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> 2. We've been working with researchers at a local university to ensure the anonymity around location was such that they couldn't determine groups of whispers from the same user. They contributed to our randomization algorithms and provided suggestions around security.

Recently, there was a paper by researchers at UCSB on anonymity on Whisper (Page 10, Section 7). I must say that Whisper seems to have mitigated the attack presented in the paper.

https://www.cs.ucsb.edu/~ravenben/publications/pdf/whisper-i...



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