MetaCaptcha Anti-spam
| Author: | Tien Le, Nhan Huynh, Thai Bui, Wuchang Feng (profile at wordpress.org) |
| WordPress version required: | 3.0 |
| WordPress version tested: | 3.5.2 |
| Plugin version: | 2.7 |
| Added to WordPress repository: | 26-06-2013 |
| Last updated: | 29-07-2013
Warning! This plugin has not been updated in over 2 years. It may no longer be maintained or supported and may have compatibility issues when used with more recent versions of WordPress.
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| Rating, %: | 100 |
| Rated by: | 1 |
| Plugin URI: | http://metacaptcha.com |
| Total downloads: | 422 |
 Click to start download |
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MetaCaptcha uses the proof-of-work (or “client puzzle”) approach for combating spam. Proof-of-work approaches slow down spammers by requiring them to solve computational puzzles before accessing a desired service. The idea is to impose a per-access cost in hopes of reducing abuse. More specifically, the cost to spammers will be computational resources that they devote to solving a puzzle before sending each message. The approach was first outlined by Dwork and Naor. However, Laurie and Clayton demonstrated that a small constant cost would fail to significantly reduce spam and a large one would burden legitimate users. Later, Liu and Camp demonstrated that if puzzle difficulties were based on user reputations then a proof-of-work approach would indeed be successful. Thus, malicious clients (spammers) would need to be issued “harder” (longer to solve) puzzles than non- malicious clients. The new comments on your blog will be sent to our MetaCAPTCHA server for spam classification.