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What (who) is discrete-exponentiation cryptosystem - definition

PUBLIC-KEY CRYPTOSYSTEM

Elgamal discrete logarithm cryptosystem; El Gamal discrete log cryptosystem; ElGamal; El Gamal; Elgamal discrete log cryptosystem; ElGamal discrete log cryptosystem; ElGamal cryptosystem; ElGamal encryption algorithm; El-Gamal; Elgamal encryption; El Gamal algorithm; El Gamal cryptosystem; ELG-E

Discrete Laplace operator

ANALOG OF THE CONTINUOUS LAPLACE OPERATO

Discrete Schrödinger operator; Discrete Green's function; Discrete laplace operator; Discrete Schrodinger operator; Discrete Schroedinger operator; Discrete Laplacian operator; Laplace filter

In mathematics, the discrete Laplace operator is an analog of the continuous Laplace operator, defined so that it has meaning on a graph or a discrete grid. For the case of a finite-dimensional graph (having a finite number of edges and vertices), the discrete Laplace operator is more commonly called the Laplacian matrix.

https://en.wikipedia.org/wiki/Discrete_Laplace_operator

Discrete group

DISCRETE SUBGROUP OF A TOPOLOGICAL GROUP G IS A SUBGROUP H SUCH THAT THERE IS AN OPEN COVER OF H IN WHICH EVERY OPEN SUBSET CONTAINS EXACTLY ONE ELEMENT OF H; IN OTHER WORDS, THE SUBSPACE TOPOLOGY OF H IN G IS THE DISCRETE TOPOLOGY

Discrete subgroup; Discrete group theory

In mathematics, a topological group like G is called a discrete group if there is no limit point in it (i.e.

https://en.wikipedia.org/wiki/Discrete_group

Discrete choice

CHOICE AMONG TWO OR MORE DISCRETE ALTERNATIVES

Discrete choice model; Discrete choice analysis; Discrete Choice; Discrete Choice Models; Binary choice model; Binary choice; Qualitative response models; Nested logit; Conditional logit; Exploded logit

In economics, discrete choice models, or qualitative choice models, describe, explain, and predict choices between two or more discrete alternatives, such as entering or not entering the labor market, or choosing between modes of transport. Such choices contrast with standard consumption models in which the quantity of each good consumed is assumed to be a continuous variable.

https://en.wikipedia.org/wiki/Discrete_choice

Wikipedia

ElGamal encryption

In cryptography, the ElGamal encryption system is an asymmetric key encryption algorithm for public-key cryptography which is based on the Diffie–Hellman key exchange. It was described by Taher Elgamal in 1985. ElGamal encryption is used in the free GNU Privacy Guard software, recent versions of PGP, and other cryptosystems. The Digital Signature Algorithm (DSA) is a variant of the ElGamal signature scheme, which should not be confused with ElGamal encryption.

ElGamal encryption can be defined over any cyclic group $G$ , like multiplicative group of integers modulo n. Its security depends upon the difficulty of a certain problem in $G$ related to computing discrete logarithms.

https://en.wikipedia.org/wiki/ElGamal encryption