Cryptography is the science of using mathematics to encrypt and decrypt data. Cryptography enabIes you to store sensitive information or transmit it across insecure networks…

1. Block Ciphers 2. IFETCE/M.E CSE/NE7202-NIS/Unit 2 2 Learning Outcomes • Recognise the different components of the cryptographic process • Identify some of the factors…

1. Block Ciphers 2. IFETCE/M.E CSE/NE7202-NIS/Unit 2 2 Learning Outcomes • Recognise the different components of the cryptographic process • Identify some of the factors…

Classical Encryption Techniques Classical Encryption Techniques What is Cryptography? The art of secret writing The art of protection using information The science of encrypting…

Recall Techniques for Cipher design • Substitution – permutations on texts • Transposition – permutations on places We have discussed substitution-based Ciphers –…

Caesar cipher Plain: Cipher: ABCDEFGHIJKLMNOPQRSTUVWXYZ DEFGHIJKLMNOPQRSTUVWXYZABC Ciphertext: WKH TXLFN EURZQ IRA MXPSV RYHU WKH ODCB GRJ Plaintext: the quick brown fox…

Slide 1 CRYPTOGRAPHY Lecture 5 Slide 2 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z B C D E F G H I J K L M N O P Q R S T U V W X Y Z A C D E F G H I J K L M N O P…

Slide 1 Classical Monoalphabetic Ciphers Day 2 Slide 2 Keyword cipher Select a keyword, if the keyword has any repeated letters, drop all but the first occurrence. Write…

Cryptography Troy Latchman Byungchil Kim Fundamentals We know that the medium we use to transmit data is insecure, e.g. can be sniffed. Cryptography allows a sender to disguise…

Playfair Cipher Group 04: Yiyang Zhongyang Tan Xiao Introduction simple transposition offering a relatively waek method of encryption used by many countries during wartime…