How do security tokens work?

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Tags

1. #software
2. #consists
3. #which
4. #encoded
5. #clock
6. #computer
7. #fixed
8. #seconds
9. #securid
10. #usually
11. #factory
12. #token
13. #either
14. #using
15. #almost
16. #mechanism
17. #authentication
18. #built
19. #intervals
20. #hardware
21. #creates
22. #assigned
23. #random