Consumer Rights Wiki

Signal data collection: Difference between revisions

← Older edit
VisualWikitext
NoGoodDeed (talk | contribs)
confirmed
64 edits
m Fix typos
Fixed autocorrect typo
 
(17 intermediate revisions by 9 users not shown)
Line 1: Line 1:
{{ToneWarning}}


Signal is an open source encrypted messaging service that is frequently recommended to highly vulnerable users such as human rights activists, whistleblowers, and journalists whose lives and/or freedom can depend on their ability to maintain private and secure communication. Since 2020 Signal has been collecting and keeping sensitive user data in the cloud while lying to their users about their data collection practices. Users and potential users of Signal have a right to know what data is being collected and how it is being stored and secured so that they make informed choices about the risks they are taking when using Signal.  
Signal is an open source encrypted messaging service that is frequently recommended to users who rely on data security, such as human rights activists, whistleblowers, and journalists whose lives and/or freedom can depend on their ability to maintain private and secure communication.  
 
In 2020, Signal has been accused of quietly collecting and storing sensitive user data on their cloud database without obtaining user consent.  


==Background==
==Background==
Over the years Signal has curated a reputation that they do not collect or keep data on their users.
Over the years Signal has curated a reputation that they do not collect or keep data on their users.


Signal has publicly disclosed that they have received legal requests for subscriber's names, telephone numbers, histories, and contacts and Signal has said that they were unable to supply that information because it was never collected by Signal in the first place. These incidents have been reported in the media<ref>{{Cite web |title=FBI demands Signal user data, but there’s not much to hand over |url=https://arstechnica.com/tech-policy/2016/10/fbi-demands-signal-user-data-but-theres-not-much-to-hand-over/ |archive-url=https://web.archive.org/web/20240401002649/https://arstechnica.com/tech-policy/2016/10/fbi-demands-signal-user-data-but-theres-not-much-to-hand-over/ |archive-date=04/01/24}}</ref>
Signal has publicly disclosed that they have received legal requests for subscriber's names, telephone numbers, histories, and contacts and Signal has said that they were unable to supply that information because it was never collected by Signal in the first place. These incidents have been reported in the media.<ref>{{Cite web |title=FBI demands Signal user data, but there’s not much to hand over |url=https://arstechnica.com/tech-policy/2016/10/fbi-demands-signal-user-data-but-theres-not-much-to-hand-over/ |archive-url=https://web.archive.org/web/20240401002649/https://arstechnica.com/tech-policy/2016/10/fbi-demands-signal-user-data-but-theres-not-much-to-hand-over/ |archive-date=1 Apr 2024 |access-date=6 Mar 2025}}</ref>


Signal's website states<ref name=":0">{{Cite web |title=Grand jury subpoena for Signal user data, Eastern District of Virginia |url=https://signal.org/bigbrother/eastern-virginia-grand-jury/ |archive-url=https://web.archive.org/web/20250302042109/https://signal.org/bigbrother/eastern-virginia-grand-jury/ |archive-date=03/02/25}}</ref>:
Signal's website states:<ref name=":0">{{Cite web |title=Grand jury subpoena for Signal user data, Eastern District of Virginia |url=https://signal.org/bigbrother/eastern-virginia-grand-jury/ |archive-url=https://web.archive.org/web/20250302042109/https://signal.org/bigbrother/eastern-virginia-grand-jury/ |archive-date=2 Mar 2025 |access-date=6 Mar 2025}}</ref>


''"We’ve designed the Signal service to minimize the data we retain about Signal users, so the only information we can produce in response to a request like this is the date and time a user registered with Signal and the last date of a user’s connectivity to the Signal service.''  
''"We’ve designed the Signal service to minimize the data we retain about Signal users, so the only information we can produce in response to a request like this is the date and time a user registered with Signal and the last date of a user’s connectivity to the Signal service.''  
Line 15: Line 16:
''Notably, things we don’t have stored include anything about a user’s contacts (such as the contacts themselves, a hash of the contacts, any other derivative contact information), anything about a user’s groups (such as how many groups a user is in, which groups a user is in, the membership lists of a user’s groups), or any records of who a user has been communicating with."''
''Notably, things we don’t have stored include anything about a user’s contacts (such as the contacts themselves, a hash of the contacts, any other derivative contact information), anything about a user’s groups (such as how many groups a user is in, which groups a user is in, the membership lists of a user’s groups), or any records of who a user has been communicating with."''


