The document summarizes the Data Encryption Standard (DES) cryptosystem. It describes DES as a symmetric-key block cipher developed from a modified version of the Lucifer cipher and standardized by NIST in 1975. The core of DES is the DES function, which applies a 48-bit key to the rightmost 32 bits of the input block using substitution boxes and permutation tables to produce a 32-bit output in a Feistel network structure, with 16 rounds of processing to diffuse the plaintext over the block.
In cryptography, a block cipher is a deterministic algorithm operating on ... Systems as a means to effectively improve security by combining simple operations such as .... Finally, the cipher should be easily cryptanalyzable, such that it can be ...
Modern block ciphers are widely used to provide encryption of quantities of information, and/or a cryptographic checksum to ensure the contents have not been altered. We continue to use block ciphers because they are comparatively fast, and because we know a fair amount about how to design them.
Information and data security block cipher and the data encryption standard (...Mazin Alwaaly
Information And Data Security Block Cipher and the data encryption standard (DES) seminar
Mustansiriya University
Department of Education
Computer Science
In cryptography, a block cipher is a deterministic algorithm operating on ... Systems as a means to effectively improve security by combining simple operations such as .... Finally, the cipher should be easily cryptanalyzable, such that it can be ...
Modern block ciphers are widely used to provide encryption of quantities of information, and/or a cryptographic checksum to ensure the contents have not been altered. We continue to use block ciphers because they are comparatively fast, and because we know a fair amount about how to design them.
Information and data security block cipher and the data encryption standard (...Mazin Alwaaly
Information And Data Security Block Cipher and the data encryption standard (DES) seminar
Mustansiriya University
Department of Education
Computer Science
This is a Presentation On use of AES Algorithm To Encrypt Or Decrypt a Text File. This Algorithm is the latest and better than DES. It is a Networking Presentation. Thank You.
4. The Advanced Encryption Standard (AES)Sam Bowne
A lecture for a college course -- CNIT 140: Cryptography for Computer Networks at City College San Francisco
Based on "Understanding Cryptography: A Textbook for Students and Practitioners" by Christof Paar, Jan Pelzl, and Bart Preneel, ISBN: 3642041000
Instructor: Sam Bowne
More info: https://samsclass.info/141/141_F17.shtml
Project consists of individual modules of encryption and decryption units. Standard T-DES algorithm is implemented. Presently working on to integrate DES with AES to develop stronger crypto algorithm and test the same against Side Channel Attacks and compare different algorithms.
The presentation covers the following:
Basic Terms
Cryptography
The General Goals of Cryptography
Common Types of Attacks
Substitution Ciphers
Transposition Cipher
Steganography- “Concealed Writing”
Symmetric Secret Key Encryption
Types of Symmetric Algorithms
Common Symmetric Algorithms
Asymmetric Secret Key Encryption
Common Asymmetric Algorithms
Public Key Cryptography
Hashing Techniques
Hashing Algorithms
Digital Signatures
Transport Layer Security
Public key infrastructure (PKI)
This presentation is based on the paper :
"A Method for Obtaining Digital Signatures and Public-Key Cryptosystems" by R.L. Rivest, A. Shamir, and L. Adleman
Slides for a college cryptography course at CCSF. Instructor: Sam Bowne
Based on: Understanding Cryptography: A Textbook for Students and Practitioners by Christof Paar, Jan Pelzl, and Bart Preneel, ISBN: 3642041000 ASIN: B014P9I39Q
See https://samsclass.info/141/141_F17.shtml
The Diffie-Hellman algorithm was developed by Whitfield Diffie and Martin Hellman in 1976.
This algorithm was devices not to encrypt the data but to generate same private cryptographic key at both ends so that there is no need to transfer this key from one communication end to another.
Diffie – Hellman algorithm is an algorithm that allows two parties to get the shared secret key using the communication channel, which is not protected from the interception but is protected from modification.
CS8792 - Cryptography and Network Securityvishnukp34
this is an engineering subject.this consist of
pgno: 5 - Information security in past & present
pgno: 7 - Aim of Course
pgno: 8 - OSI Security Architecture
pgno: 9 - Security Goals – CIA Triad
pgno: 13 - Aspects of Security
pgno: 17 - ATTACKS
pgno: 22 - Passive Versus Active Attacks
pgno: 23 - SERVICES AND MECHANISMS
A brief discussion of network security and an introduction to cryptography. We end the presentation with a discussion of the RSA algorithm, and show how it works with a basic example.
This is a Presentation On use of AES Algorithm To Encrypt Or Decrypt a Text File. This Algorithm is the latest and better than DES. It is a Networking Presentation. Thank You.
