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Thank you for posting in our Q&A forum.
You can see this related document:
[https://learn.microsoft.com/en-us/answers/questions/486172/birthday-attacks-against-tls-ciphers-with-64bit-(s](https://learn.microsoft.com/en-us/answers/questions/486172/birthday-attacks-against-tls-ciphers-with-64bit-(s)
Hope above information can help you.
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Wesley Li