# Passphrases

The recommended value is 1000. Continue reading if you are concerned about the security or connection performance.

## Security concerns

Each character of the newly generated passphrase is randomly picked from 90 different characters. That means, passphrase of length 1 has 90 posibilities in total, passphrase of length 2 has $$90^2$$ possibilities...

Generally, passphrase of length $$n$$ has $$90^n$$ different possibilities. That means, passphrase of length 1000 has approximately around $$1.7$$ multiplied by 2000th power of $$10$$ of possibilities.

According to [this article](https://nordpass.com/blog/brute-force-attack/), such password would take more than 1900 times the [age of the universe](https://en.wikipedia.org/wiki/Age_of_the_universe) to bruteforce. Taking this into account, it is more probable that some plugin with backdoors will steal the passphrase, than the passphrase getting bruteforced **randomly**.

{% hint style="danger" %}
**Passphrase guidelines:**

* Passphrases shorter than 50 characters are considered weak. If using such passphrase, the plugin will display a warning each time the server starts.
* Never share it with anyone else.
* Regenerate it once in a while, just in case.
* Use the built-in generator only - avoid any internet communication.
  {% endhint %}

## Data payload

Each character is 1B of data (assuming ASCII character set), so passphrase of length 1000 is equal to 1kB of data transfered between the proxy and backend servers.


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