# Lyra2

> key derivative function

**Wikidata**: [Q25000684](https://www.wikidata.org/wiki/Q25000684)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Lyra2)  
**Source**: https://4ort.xyz/entity/lyra2

## Summary
Lyra2 is a key derivation function designed to derive one or more secret keys from a secret value. It functions as a secure method for transforming passwords or other inputs into cryptographic keys suitable for encryption or authentication purposes.

## Key Facts
-   Lyra2 is an **instance of** a key derivation function.
-   Its **official website** is located at `http://lyra-2.net/`.
-   It has a **sitelink count** of 2 on its Wikidata entity.
-   Its **Wikipedia title** is "Lyra2".
-   Lyra2 is documented in **Wikipedia languages** English (`en`) and Russian (`ru`).
-   The **Wikidata description** explicitly states it is a "key derivative function".
-   It has a **Google Knowledge Graph ID** of `/g/11cm9hb1h1`.

## FAQs
### Q: What is Lyra2 primarily used for?
A: Lyra2 is primarily used as a key derivation function to securely transform a secret value, like a password, into one or more cryptographic keys.

### Q: Is Lyra2 related to other key derivation functions?
A: Yes, as a key derivation function, it shares the core purpose and classification with other similar cryptographic algorithms designed to generate keys from secrets.

### Q: Where can I find official information about Lyra2?
A: Its official website is available at `http://lyra-2.net/`. It also has entries in Wikipedia (English and Russian) and Wikidata.

### Q: What classification does Lyra2 fall under?
A: Lyra2 is explicitly classified as a key derivative function.

## Why It Matters
Lyra2 matters because key derivation functions are fundamental building blocks in modern cryptography for securing sensitive data. They provide the mechanism to safely derive encryption keys from user-provided secrets like passwords, ensuring that even if the secret is weak or stolen, the derived keys remain computationally difficult to discover. As a key derivative function, Lyra2 contributes to the suite of tools available for designing secure password storage and key management systems. Its existence and classification highlight the ongoing development and importance of robust, standardized methods for deriving cryptographic material from potentially unreliable human inputs, forming a critical layer of defense in securing digital assets and communications.

## Notable For
*   Being explicitly classified and recognized as a **key derivation function** across authoritative sources like Wikidata and Wikipedia.
*   Having its own **dedicated website** (`http://lyra-2.net/`) for official information and resources.
*   **Multilingual documentation**, being featured in both **English and Russian** Wikipedia entries.
*   Possessing a unique **Google Knowledge Graph ID** (`/g/11cm9hb1h1`), indicating its specific entity recognition in Google's knowledge base.

## Body
### Classification
Lyra2 is unambiguously defined as a key derivation function. This places it within the broader category of cryptographic algorithms whose primary purpose is to derive cryptographic keys from a secret value (e.g., a user password) and a salt.

### Representation
Lyra2 is formally represented in several major knowledge repositories:
*   **Wikidata**: It exists as a distinct entity (`Q` item) with the description "key derivative function" and has 2 sitelinks.
*   **Wikipedia**: It has articles titled "Lyra2" in **English** (`en`) and **Russian** (`ru`).
*   **Google Knowledge Graph**: It has a unique identifier: `/g/11cm9hb1h1`.
*   **Official Domain**: It maintains an official presence at the website `http://lyra-2.net/`.