Sorry, no online dictionaries contain the exact phrase authentication assurance.
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Reverse dictionary results:
1. seal
2. testimony
3. aaa
4. certification
5. countersign
6. indenture
7. proof
8. verification
9. password
10. verfication
11. affirmation
12. bond
13. pledge
14. sealed
15. sealing
16. swear
17. trust
18. trusted
19. vow
20. warrant
21. score
22. acknowledgment
23. affidavit
24. affirm
25. apocryphal
26. appraiser
27. assessor
28. assume
29. attestation
30. audit
31. authenticate
32. authenticator
33. avowedly
34. card
35. cards
36. cas
37. certifiable
38. certificate
39. certified
40. certified check

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You can look up the words in the phrase individually using these links:   authentication ?   assurance ?
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