==Data collection begins==
==Incident==
Signal's data collection practices changed in 2019 when Signal previewed a feature they called "secure value recovery".<ref>{{Cite web |title=Technology Preview for secure value recovery |url=https://signal.org/blog/secure-value-recovery/ |archive-url=https://web.archive.org/web/20241228040757/https://signal.org/blog/secure-value-recovery/ |archive-date=12/28/24}}</ref>
In 2019, Signal previewed a feature called "secure value recovery".<ref>{{Cite web |title=Technology Preview for secure value recovery |url=https://signal.org/blog/secure-value-recovery/ |archive-url=https://web.archive.org/web/20241228040757/https://signal.org/blog/secure-value-recovery/ |archive-date=28 Dec 2024 |access-date=6 Mar 2025}}</ref> This feature would allow users installing signal on a new device to pull down the user's encrypted data from cloud servers.<ref>{{Cite web |title=Technology Preview for secure value recovery |url=https://signal.org/blog/secure-value-recovery/ |archive-url=https://web.archive.org/web/20241228040757/https://signal.org/blog/secure-value-recovery/ |archive-date=28 Dec 2024 |access-date=6 Mar 2025}}</ref>


This new feature meant that Signal would start collecting the same kinds of information that Signal had been getting legal requests to turn over, and that Signal would permanently keep that data in the cloud. Their stated reason for doing this was so that if a Signal user got a new device they could install the app, enter a pin, and the app would pull down the user's data from cloud servers.  
This new feature has been accused of being a breach of privacy, with claims that Signal would start collecting the same kinds of information that Signal had been getting legal requests to turn over, and that Signal would keep that data in the cloud. As discussed later on, whilst the data is stored in the cloud, it is stored in a securely encrypted manner.<ref name=":7" />


The data being collecting and stored in could includes: The user's name, photo, phone number, and a list of every Signal user they have contacted.<ref>{{Cite web |title=What contact info does the Signal PIN functionality actually save |url=https://community.signalusers.org/t/what-contact-info-does-the-signal-pin-functionality-actually-save/16854/4}}</ref>  
The data being collected and stored in the cloud includes the user's name, photo, phone number, and a list of every Signal user they have contacted.<ref>{{Cite web |title=What contact info does the Signal PIN functionality actually save |url=https://community.signalusers.org/t/what-contact-info-does-the-signal-pin-functionality-actually-save/16854/4 |access-date=6 Mar 2025}}</ref>{{DisputedInline|Cited source is heavily cherry picked|reason=contact discovery on Signal is private and does not share the phone number as explained later in the cited sources}} Messages are not saved, however. 


