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Hashed fingerprint missing on RSA relay identity key #3

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opened 2025-07-13 15:15:29 +00:00 by irl · 0 comments
irl commented 2025-07-13 15:15:29 +00:00
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The "hashed fingerprint" is used to refer to bridges in the Tor Metrics system and other monitoring frameworks where you do not want to share the fingerprint, as this can be used to query the Bridge Authority and end up revealing the bridge connection details.

This is the SHA1 hash of the binary form of the fingerprint.

As a test case:

Fingerprint:        DA5CEC632A9A544394403BD533E1A7BDE2F26EDD
Hashed fingerprint: 922650D27357BE307B3B322A5ABC3E9585AF776F

You can do this in the shell with:

echo -n DA5CEC632A9A544394403BD533E1A7BDE2F26EDD | xxd -r -p | sha1sum
The "hashed fingerprint" is used to refer to bridges in the Tor Metrics system and other monitoring frameworks where you do not want to share the fingerprint, as this can be used to query the Bridge Authority and end up revealing the bridge connection details. This is the SHA1 hash of the binary form of the fingerprint. As a test case: ``` Fingerprint: DA5CEC632A9A544394403BD533E1A7BDE2F26EDD Hashed fingerprint: 922650D27357BE307B3B322A5ABC3E9585AF776F ``` You can do this in the shell with: ``` echo -n DA5CEC632A9A544394403BD533E1A7BDE2F26EDD | xxd -r -p | sha1sum ```
abel was assigned by irl 2025-07-13 15:15:36 +00:00
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Reference: ops/terraform-provider-tor#3
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