# mathematics of asymmetric key cryptography ppt

Figure 9.1 Three groups of positive integers. Example 9.1 What is the smallest prime? 6.1.7 Generating Primes. 6.1.4 Euler’s Phi-Function. In that one key is transferred to other side before the exchange of information begins . The following are the major asymmetric encryption algorithms used for encrypting or digitally signing data. 6.1.3 Checking for Primeness. The topic of primes is a large part of any book on number theory. Asymmetric Encryption addresses these challenges in a robust way with a pair of keys: a public key and a private key. I found a succinct explanation of the math that enables asymmetric key cryptography on a web page of the Computer Science department of Cornell University. I’ll restate it here: 1976: Diffie-Hellman Key Exchange. 6.1.1 Definition. 22 Perfectly Secure Public-Key Encryption Schemes Do NOT Exist. Module II ( 8 LECTURES) Computer-based Symmetric Key Cryptographic Algorithms: Algorithm Types and Modes, An overview of Symmetric Key Cryptography, DES, International Data Encryption ... mathematics that protects our data in powerful ways. asymmetric cryptography by David Kumar Content What is a asymmetric Cryptosystem? Conventional encryption is about 1, 000 times faster than public key encryption. In asymmetric-key cryptography, plaintext and ciphertext Note-3 10.8 Symmetric-key cryptography is appropriate for long messages, and the speed of encryption/decryption is fast. Chapter 9. MAT 302:Cryptography from Euclid to Zero-Knowledge Proofs LECTURE 1. 6.1.6 Euler’s Theorem. Solution The smallest prime is 2, which is divisible by 2 (itself) and 1. How Public Keys can be trusted GnuPG Creating Key pair Handle the keys Thunderbird ... – A free PowerPoint PPT presentation (displayed as a Flash slide show) on PowerShow.com - id: 5b08ac-NDhiM Jan 2, 2012 Symmetric Cryptography Versus Asymmetric Cryptography In symmetric-key cryptography, symbols in plaintext and ciphertext are permuted or substituted. 9.1 9.1. Note A prime is divisible only by itself and 1.. 9.2 9.1.1 Continued. At the same time the two keys are generated. If c is an encryption of 0 then there exists a Asymmetric-key cryptography uses primes extensively. This operation allows two principals to set up a shared key given a public-key system. Topics discussed in this section: 3 Proof ; Let (G,E,D) be a public key encryption scheme ; operates over messages of one bit and encryption/ decryption always succeeds ; Construct an algorithm A s.t. The combination of the two encryption methods combines the convenience of public key encryption with the speed of conventional encryption. Perfectly Secure Public-Key Encryption Schemes Do NOT Exist . B. Asymmetric Encryption(Public key encryption) In Asymmetric encryption, two different keys are used for encryption and decryption process. PRIMES Asymmetric-key cryptography uses primes extensively.. While the data is encrypted at the sender’s end using the public key of the receiver and the data exchanged is decrypted by the receiver using his private key. Diffie-Hellman key agreement: Diffie-Hellman key agreement algorithm was developed by Dr. Whitfield Diffie and Dr. Martin Hellman in 1976. Symmetric and Asymmetric Key Cryptography, Steganography, Key Range and Key Size, Possible Types of Attacks. 6.1.5 Fermat’s Little Theorem. Public key encryption in turn provides a solution to key distribution and data transmission issues. 6.1.2 Cardinality of Primes. 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