4. The Advanced Encryption Standard (AES)Sam Bowne
A lecture for a college course -- CNIT 140: Cryptography for Computer Networks at City College San Francisco
Based on "Understanding Cryptography: A Textbook for Students and Practitioners" by Christof Paar, Jan Pelzl, and Bart Preneel, ISBN: 3642041000
Instructor: Sam Bowne
More info: https://samsclass.info/141/141_F17.shtml
Project consists of individual modules of encryption and decryption units. Standard T-DES algorithm is implemented. Presently working on to integrate DES with AES to develop stronger crypto algorithm and test the same against Side Channel Attacks and compare different algorithms.
The presentation covers the following:
Basic Terms
Cryptography
The General Goals of Cryptography
Common Types of Attacks
Substitution Ciphers
Transposition Cipher
Steganography- “Concealed Writing”
Symmetric Secret Key Encryption
Types of Symmetric Algorithms
Common Symmetric Algorithms
Asymmetric Secret Key Encryption
Common Asymmetric Algorithms
Public Key Cryptography
Hashing Techniques
Hashing Algorithms
Digital Signatures
Transport Layer Security
Public key infrastructure (PKI)
This presentation is based on the paper :
"A Method for Obtaining Digital Signatures and Public-Key Cryptosystems" by R.L. Rivest, A. Shamir, and L. Adleman
Slides for a college cryptography course at CCSF. Instructor: Sam Bowne
Based on: Understanding Cryptography: A Textbook for Students and Practitioners by Christof Paar, Jan Pelzl, and Bart Preneel, ISBN: 3642041000 ASIN: B014P9I39Q
See https://samsclass.info/141/141_F17.shtml
The Diffie-Hellman algorithm was developed by Whitfield Diffie and Martin Hellman in 1976.
This algorithm was devices not to encrypt the data but to generate same private cryptographic key at both ends so that there is no need to transfer this key from one communication end to another.
Diffie – Hellman algorithm is an algorithm that allows two parties to get the shared secret key using the communication channel, which is not protected from the interception but is protected from modification.
CS8792 - Cryptography and Network Securityvishnukp34
this is an engineering subject.this consist of
pgno: 5 - Information security in past & present
pgno: 7 - Aim of Course
pgno: 8 - OSI Security Architecture
pgno: 9 - Security Goals – CIA Triad
pgno: 13 - Aspects of Security
pgno: 17 - ATTACKS
pgno: 22 - Passive Versus Active Attacks
pgno: 23 - SERVICES AND MECHANISMS
A brief discussion of network security and an introduction to cryptography. We end the presentation with a discussion of the RSA algorithm, and show how it works with a basic example.
Performance Analysis of Data Encryption Standard DESijtsrd
Information security is becoming much more important in data storage and transmission with the fast progression of digital data exchange in electronic way. Cryptography has come up as a solution which plays a vital role in information security system against malicious attacks. The cryptography is most important aspect of communications security and becoming an important building block for computer security. This security mechanism uses some algorithms to scramble data into unreadable text which can be only being decoded or decrypted by party those possesses the associated key. To protect sent messages that some of the most commonly used cryptography methods with private key based algorithm are LOKI 89, 91, 97 , DES, triple DES, AES, Blowfish, etc. These algorithms also include several computational issues as well as the analysis of DES algorithm. The main features that specify and differentiate one algorithm from another are the ability to the speed of encryption and decryption of the input plain text. This paper analyzes the private key based algorithm DES and LOKI91 by computing index of coincidence IC and time efficiency. Thida Soe | Soe Soe Mon | Khin Aye Thu "Performance Analysis of Data Encryption Standard (DES)" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-3 | Issue-5 , August 2019, URL: https://www.ijtsrd.com/papers/ijtsrd26650.pdfPaper URL: https://www.ijtsrd.com/computer-science/computer-security/26650/performance-analysis-of-data-encryption-standard-des/thida-soe
Enhancement of DES Algorithm with Multi State LogicIJORCS
The principal goal to design any encryption algorithm must be the security against unauthorized access or attacks. Data Encryption Standard algorithm is a symmetric key algorithm and it is used to secure the data. Enhanced DES algorithm works on increasing the key length or complex S-BOX design or increased the number of states in which the information is to be represented or combination of above criteria. By increasing the key length, the number of combinations for key will increase which is hard for the intruder to do the brute force attack. As the S-BOX design will become the complex there will be a good avalanche effect. As the number of states increases in which the information is represented, it is hard for the intruder to crack the actual information. Proposed algorithm replace the predefined XOR operation applied during the 16 round of the standard algorithm by a new operation called “Hash function” depends on using two keys. One key used in “F” function and another key consists of a combination of 16 states (0,1,2…13,14,15) instead of the ordinary 2 state key (0, 1). This replacement adds a new level of protection strength and more robustness against breaking methods.
Information and network security 20 data encryption standard desVaibhav Khanna
The Data Encryption Standard is a symmetric-key algorithm for the encryption of digital data. Although its short key length of 56 bits makes it too insecure for applications, it has been highly influential in the advancement of cryptography.
