点按 新增标签，建立新的标签名称与新增成员，或于新增成员中，将朋友加入已设定的标签内。

The servers shop registered buyers' cellular phone figures, public critical content and push tokens which happen to be needed for establishing phone calls and transmitting messages.[174] In an effort to determine which contacts are Signal buyers, cryptographic hashes on the user's Get hold of numbers are periodically transmitted on the server.[one hundred seventy five] The server then checks to determine if those match any with the SHA-256 hashes of registered end users and tells the consumer if any matches are found.[a hundred seventy five] The hashed numbers are thereafter discarded from the server.[174] In 2014, Moxie Marlinspike wrote that it's simple to work out a map of all attainable hash inputs to hash outputs and reverse the mapping due to the limited preimage Area (the list of all achievable hash inputs) of cellular phone numbers, and that a "realistic privateness preserving Get in touch with discovery stays an unsolved trouble.

[152][153] In July 2017, researchers from RUB discovered in the course of One more Investigation of team messengers a purely theoretic assault versus the team protocol of Sign: A user who knows The trick group ID of a gaggle (on account of getting been a gaggle member Formerly or thieving it from a member's device) could become a member from the team. Because the team ID cannot be guessed and this sort of member variations are displayed to the remaining users, this attack is probably going to become tricky to carry out devoid of becoming detected.[154]

TextSecure allowed the consumer to established a passphrase that encrypted the nearby concept databases and also the consumer's encryption keys.[127] This didn't encrypt the person's Make contact with databases or information timestamps.[127] The Signal programs on Android and iOS might be locked While using the cellphone's pin, passphrase, or biometric authentication.

Signal's application icon could be improved with various colour themes for customization and to hide the application. The application title can also be tailored.[132] Messages might have results like spoilers and italics, and buyers can include one another via QR code.[133]

On 9 August 2022, Ismail Sabri Yaakob, the Key Minister of Malaysia, reported that his Signal account was "hacked" and infiltrated by a third party, sending out messages and impersonating the politician. No aspects had been disclosed concerning the method accustomed to get access to the account.[215]

Signal's terms of services states that the solution might not be accustomed to violate the legislation.[237] In line with a previous personnel, Sign's leadership at enough time advised him they'd say anything "if and when persons start out abusing Sign or undertaking things which we predict are horrible".

I at last acquired the prospect to go through all this a lot more thoroughly, and it appears that evidently all Cellebrite is executing is looking at the texts off of the cellphone they're able to presently access. To [sic] this has absolutely nothing to do with Sign in the least. So: never ever thoughts.

A 12 months afterwards, within the runup to an eventually scarcely attended sequel to Unite the Right in D.C., organizers appeared to stay off the System, opting in its place to discuss logistics above Fb Messenger plus the encrypted texting application Signal. ^

创建安全群组，与朋友、家人和同事保持联系，同时享有所有隐私功能�?高级隐私功能

Applying cellular phone quantities as identifiers may make protection pitfalls that occur from the potential for an attacker taking up a telephone number.[142] A similar vulnerability was used to assault no less than just one consumer in August 2022, even though the attack was executed by means of the company of Signal's SMS solutions, not any person's company.

端到端加密：所有消息、语音、文件传输都经过加密，确保第三方无法读取。

The claim that Sign is used to here fund terrorist or felony activities could be the justification for Turkey to criminalize the app for the overall inhabitants, which Abdullah Bozkurt claims is a method the "government abuses its counterterrorism rules to punish critics, opponents and dissidents."[243][244]

Signal employs cell telephone figures to sign up and handle consumer accounts, nevertheless configurable usernames have been included in March 2024 to allow consumers to cover their phone figures from other people.