This was a highly controversial change, and some Signal users objected on philosophical grounds<ref>{{Cite web |title=Don’t want PIN, don’t want anything stored in cloud |url=https://community.signalusers.org/t/dont-want-pin-dont-want-anything-stored-in-cloud/14057 |archive-url=https://web.archive.org/web/20240301015109/https://community.signalusers.org/t/dont-want-pin-dont-want-anything-stored-in-cloud/14057 |archive-date=03/01/24}}</ref>, requesting that Signal instead provide a means to export encrypted backups that could be imported locally eliminating any need to upload data to the cloud. Signal users also raised technical concerns about the security of the system and doubts that it would protect their data.<ref>{{Cite web |title=Proper secure value security: PINs are too easy to brute force, SGX is not reliable enough |url=https://community.signalusers.org/t/proper-secure-value-security-pins-are-too-easy-to-brute-force-sgx-is-not-reliable-enough/15096 |archive-url=https://web.archive.org/web/20240301015110/https://community.signalusers.org/t/proper-secure-value-security-pins-are-too-easy-to-brute-force-sgx-is-not-reliable-enough/15096 |archive-date=03/01/24}}</ref> Some of these concerns were also shared by cybersecurity-experts<ref>{{Cite web |title=Signal’s New PIN Feature Worries Cybersecurity Experts |url=https://www.vice.com/en/article/signal-new-pin-feature-worries-cybersecurity-experts/ |archive-url=https://web.archive.org/web/20250117232443/https://www.vice.com/en/article/signal-new-pin-feature-worries-cybersecurity-experts/ |archive-date=01/17/25}}</ref> and security researchers demonstrated that the system was vulnerable to attacks which allowed them to access the user data being stored.<ref>{{Cite web |title=SGX CacheOut SGAxe attack. Signal’s cloud storage and contact discovery vulnerable |url=https://community.signalusers.org/t/sgx-cacheout-sgaxe-attack-signals-cloud-storage-and-contact-discovery-vulnerable/14892 |archive-url=https://web.archive.org/web/20230519115856/https://community.signalusers.org/t/sgx-cacheout-sgaxe-attack-signals-cloud-storage-and-contact-discovery-vulnerable/14892 |archive-date=05/19/23}}</ref>
This was a highly controversial change, and some Signal users objected on philosophical grounds,<ref>{{Cite web |title=Don’t want PIN, don’t want anything stored in cloud |url=https://community.signalusers.org/t/dont-want-pin-dont-want-anything-stored-in-cloud/14057 |archive-url=https://web.archive.org/web/20240301015109/https://community.signalusers.org/t/dont-want-pin-dont-want-anything-stored-in-cloud/14057 |archive-date=1 Mar 2024 |access-date=6 Mar 2025}}</ref><ref>{{Cite web |title=PIN, cloud storage are showstoppers |url=https://old.reddit.com/r/signal/comments/ghsj5b/pin_cloud_storage_are_showstoppers/}}</ref><ref>{{Cite web |title=Forced PIN, bite it Signal |url=https://old.reddit.com/r/signal/comments/hkle3d/forced_pin_bite_it_signal/}}</ref><ref>{{Cite web |title=Welcome to the cloud Signal users! |url=https://old.reddit.com/r/signal/comments/hkl914/welcome_to_the_cloud_signal_users/}}</ref> requesting that Signal instead provide a means to export encrypted backups that could be imported locally eliminating any need to upload data to the cloud. Signal users also raised technical concerns about the security of the system and doubts that it would protect their data.<ref name=":1">{{Cite web |title=Proper secure value security: PINs are too easy to brute force, SGX is not reliable enough |url=https://community.signalusers.org/t/proper-secure-value-security-pins-are-too-easy-to-brute-force-sgx-is-not-reliable-enough/15096 |archive-url=https://web.archive.org/web/20240301015110/https://community.signalusers.org/t/proper-secure-value-security-pins-are-too-easy-to-brute-force-sgx-is-not-reliable-enough/15096 |archive-date=1 Mar 2024 |access-date=6 Mar 2025}}</ref> Some of these concerns were also shared by cybersecurity experts<ref name=":2">{{Cite web |title=Signal’s New PIN Feature Worries Cybersecurity Experts |url=https://www.vice.com/en/article/signal-new-pin-feature-worries-cybersecurity-experts/ |archive-url=https://web.archive.org/web/20250117232443/https://www.vice.com/en/article/signal-new-pin-feature-worries-cybersecurity-experts/ |archive-date=17 Jan 2025 |access-date=6 Mar 2025}}</ref><ref name=":3">{{Cite web |title=Signal Going to Cloud? A Discussion with Sean O'Brien |url=https://www.youtube.com/watch?v=PFi-VI7_T3o}}</ref><ref name=":4">{{Cite web |title=Does Signal’s “secure value recovery” really work? |url=https://palant.info/2020/06/16/does-signals-secure-value-recovery-really-work/}}</ref> and security researchers demonstrated that the system was vulnerable to attacks which allowed them to access the user data being stored.<ref>{{Cite web |title=SGX CacheOut SGAxe attack. Signal’s cloud storage and contact discovery vulnerable |url=https://community.signalusers.org/t/sgx-cacheout-sgaxe-attack-signals-cloud-storage-and-contact-discovery-vulnerable/14892 |archive-url=https://web.archive.org/web/20230519115856/https://community.signalusers.org/t/sgx-cacheout-sgaxe-attack-signals-cloud-storage-and-contact-discovery-vulnerable/14892 |archive-date=19 May 2023 |access-date=6 Mar 2025}}</ref>{{DisputedInline|reason="In recent weeks, Signal has introduced more features that make it more user friendly to people who may not have extremely paranoid threat models. For example, it’s now possible to migrate all Signal data, including message history, from one phone to another, using a feature that does not rely on cloud servers and is also encrypted, according to Signal. "|Cited vice article explains more nuance}}
 
