one bit or one byte at a time. Examples of classical stream ciphers are the auto keyed Vigenère cipher and the Vernam cipher.

571 views • 13 slides

On Provable Security of Block Ciphers

On Provable Security of Block Ciphers. Kouichi SAKURAI. def. f. can not be distinguished from truly Random. f ： Pseudo-Random. Poly. Timing Machine. ・ Truly Random :. ・ Pseudo-Random Generator Poly. size. '80. ・ Factoring Blim-Micals

381 views • 16 slides

Beyond-birthday-bound Security Based on Tweakable Block Ciphers

Beyond-birthday-bound Security Based on Tweakable Block Ciphers. Kazuhiko Minematsu NEC Corporation. Fast Software Encryption 2009, Leuven, Belgium. Doubling the Block Length of a Cipher. Build 2n-bit block cipher using n-bit components Many solutions, e.g., using Feistel Permutation.

452 views • 28 slides

Data Encryption Standard (DES)

INCS 741: Cryptography. Data Encryption Standard (DES). Dr. Monther Aldwairi New York Institute of Technology- Amman Campus 10/18/2010. Block Ciphers. Block Ciphers. Stream ciphers process messages a bit or byte at a time when en/decrypting Vigenère Cipher Caeser Cipher

1.21k views • 70 slides

Block ciphers 2

Block ciphers 2. Session 4. Contents. Linear cryptanalysis Differential cryptanalysis. Linear cryptanalysis. Known plaintext attack The cryptanalyst has a set of plaintexts and the corresponding ciphertexts

769 views • 48 slides

Beyond-birthday-bound Security Based on Tweakable Block Ciphers

393 views • 28 slides

Ciphers

Ciphers. Mechanism that decides the process of encryption/decryption Stream Cipher: Bit-by-bit encryption / decryption Block Cipher: Block-by-block encryption / decryption. Algorithm Types. Block Ciphers. Stream Ciphers. Types of Cipher. Fig 3.1. Basic operations upon string of 0/1.

797 views • 48 slides

CS457 – Introduction to Information Systems Security Cryptography 1a

CS457 – Introduction to Information Systems Security Cryptography 1a. Elias Athanasopoulos elathan@ics.forth.gr. Cryptography Elements. Symmetric Encryption Block Ciphers Stream Ciphers Asymmetric Encryption Cryptographic Hash Functions Applications.

558 views • 39 slides

Block Ciphers: Workhorses of Cryptography

COMP 1631 Fall 2006. Block Ciphers: Workhorses of Cryptography. insecure channel. Alice. Bob. Attacker. Basic Scenario. Two communicating parties:. Information Security Services. Communicating parties may require:.

210 views • 14 slides

Cryptography: Block Ciphers

Cryptography: Block Ciphers. David Brumely Carnegie Mellon University. Credits: Slides originally designed by David Brumley . Many other slides are from Dan Boneh’s June 2012 Coursera crypto class. What is a block cipher?. Block ciphers are the crypto work horse Canonical examples:

920 views • 57 slides

More Related

Week 4: Block Ciphers and Applications