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@ -13,8 +13,9 @@ For example, build a simple web debugging proxy on the shared servers.
### Spam filtering strategy
* [K-Anonymity](https://en.wikipedia.org/wiki/K-anonymity) test - Estimating whether the characters has been arranged by humans. (use [Have I Been Pwned](https://haveibeenpwned.com/Passwords))
* Not CAPTCHA - Image spam containing characters that look very similar to CAPTCHA. (use [TrueCaptcha](https://truecaptcha.org/))
* VowelRatio10 - In characters arranged by humans, there is a high frequency of vowels (aeiou) included in strings that are 10 characters.
* Not CAPTCHA - Image spam containing characters that look very similar to [CAPTCHA](https://en.wikipedia.org/wiki/CAPTCHA). (use [TrueCaptcha](https://truecaptcha.org/))
* VowelRatio10 - In characters arranged by humans, there is a high frequency of [vowels](https://en.wikipedia.org/wiki/Vowel) (aeiou) included in strings that are 10 characters.
* Palindrome5 - Detect [palindromes](https://en.wikipedia.org/wiki/Palindrome) composed of 5 or more characters.
* SSL decryption (MITM) when relaying to federated servers.
The strategies were implemented to respond to [the Fediverse Spam Attacks which started on the 15th of February](https://github.com/Mastodon-DE/blocklists/blob/main/spam%2F2024-02-15%2F2024-02-15-spam-mute-list.md).