hashértékre

Hashértékre is a Hungarian term that translates to "hash value" in English. It refers to a fixed-size string of characters that is generated from a larger block of data through a mathematical algorithm called a hash function. The purpose of a hash value is to provide a unique identifier for the original data.

Hash functions are designed to be one-way; it is computationally infeasible to reverse the process and reconstruct the original data from its hash value. They also aim to produce different hash values for even slightly different input data, a property known as the avalanche effect. If two pieces of data produce the same hash value, they are considered to be identical, assuming a collision-resistant hash function.

Hash values are widely used in computer science for various applications. They are crucial for data integrity checks, ensuring that data has not been tampered with during transmission or storage. By comparing the hash value of the original data with the hash value of the received or retrieved data, one can quickly detect any modifications.

Another significant application of hash values is in password security. Instead of storing passwords in plain text, systems store their hash values. When a user attempts to log in, their entered password is hashed, and the resulting hash is compared to the stored hash. This prevents attackers from accessing plain text passwords even if they breach the system's database. Hash values also play a role in data structures like hash tables, which enable efficient data retrieval.