Is Telegram secret chat secure?

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Tags

1. #sicher
2. #encryption
3. #telegram
4. #chats
5. #about
6. #whatsapp
7. #completely
8. #local
9. #windows
10. #messengers
11. #secret
12. #secure
13. #storage
14. #threema
15. #phone
16. #security
17. #optional
18. #encrypted
19. #paranoid
20. #android