There were also complaints specific to the implementation of the new pin feature<ref>{{Cite web |title=An terrible experience with Signal PIN |url=https://old.reddit.com/r/signal/comments/hkbyzu/an_terrible_experience_with_signal_pin/}}</ref><ref name=":5">{{Cite web |title=Can someone explain this new PIN system? |url=https://old.reddit.com/r/signal/comments/ggty6n/can_someone_explain_this_new_pin_system/}}</ref>, for example how often it required users to re-enter their PIN, or how it would make it harder to convince friends and family to use the app, but this was not a major issue. The main problem was that Signal's new data collection practices introduced new risks for Signal users that didn't exist before.<ref name=":1" /><ref name=":2" /><ref name=":3" /><ref name=":4" /> 
 
Those who to read Signal's privacy policy looking for clarification can still be left confused and unaware of the change in data collection practices due to the organization's neglect in updating relevant language to reflect these changes.


===Signal's response===
===Signal's response===


Signal was not convinced to abandon this data collection and they began to roll out the change in 2020 without clear communication about the new feature which resulted in a lot of confusion for users, many of whom only learned about this feature when they were prompted to create a PIN. There were many social media posts expressing confusion over what the feature was and what it was doing. Even years after the change was made some Signal users were/are still unsure about what data Signal collects or were/are convinced that Signal doesn't collect any data at all<ref>{{Cite web |title=What info does Signal store about it's user? |url=https://old.reddit.com/r/signal/comments/q5tlg1/what_info_does_signal_store_about_its_user/ |archive-url=https://web.archive.org/web/20211011111619/https://old.reddit.com/r/signal/comments/q5tlg1/what_info_does_signal_store_about_its_user/ |archive-date=10/11/21}}</ref><ref>{{Cite web |title=About data collection and data delivery |url=https://old.reddit.com/r/signal/comments/1id3xu8/about_data_collection_and_data_delivery/ |archive-url=https://web.archive.org/web/20250201072439/https://old.reddit.com/r/signal/comments/1id3xu8/about_data_collection_and_data_delivery/?ref=readnext |archive-date=02/01/25}}</ref>  
Signal did not choose to reverse their decision on this data collection, and they began to roll out the change in 2020 without clear communication with the public or app users about the new feature.<ref name=":5" /><ref>{{Cite web |title=Mandatory PIN without clear explanation within the app might cause significant number of users to quit using Signal |url=https://community.signalusers.org/t/mandatory-pin-without-clear-explanation-within-the-app-might-cause-significant-number-of-users-to-quit-using-signal/11597}}</ref><ref name=":6" /> Signal users queried the need for the PIN, and communication from the team suggested it was to ensure messages were not missed or lost, by keeping messages logged in a cloud format.<ref>{{Cite web |title=I don’t understand what the new PIN requirement is for |url=https://community.signalusers.org/t/i-don-t-understand-what-the-new-pin-requirement-is-for/13895}}</ref> A more detailed response from Signal, following user backlash, explains that cloud backups were encrypted in the same way as messages, and were safe; however, this response was not published prior to the initial rollout.<ref name=":7" />


