Using CAPTCHA technology: pros and cons. Ways to secure from spam-bots attacks.

: pp. 102-110
Accepted: March 28, 2017
Lviv Politechnik National University
Lviv Politechnik National University

This paper is devoted to CAPTCHA technology. Algorithms of creation and work of captcha are described. The scheme of how captcha works is also included. The means of encoding and ‘complication’ of decoded text are described. The main ways of automatic captcha’s recognition are described. Also, it is given in examples options of CAPTCHA’s tests. The programing means that do not require user’s actions are considered. By the way, pros and cons of testing captcha are analyzed. In addition, the main problems that may occur during developing captcha are analyzed.

1. CAPTCHA [Electronic resource] – Access mode:  

2. Web services security from spam [Electronic resource] – Access mode:  

3. Checking captcha algorithm [Electronic resource] – Access mode:

4. Building a security image [Electronic resource] – Access mode:

5. Alternative ways of security [Electronic resource] – Access mode:

6. CAPTCHA [Electronic resource] – Access mode:

7. CAPTCHA: humans and computers [Electronic resource] – Access mode: