In cryptography, the ElGamal encryption system is an asymmetric key encryption algorithm for public key cryptography, based on the Diffie Hellman key exchange. It was described and described by Taher Elgamal in 1985. [1] ElGamal encryption is used in the gnu Privacy Guard free software, in recent versions of PGP and other crypto-systems. The Algorithm Digital Signature (DSA) is a variant of the ElGamal signature scheme that should not be confused with ElGamal`s encryption. ElGamal encryption can be defined by any cyclic group G {displaystyle G}, as a multiplicative group of integers modulo n. Its security depends on the difficulty of a particular problem in G {displaystyle G} related to the calculation of discrete logarithms. Diffie-Hellman Key Exchange is an asymmetric cryptographic protocol for key exchange and its security is based on the computational hardness of solving a discrete logarithm problem. This module explains the discrete logarithm problem and describes the Diffie-Hellman Key Exchange protocol and its security issues, for example. B against a man-in-the-middle attack. VERY IMPRESSIVE TEACHING AND I LOVED THE COURSES VERY WELL DESCRIBE the basics and also the pace of the session is good. .

ElGamal still has some advantages, but they are more interesting when ElGamal encryption is used as a building block of «larger» cryptographic protocols. For example, I don`t see a clear difference between these two algorithms. What are their respective advantages? The code text is then a tuple $(c_1.c_2)$, consisting of the message encoded with the DH key $mcdot g^{ab}$ and the $g^a$ part of the DH key calculated by the encrypted part. However, the whole process is led by one party, that is. The party that coded the message. This party then sends the Tupel $(c_1, c_2) =(g^a,mcdot g^{ab}) to the recipient $B$. Welcome to asymmetric cryptography and key management! In asymmetric cryptography or public key cryptography, the sender and receiver use a pair of public and private keys, unlike the same symmetric key, and their cryptographic operations are therefore asymmetric. This course first examines the principles of asymmetric cryptography and describes how using the key pair can offer different security properties. Next, we`ll look at the asymmetric patterns popular in the RSA spreadsheet algorithm and in the Diffie-Hellman Key Exchange protocol and we`ll know how and why they work to secure communication/access. Finally, we will discuss key allocation and management, for both symmetric keys and public keys, and describe important concepts in the distribution of public keys such as public key authority, digital certificate, and public key infrastructure.

This course also describes some mathematical concepts, for example.B. primary factoring and discrete logarithm, which become the basis for the safety of asymmetric primitives, and the working knowledge of discrete mathematics will be useful for participating in this course; The Symmetric Cryptography course (recommended before this course) also deals with modular arithmetic. This course is cross-over and is part of the two specializations, the Applied Cryptography specialization and the Introduction to Applied Cryptography specialization….

Comments are now closed for this article