This confusion is understandable, since Signal's own website continues to state that they do not collect the information they are collecting. The first line of their "Terms & Privacy Policy" page reads: "Signal is designed to never collect or store any sensitive information."<ref>{{Cite web |title=Signal Terms & Privacy Policy |url=https://signal.org/legal/ |archive-url=https://web.archive.org/web/20250302122622/https://signal.org/legal/ |archive-date=03/02/25}}</ref>
It resulted in a lot of confusion for users, many of whom only learned about this feature when they were prompted to create a PIN. There were many social media posts expressing confusion over what the feature was and what it was doing.<ref>{{Cite web |title=What contact info does the Signal PIN functionality actually save? |url=https://community.signalusers.org/t/what-contact-info-does-the-signal-pin-functionality-actually-save/16854}}</ref><ref>{{Cite web |title=Following user backlash, Signal lowers one of its drastic PIN measures |url=https://www.androidpolice.com/2020/05/29/many-signal-users-arent-happy-with-new-pin-requirements/}}</ref> <ref name=":6">{{Cite web |title=What exactly is Signal protecting with the mandatory PIN? |url=https://old.reddit.com/r/signal/comments/hymlfd/what_exactly_is_signal_protecting_with_the/}}</ref> Even years after the change was made, some Signal users were/are still unsure about what data Signal collects or were/are convinced that Signal doesn't collect any data at all.<ref>{{Cite web |title=What info does Signal store about it's user? |url=https://old.reddit.com/r/signal/comments/q5tlg1/what_info_does_signal_store_about_its_user/ |archive-url=https://web.archive.org/web/20211011111619/https://old.reddit.com/r/signal/comments/q5tlg1/what_info_does_signal_store_about_its_user/ |archive-date=11 Oct 2021 |access-date=6 Mar 2025}}</ref><ref>{{Cite web |title=About data collection and data delivery |url=https://old.reddit.com/r/signal/comments/1id3xu8/about_data_collection_and_data_delivery/ |archive-url=https://web.archive.org/web/20250201072439/https://old.reddit.com/r/signal/comments/1id3xu8/about_data_collection_and_data_delivery/?ref=readnext |archive-date=1 Feb 2025 |access-date=6 Mar 2025}}</ref>  


This lie is also repeated on their support page under the heading: How do I know my communication is private<ref>{{Cite web |title=How do I know my communication is private? |url=https://support.signal.org/hc/en-us/articles/360007318911-How-do-I-know-my-communication-is-private |archive-url=https://web.archive.org/web/20250214030028/https://support.signal.org/hc/en-us/articles/360007318911-How-do-I-know-my-communication-is-private |archive-date=02/14/25}}</ref>
Some users are still confused by the situation regarding data collection, as Signal's own website to date states that they do not collect the message information they are collecting. The first line of their "Terms & Privacy Policy" page reads: "Signal is designed to never collect or store any sensitive information". This statement highlights the discrepancy between Signal's communicated mission and their exhibited data practices. This may be confusing to some users because relevant evidence currently contradicts the platform's otherwise clear data collection policies. <ref>{{Cite web |title=Signal Terms & Privacy Policy |url=https://signal.org/legal/ |archive-url=https://web.archive.org/web/20250302122622/https://signal.org/legal/ |archive-date=2 Mar 2025 |access-date=6 Mar 2025}}</ref>


There is no indication on Signal's older pages, which claim they don't collect this information, that the data collection policy discussed on those pages is now outdated either.
This message is repeated on their support page under the heading: How do I know my communication is private?<ref>{{Cite web |title=How do I know my communication is private? |url=https://support.signal.org/hc/en-us/articles/360007318911-How-do-I-know-my-communication-is-private |archive-url=https://web.archive.org/web/20250214030028/https://support.signal.org/hc/en-us/articles/360007318911-How-do-I-know-my-communication-is-private |archive-date=14 Feb 2025 |access-date=6 Mar 2025}}</ref> This may confuse some people into believing that their messages and data have no backups on external servers.


Requests have been made for Signal to update their policy following the change in data collection<ref>{{Cite web |title=Can Signal please update its Privacy Policy |url=https://community.signalusers.org/t/can-signal-please-update-its-privacy-policy/15323 |archive-url=https://web.archive.org/web/20230519120053/https://community.signalusers.org/t/can-signal-please-update-its-privacy-policy/15323 |archive-date=05/19/23}}</ref><ref>{{Cite web |title=Signal’s Terms of Use and Privacy Policy are not very user friendly |url=https://community.signalusers.org/t/signals-terms-of-use-and-privacy-policy-are-not-very-user-friendly/11047}}</ref>
There is no indication on Signal's older pages, which claim they don't collect this information, that the data collection policy discussed on those pages is now outdated. Examples include:  


''"Signal is designed to never collect or store any sensitive information. " - https://support.signal.org/hc/en-us/articles/360007059412-Signal-and-the-General-Data-Protection-Regulation-GDPR''


'''Workarounds'''
''"The Signal service does not have any knowledge of your contacts. Data is all owned by your phone." - https://support.signal.org/hc/en-us/articles/360007061452-Does-Signal-send-my-number-to-my-contacts''
 
