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。
[105] The threat of this attack might be mitigated by enabling Sign's Registration Lock feature, a type of two-component authentication that needs the person to enter a PIN to register the telephone number on a whole new machine.[146]
[152][153] In July 2017, researchers from RUB identified through A further analysis of group messengers a purely theoretic attack in opposition to the group protocol of Signal: A consumer who is familiar with The trick team ID of a gaggle (due to getting been a group member previously or stealing it from a member's gadget) can become a member in the group. Because the group ID can't be guessed and this sort of member alterations are displayed to the remaining associates, this attack is likely to become hard to carry out with out becoming detected.[154]
In keeping with John Ratcliffe, as of 2025 Signal is mounted by default within the gadgets of most CIA workers and its usage is roofed by common onboarding instruction.[111]
Sign's app icon could possibly be changed with various colour themes for customization and to cover the application. The application title will also be personalized.[132] Messages might have effects like spoilers and italics, and consumers can increase each other through QR code.[133]
On nine August 2022, Ismail Sabri Yaakob, the Prime Minister of Malaysia, documented that his Sign account was "hacked" and infiltrated by a 3rd party, sending out messages and impersonating the politician. No particulars ended up disclosed concerning the technique accustomed to attain access to the account.[215]
On four October 2016, the American Civil Liberties Union (ACLU) and Open Whisper Methods published a series of files revealing that OWS experienced gained a subpoena necessitating them to supply details connected with two cellphone numbers for a federal grand jury investigation in the first 50 % of 2016.[eighty two][83][84] Only on the list of two cell phone figures was registered on Signal, and since of how the assistance is made, OWS was only capable to provide "some time the consumer's account had been created and the final time it had connected to the assistance".
Signal demands which the consumer supply a phone variety for verification,[141] removing the need for consumer names or passwords and facilitating Make contact with discovery (see below).[142] The range does not have to be similar to around the machine's SIM card; it may also be a VoIP number[141] or maybe a landline provided that the user can get the verification code and have a independent unit to set up the software package.
Right up until 2023, Android buyers could opt into generating Sign the default SMS/MMS application, making it possible for them to mail and obtain unencrypted SMS messages Besides the standard stop-to-conclude encrypted Sign messages.
This necessary link to your phone range (a aspect Signal中文版 Sign shares with WhatsApp, KakaoTalk, and others) continues to be criticized as being a "main concern" for privacy-aware consumers who're not cozy with providing out their private quantity.
One of many things that I was briefed on very early, senator, was by the CIA documents administration people about the use of Signal to be a permissible do the job use," Ratcliffe claimed. ^
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 Signal is utilized to fund terrorist or legal things to do may be the justification for Turkey to criminalize the application for the general populace, which Abdullah Bozkurt claims is a means the "governing administration abuses its counterterrorism legal guidelines to punish critics, opponents and dissidents."[243][244]
Sign utilizes cellular phone numbers to sign up and manage consumer accounts, nevertheless configurable usernames had been extra in March 2024 to permit customers to cover their cellular phone numbers from other end users.