Unverified50% confidenceFactExact time
Claude stores encrypted chain-of-thought data locally on the user's device, and during multi-turn conversations the user must send the encrypted data back to the server to be decrypted before the model can continue reasoning.
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
9/11/2026
First Seen
Valid until: 12/10/2026
Sources
Related Entities
Related Claims
UnverifiedThe root cause of the vulnerability is that encrypted reasoning blocks are portable, and the server does not verify whether a reasoning block belongs to the current user, model, or conversation after decryption.66% similarUnverifiedHomomorphic encryption can perform computations directly on encrypted data without first decrypting it, and the results are also encrypted and can only be decrypted by those who hold the key.65% similarUnverifiedTucky's user note data is stored locally on the device and encrypted by default, rather than being uploaded to a remote server.65% similar
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