DES‚ which we will refer to as SDES. The S-DES encryption algorithm takes an 8-bit block of plaintext (example: 10111101) and a 10-bit key as input and produces an 8-bit block of ciphertext as output. The S-DES decryption algorithm takes an 8-bit block of ciphertext and the same 10-bit key used to produce that ciphertext as input and
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Enhancing Security using Cryptography with Matrices P.Sai Tejesh 12bce0359 VIT University Ph. No: 7502935512 Abstract : Cryptography is the study of encoding and decoding secret messages. In the information age‚ cryptography has become one of the major methods for protection in all applications like cloud computing‚ mobile security. It allows people to do business electronically without worries of deceit and deception. When people started doing business online and needed to transfer
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According to searchsecurity.techtarget.com‚ “Encryption is the conversion of data into a form‚ called a ciphertext that cannot be easily understood by unauthorized people.” In order to understand the data or the message that is being sent‚ the receiver must be able to decrypt the message. Decryption thus refers to the process of converting the message from cipher text into its original format or plaintext whereby the reader would be able to understand the message. Encryption is used to ensure the
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. The basic difference between DES and AES is that in DES plaintext block is divided into two halves before the main algorithm starts whereas‚ in AES the entire block is processed to obtain the ciphertext. Let us discuss some more differences between DES and AES with the help of the comparison chart shown below. Comparison Chart BASIS FOR COMPARISON DES (DATA ENCRYPTION STANDARD) AES (ADVANCED ENCRYPTION STANDARD) Basic In DES the data block is divided into two halves. In AES the entire data block
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Part A ( 1 ) The Vigenère cipher is a method of encrypting alphabetic text by using a key known as a running key‚ which is generated by a keyword. In a Caesar cipher‚ we have to shift every letter of the alphabet with other number of places The Vigenère cipher consists of many Caesar ciphers in sequence with different shift values. The Caesar cipher with digraph coding provides a means of increasing the key space from 26 to 676 ‚ so the key can take any value between 0 and 675 . ( 2 ) This digraph
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Introduction RSA Algorithms RSA stands for Rivest-Shamir-Adleman algorithm was invented on 1977 which is mostly used public-key cryptosystem. It was designed by Ron Rivest‚ Adi Shamir‚ and Leonard Adleman (Milanov 2009). This is the 1st crypto system which used two different keys to encrypt and decrypt the messages. In this cryptosystem it uses public key to encrypt and private key to decrypt the messages. Public key can be shared with everyone but the private key has to be with the person who
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SECURITY IN COMPUTING ABSTRACT In this technical paper a session based symmetric key cryptographic technique‚ termed as SBSKCT‚ has been proposed. This proposed technique is very secure and suitable for encryption of large files of any type. SBSKCT considers the plain text as a string with finite no. of binary bits. This input binary string is broken down into blocks of various sizes (of 2k order where k = 3‚ 4‚ 5‚ ….). The encrypted binary string is formed by shifting
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CHAPTER 1 INTRODUCTION INTRODUCTION TO STEGANOGRAPHY Steganography is the science of writing hidden messages in such a way that no one apart from the sender and intended recipient realizes there is a hidden message. In this technique‚ a secret message is hidden within an ordinary message and the extraction of it is done at its destination. The term steganography combines the two Ancient Greek words Steganos and graphein‚ where “steganos” means “covered‚ concealed‚ or protected” and “graphein”
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III. DIFFIE-HELLMAN KEY EXCHANGE ALGORITHM Hilter kilter Encryption of information requires exchange of cryptographic private key. The most difficult part in this sort of encryption is the exchange of the encryption key from sender to beneficiary without anybody capturing this key in the middle. This exchange or rather era on same cryptographic keys at both sides cryptically was made conceivable by the Diffie-Hellman calculation. The Diffie-Hellman calculation was produced by Whitfield Diffie and
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1. Triple DES Triple DES was designed to replace the original Data Encryption Standard (DES) algorithm‚ which hackers eventually learned to defeat with relative ease. At one time‚ Triple DES was the recommended standard and the most widely used symmetric algorithm in the industry. Triple DES uses three individual keys with 56 bits each. The total key length adds up to 168 bits‚ but experts would argue that 112-bits in key strength is more like it. Despite slowly being phased out‚ Triple DES still
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