# Key Exchange (Key Exchange)

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## Description

Key exchange (also key establishment) is a method in cryptography by which cryptographic keys are exchanged between two parties, allowing use of a cryptographic algorithm.

## Parameters

$n$: maximum size of numbers (prime, parameters, keys), in bits

## Table of Algorithms

Name | Year | Time | Space | Approximation Factor | Model | Reference |
---|---|---|---|---|---|---|

Diffie–Hellman key exchange | 1978 | $O(mult(n)$*n) where mult(n) is running time on n-bit multiplication | $O(n)$ | Exact | Deterministic | Time |

Elliptic-curve Diffie-Hellman (ECDH) | 2006 | $O(mult(n)$*n^{2})? where mult(n) is running time on n-bit multiplication | $O(n)$ | Exact | Deterministic | Time |