''"In addition to the end-to-end encryption that protects every Signal message, the Signal service is designed to minimize the data that is retained about Signal users. By design, it does not store a record of your contacts, social graph, conversation list, location, user avatar, user profile name, group memberships, group titles, or group avatars." - https://signal.org/blog/sealed-sender/''
 
''"Notably, things we don’t have stored include anything about a user’s contacts (such as the contacts themselves, a hash of the contacts, any other derivative contact information), anything about a user’s groups (such as how many groups a user is in, which groups a user is in, the membership lists of a user’s groups), or any records of who a user has been communicating with." - https://signal.org/bigbrother/eastern-virginia-grand-jury/''
 
''"Because we’ve built Signal to completely avoid storing any sensitive information...." - https://signal.org/blog/looking-back-as-the-world-moves-forward/''
 
''Requests have been mad''e for Signal to update their policy following the change in data collection.<ref>{{Cite web |title=Can Signal please update its Privacy Policy |url=https://community.signalusers.org/t/can-signal-please-update-its-privacy-policy/15323 |archive-url=https://web.archive.org/web/20230519120053/https://community.signalusers.org/t/can-signal-please-update-its-privacy-policy/15323 |archive-date=19 May 2023 |access-date=6 Mar 2025}}</ref><ref>{{Cite web |title=Signal’s Terms of Use and Privacy Policy are not very user friendly |url=https://community.signalusers.org/t/signals-terms-of-use-and-privacy-policy-are-not-very-user-friendly/11047 |archive-url=https://web.archive.org/web/20250306164621/https://community.signalusers.org/t/signals-terms-of-use-and-privacy-policy-are-not-very-user-friendly/11047 |archive-date=6 Mar 2025 |access-date=6 Mar 2025}}</ref>


While some social media posts and articles suggested that opting out of setting a pin would prevent a user's data from being uploaded to the cloud, this is not the case. There is currently no way for a Signal user to prevent their data from being uploaded and stored in the cloud.<ref>{{Cite web |title=PSA: Disabling PINs will now upload nothing to the server |url=https://old.reddit.com/r/signal/comments/htmzrr/psa_disabling_pins_will_now_upload_nothing_to_the/ |archive-url=https://web.archive.org/web/20230616082821/https://old.reddit.com/r/signal/comments/htmzrr/psa_disabling_pins_will_now_upload_nothing_to_the/ |archive-date=06/16/23}}</ref>


'''Workarounds'''


While some social media posts and articles suggested that opting out of setting a pin would prevent a user's data from being uploaded to the cloud, this is not the case. <ref>{{Cite web |title=A few thoughts about Signal’s Secure Value Recovery |url=https://web.archive.org/web/20200712205333/https://blog.cryptographyengineering.com/2020/07/10/a-few-thoughts-about-signals-secure-value-recovery/}}</ref> When a Signal user sets a pin, their data is uploaded to the cloud and secured using SVR, however when a user chooses to "opt-out", a pin is automatically created for them instead, their data is encrypted and then uploaded to Signal's Storage Service. User who "opt-out" won't know the pin that was created for them, will not be able to use SVR to recover their profile and contact info on a new device, but the data is uploaded to the cloud regardless. There is currently no way for a Signal user to prevent their data from being uploaded and stored in the cloud.<ref name=":7">{{Cite web |title=PSA: Disabling PINs will now upload nothing to the server |url=https://old.reddit.com/r/signal/comments/htmzrr/psa_disabling_pins_will_now_upload_nothing_to_the/ |archive-url=https://web.archive.org/web/20230616082821/https://old.reddit.com/r/signal/comments/htmzrr/psa_disabling_pins_will_now_upload_nothing_to_the/ |archive-date=16 Jun 2023 |access-date=6 Mar 2025}}</ref>




==References==
==References==
{{reflist}}
{{reflist}}
 
[[Category:Signal messenger]]
{{Placeholder box|[[mw:Help:VisualEditor/User_guide#Editing_categories|Add a category]] with the same name as the product, service, website, software, product line or company that this article is about.
 
The "Incidents" category is not needed.}}
Retrieved from "https://consumerrights.wiki/Signal_data_collection"