Can you name other black hat SEO techniques? Cloaking is one of them, in where it presents different version of web page contents from of search engines.

In SEO terminology," Black Hat SEO refers to the use of aggressive SEO strategies, techniques and tactics that focus only on search engines and not a human audience, and usually does not obey search engines rules. Some examples of Black Hat SEO techniques include keyword stuffing, invisible text and doorway pages".
Black Hat SEO is more frequently used by those who are looking for a quick financial return on their Web site, rather than a long-term investment on their Web site.
Black Hat SEO may also be referred to as Unethical SEO
"Techniques in black hat SEO"
1. Hidden Content
2. Meta Keyword Stuffing
3. Meta Keywords
4. Doorway or Gateway Pages
5. Link Farming