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What is a Hash Function? - (BCA / B.Tech)

What is a Hash Function?

A hash function is an important computing process that converts input data of any size into a fixed-size output (hash value or hash code). This technique is used in various fields, such as data security, data integrity, and database management.

Features of a Hash Function:

Fixed Output Size: Always produces an output of a fixed, predetermined size.
Unique Output: A good hash function produces a unique hash value for different inputs (it should be "collision-resistant").
One-Way Process: It is not possible to revert the hash value back to the original data.
Sensitivity to Small Changes: A small change in the input data results in a completely different output hash value.
Speed: A hash function should work quickly to hash large datasets efficiently.

Types and Uses of Hash Functions:

Types: MD5, SHA-1, SHA-2 family, SHA-3.

Uses: Securing passwords, ensuring data integrity, digital signatures, blockchain and cryptocurrency, and database indexing.

Challenges of Hash Functions:

Collisions, the trade-off between speed and security, and vulnerability to brute-force attacks.

What is a Hash Function?

What is a Hash Function?

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