In cryptography, the ElGamal encryption system is an asymmetrical encryption algorithm for public key cryptography, based on the Diffie-Hellman key exchange. It was described by Taher Elgamal in 1985. [1] ElGamal encryption is used in free gnu privacy guard software, the latest versions of PGP and other cryptographic systems. The Digital Signature Algorithm (DSA) is a variant of the ElGamal signature scheme that should not be confused with ElGamal encryption. Diffie-Hellman Key Exchange is an asymmetrical cryptographic protocol for key exchange, whose security is based on the hardness of the calculations to solve a discrete logarithm problem. This module describes the discrete logarithm problem and describes the Diffie-Hellman key exchange protocol and its security problems, z.B. against a man-in-the-middle attack. The security of the ElGamal schema depends on the properties of the G-Displaystyle G group and all the filling patterns used on the messages. I don`t see a clear difference between these two algorithms. What are their respective advantages? ElGamal encryption is probabilistic, which means that a single clear text can be encrypted on many possible code texts, with the result that a general ElGamal encryption generates a 1:2 free-to-be extension in coded text. Welcome to asymmetric cryptography and key management! In asymmetrical cryptography or cryptography with public keys, the sender and recipient use a pair of public-private keys as opposed to the same symmetrical key, and therefore their cryptographic operations are asymmetrical.
This course first describes the principles of asymmetric cryptography and describes how the use of the key pair can provide different security properties. Next, we`ll look at the asymmetrical patterns popular in the RSA encryption algorithm and the Diffie-Hellman Key Exchange protocol, and find out how and why they work to secure communication/access. Finally, we will discuss the allocation and management of key keys, both for symmetrical key and for public keys, and describe important concepts of the allocation of public keys, such as public agencies, digital certificates and infrastructure, with public keys. This course also describes some mathematical concepts, z.B. Prime factorization and discrete logarithm, which will become the basis of the security of asymmetrical primitives, and knowledge of the work of discrete mathematics will be useful for this course; The course “symmetrical cryptography” (recommended to follow before this course) also deals with modulo-arithmetic. This course is cross-referenced and is part of the two specializations, the specialization of applied cryptography and the introduction to applied cryptography. To view this video, please enable JavaScript and consider an upgrade to a web browser that supports HTML5 video Other ElGamal-related diagrams that reach security against selected text attacks have also been suggested.