Abstract
There is great research going on in the field of data security nowadays. Protecting information from disclosure and breach is of high importance to users personally and to organizations and businesses around the world, as most of information currently are sensitive electronic information transferred over the internet and stored in cloud based system. In this paper, we propose a method to increase the security of messages transferred on the internet, or information stored in the cloud. Our proposed method mainly relies on the Triple Data Encryption Standard (TDES) algorithm. TDES is intact the Data Encryption Standard repeated three times in succession to encrypt data. TDES is considered highly secure as there is no applicable method to break the code itself without knowing the key. We propose to encrypt the key using Cipher Feedback Block algorithm, before using TDES to encrypt data. Such that even when the key is disclosed, the key itself cannot decipher the ciphered text without enciphering the key with CFB. This introduces a new dimension of security to the TDES algorithm.
The method introduced in this paper increases the security of the TDES algorithm using CFB algorithm by increasing the key security, such that it is actually not possible to decipher the text without prior knowledge and agreement of key and algorithms used.
Keywords: Data Encryption Standard, Triple Data Encryption Algorithm, Cipher Feedback Block.
A very clear presentation on Crytographic Alogotithms DES and RSA with basic concepts of cryptography. This presented by students of Techno India, Salt Lake.
International Journal of Engineering Research and Development (IJERD)IJERD Editor
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AssignmentThe purpose of this assignment is to get you familiar .docxssuser562afc1
Assignment
The purpose of this assignment is to get you familiar with DES by implementing DES from scratch with the flexibility of changing some of the internal tables. For this assignment, you are not allowed to use publicly available DES-specific code (generic public code for parsing input data is allowed).
Please see the lecture slides on DES or section 7.4 on pages 250-256 of the textbook (Handbook of Applied Cryptography) (in Chapter 7).
Electronic submissions only.
Compiling
Please use a Makefile so that when the grader simply enters:
make hw5
an executable named hw5 is created. (Minor variation on the make command is allowed.) Please make sure that your submission conforms to other general compilation requirements.
Commandline Syntax & Program Output
The commandline syntax for hw5 is as follows:
hw5tablecheck-t=tablefile
hw5encrypt-k=key -t=tablefile [file]
hw5decrypt-k=key -t=tablefile [file]
hw5encrypt3-k=key3 -t=tablefile [file]
hw5decrypt3-k=key3 -t=tablefile [file]
Square bracketed items are optional. You must follow the UNIX convention that commandline options can come in any order. (Note: a commandline option is a commandline argument that begins with a - character in a commandline syntax specification.) If an input file is not specified, your program should read from stdin. Output of your program must go to stdout and error messages must go to stderr.
The meaning of the commands are:
tablecheck
:
Check the integrity of tablefile. Please see tablefile format to see the requirements.
encrypt
:
Encrypts the input using DES driven by tablefile in the ECB mode using key as the encryption key (8-byte long and in hexstring format). If the filesize of the input is not a multiple of 8 bytes, please pad it with zeroes. (Please treat file as a binary file.)
decrypt
:
Decrypts the input using DES driven by tablefile in the ECB mode using key as the encryption key (8-byte long and in hexstring format). If the filesize of the input is not a multiple of 8 bytes, please pad it with zeroes. (Please treat file as a binary file.)
encrypt3
:
Encrypts the input using EDE triple DES driven by tablefile in the ECB mode using key3 as the encryption key (24-byte long and in hexstring format). If the filesize of the input is not a multiple of 8 bytes, please pad it with zeroes. (Please treat file as a binary file.)
decrypt3
:
Decrypts the input using EDE triple DES driven by tablefile in the ECB mode using key3 as the encryption key (24-byte long and in hexstring format). If the filesize of the input is not a multiple of 8 bytes, please pad it with zeroes. (Please treat file as a binary file.)
The output for various commands are as follows.
tablecheck
:
The command should produce no output in stdout. All error output must go to stderr.
encrypt
:
The output of this command is a binary file where each 8-byte block is a direct DES encryption of the corresponding input 8-byte block.
You m ...
2. Introduction
● The Data Encryption Standard (DES) is a
symmetric-key block cipher published by the
National Institute of Standards and Technology
(NIST).
● In 1973, NIST published a request for proposals
for a national symmetric-key cryptosystem. A
proposal from IBM, a modification of a project
called Lucifer, was accepted as DES. DES was
published in the Federal Register in March 1975
as a draft of the Federal Information Processing
Standard (FIPS).
9. DES function
The heart of DES is the DES function. The DES
function applies a 48-bit key to the rightmost 32
bits to produce a 32-bit output.
10. Expansion P-box
Since RI−1 is a 32-bit input and KI is a 48-bit key, we
first need to expand RI−1 to 48 bits.
Although the relationship between the
input and output can be defined
mathematically, DES uses Table to define
this P-box.
11.
12. (XOR)
After the expansion permutation, DES uses the
XOR operation on the expanded right section and
the round key. Note that both the right section and
the key are 48-bits in length. Also note that the
round key is used only in this operation.