# Quiz 12

Why is SHA-1 considered insecure today? (Choose all that apply)

**Add answers and select the correct ones**

* [x] It is prone to collision attacks
* [x] Computing power has increased, making it vulnerable
* [ ] It cannot produce a fixed-length output
* [ ] It was never widely adopted<br>

**Note to learners**\
\
In 2005, it was shown it’s possible to muster the necessary computing power to find a collision for a SHA-1 hash value... As a result, SHA-1 is now considered insecure.

&#x20;

To learn more about it, you can follow the course [SHA256](https://bsvblockchain.360learning.com/course/play/68bac0569f76953779e261a6)


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://hub.bsvblockchain.org/higher-learning/bsv-academy/bitcoin-primitives-hash-functions/quiz-bitcoin-hash-functions/quiz-12.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.