Cryptography SYMMETRIC CRYPTOSYSTEMS Symmetric Cryptosystems 1272020 pag 2
- Slides: 51
Cryptography
SYMMETRIC CRYPTOSYSTEMS Symmetric Cryptosystems 12/7/2020 | pag. 2
Block Ciphers: Classical examples • Affine Cipher • Affine Linear and Linear Cipher • Vigenère • Hill We needed some linear algebra! Symmetric Cryptosystems 12/7/2020 | pag. 3
Affine Cipher Symmetric Cryptosystems 12/7/2020 | pag. 4
Example: Cryptanalysis of the Affine Cipher Symmetric Cryptosystems 12/7/2020 | pag. 5
Intermezzo: Matrices over Rings Cryptography 12/7/2020 | pag. 6
Intermezzo: Invertible Matrices Cryptography 12/7/2020 | pag. 7
Intermezzo: Invertible Matrices Cryptography 12/7/2020 | pag. 8
Intermezzo: Invertible Matrices Cryptography 12/7/2020 | pag. 9
Intermezzo: Invertible Matrices Cryptography 12/7/2020 | pag. 10
Intermezzo: Affine Linear Functions Cryptography 12/7/2020 | pag. 11
Intermezzo: Affine Linear Functions Cryptography 12/7/2020 | pag. 12
Affine Linear Cipher Cryptography 12/7/2020 | pag. 13
Affine Linear Cipher Cryptography 12/7/2020 | pag. 14
Example: Affine Linear Cipher - Vigenère Cryptography 12/7/2020 | pag. 15
Example: Linear Cipher - Hill Cryptography 12/7/2020 | pag. 16
Example: Linear Cipher – Permutation Cipher Cryptography 12/7/2020 | pag. 17
Cryptanalysis of the Affine Linear Cipher Symmetric Cryptosystems 12/7/2020 | pag. 18
Cryptanalysis of the Affine Linear Cipher Symmetric Cryptosystems 12/7/2020 | pag. 19
Cryptanalysis of the Affine Linear Cipher Symmetric Cryptosystems 12/7/2020 | pag. 20
Example: Cryptanalysis of the Affine Linear Cipher FUSS. Symmetric Cryptosystems 12/7/2020 | pag. 21
Block Ciphers: Remark Secure block ciphers must not be (affine) linear or easy to approximate by linear functions!!! Cryptography 12/7/2020 | pag. 22
Block Ciphers: Remark Implementation of a (non-linear!) substitution in a block cipher often occurs through a look-up table, called S-box. Cryptography 12/7/2020 | pag. 23
Block Ciphers: Advanced examples • DES – Feistel Cipher • AES – Rijndael Symmetric Cryptosystems 12/7/2020 | pag. 24
DES Cryptography 12/7/2020 | pag. 25
DES: Feistel Cipher An iterated block cipher is a block cipher involving the sequential repetition of an internal function called rounds. (iterated) Cryptography 12/7/2020 | pag. 26
DES: Feistel Cipher Cryptography 12/7/2020 | pag. 27
DES: Feistel Cipher Cryptography 12/7/2020 | pag. 28
DES: Algorithm Cryptography 12/7/2020 | pag. 29
DES: Algorithm Cryptography 12/7/2020 | pag. 30
DES: Algorithm Cryptography 12/7/2020 | pag. 31
DES: Algorithm Cryptography 12/7/2020 | pag. 32
DES: Algorithm Cryptography 12/7/2020 | pag. 33
DES: Algorithm Cryptography 12/7/2020 | pag. 34
DES: Algorithm Cryptography 12/7/2020 | pag. 35
DES: Algorithm Cryptography 12/7/2020 | pag. 36
DES: Algorithm Cryptography 12/7/2020 | pag. 37
DES: S-Boxes Cryptography 12/7/2020 | pag. 38
DES: Algorithm Cryptography 12/7/2020 | pag. 39
DES: Algorithm Cryptography 12/7/2020 | pag. 40
DES: Algorithm Cryptography 12/7/2020 | pag. 41
DES: Algorithm Cryptography 12/7/2020 | pag. 42 Round number Number of left rotations 1 1 2 1 3 2 4 2 5 2 6 2 7 2 8 2 9 1 10 2 11 2 12 2 13 2 14 2 15 2 16 1
DES: Algorithm Cryptography 12/7/2020 | pag. 43
DES: Algorithm Cryptography 12/7/2020 | pag. 44
DES: Algorithm Cryptography 12/7/2020 | pag. 45
Example: DES Key Conversion Code - Chart DECI 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 MAL HEX 0 1 2 3 4 5 6 7 8 9 A B C D E F BINA 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111 RY Cryptography 12/7/2020 | pag. 46
Example: S-Box Cryptography 12/7/2020 | pag. 47
Example: DES Cryptography 12/7/2020 | pag. 48
Example: DES Cryptography 12/7/2020 | pag. 49
Example: DES Cryptography 12/7/2020 | pag. 50
Example: DES Cryptography 12/7/2020 | pag. 51
Engmae
Cryptosystems
Why cryptosystems fail
Classical cryptosystems
Principles of public key cryptography
Why cryptosystems fail
Cryptosystem
Chapter 10: other public-key cryptosystems
Hindi naman platero hindi naman panday
Cryptography
Cryptography security services
Source
A murder has been committed
Snake oil cryptography
Elliptic curves number theory and cryptography
Cryptography topics crossword
Cryptography
Placement of encryption function
Access control in cryptography
Bob alice private key
Wireless security in cryptography and network security
Dan boneh cryptography
Online cryptography course
Approaches to message authentication
Cryptography penetration testing
Cryptography means
Cryptography in computer networks
Cryptography
Introduction to cryptography and network security
Euler's theorem in cryptography and network security
Classical cryptography techniques
Cryptology chapter 8 ccccure
Cryptography
Cryptology cryptography cryptanalysis
Cryptography in distributed system
Cryptography
Cryptography fundamentals
Cryptography 101
Pigpen
Pgp in cryptography and network security
Cryptography
Elliptic curve cryptography applications
Digital signature in cryptography and network security
New directions in cryptography
Rsa encryption history
Authentication in cryptography and network security
Elliptic curve cryptography
Ciphertext alphabet
Assymmetric cryptography
Security services in cryptography
Cryptography and network security 4th edition
Cryptography
