Week 4: Block Ciphers and Applications

Dec 14, 2023

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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.

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Week 4: Block Ciphers and Applications

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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

695 views • 48 slides

Chapter 3

Chapter 3. Block Ciphers & 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

1.29k 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?.

799 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.

244 views • 9 slides

Block Ciphers Lucifer & DES

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

372 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.

608 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.

609 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

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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:

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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 .

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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:

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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

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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.

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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

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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.

439 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

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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

735 views • 48 slides

Beyond-birthday-bound Security Based on Tweakable Block Ciphers

380 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.

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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.

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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:.

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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:

881 views • 57 slides

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Week 4: Block Ciphers and Applications

Week 4: Block Ciphers and Applications

Presentation Transcript

Brief Overview of Cryptography

Chapter 3

Block Cipher Modes of Operation and Stream Ciphers

Encrypting with Block Ciphers

Block Ciphers Lucifer &amp; DES

Conventional Cryptography (Symmetric Ciphers)

On Compression of Data Encrypted with Block Ciphers

The data encryption standard (DES)

Introduction

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

Block ciphers 1

Ch 3: Block Ciphers and the Data Encryption Standard

Stream Ciphers and Block Ciphers

On Provable Security of Block Ciphers

Beyond-birthday-bound Security Based on Tweakable Block Ciphers

Data Encryption Standard (DES)

Block ciphers 2

Beyond-birthday-bound Security Based on Tweakable Block Ciphers

Ciphers

CS457 – Introduction to Information Systems Security Cryptography 1a

Block Ciphers: Workhorses of Cryptography

Cryptography: Block Ciphers

Block Ciphers Lucifer & DES