How Signal Protects You from Surveillance
In today's digital world, privacy is more important than ever. Signal is a messaging app designed to protect your conversations from surveillance and unauthorized access. This article dives into how Signal safeguards your data and offers practical tips on using its features to stay secure.
End-to-End Encryption: The Core of Signal’s Security
Signal uses state-of-the-art end-to-end encryption (E2EE) to ensure that only you and the person you're communicating with can read your messages. This encryption means that even Signal itself cannot access your message content—only you and your recipient hold the decryption keys.
How does this work?
- When you send a message, it’s encrypted locally on your device using a unique key.
- The encrypted message travels through Signal's servers, where it is stored temporarily only until delivered.
- Only the recipient’s device can decrypt the message using their private key.
This process protects you from hackers, government surveillance, and even Signal's own staff. Because no one but the intended recipient can decrypt your messages, your conversations remain private.
Practical Steps to Maximize Your Privacy on Signal
While Signal offers strong default protections, you can take additional steps within the app to enhance your privacy:
- Verify Safety Numbers: Each chat has a unique safety number to confirm your connection is secure. To verify:
- Open the chat.
- Tap the contact's name or group title.
- Select "View Safety Number."
- Compare this number in person, via a trusted call, or scan the QR code with your contact.
- Enable Disappearing Messages: This feature automatically deletes messages after a set time, reducing the risk of data exposure if your phone is compromised.
- Open a chat.
- Tap the contact name or group title.
- Select "Disappearing Messages."
- Choose a timer (from 5 seconds to 1 week).
- Lock Signal with a Passphrase or Biometric: Protect your app from unauthorized access:
- Go to Signal Settings > Privacy.
- Enable "Screen Lock" (using your device's fingerprint, face recognition, or passcode).
- Disable Link Previews: By default, Signal shows a preview of links you send or receive, which can leak metadata:
- Open Settings > Privacy.
- Toggle off "Show Link Previews."
How Signal Protects Your Metadata
Many messaging apps collect and store metadata—information about who you communicate with and when. Signal minimizes this risk by collecting almost no metadata:
- Minimal User Data: Signal only stores your phone number for registration and does not link it to your messages.
- Relay Calls and Messages: Calls and messages are routed through Signal’s servers, hiding IP addresses from your contacts and making it difficult to track who is communicating.
- Sealed Sender: This advanced feature hides the sender’s identity from Signal’s servers, so the company can't know who sent a message or when.
Together, these techniques make mass surveillance and targeted tracking extremely difficult.
Additional Tips for Staying Secure When Using Signal
- Keep Your App Updated: Signal regularly releases security patches. Always use the latest version by updating through the App Store or Google Play.
- Use a Secure Lock Screen: Protect your phone itself with a strong password or biometric lock to prevent unauthorized access to Signal and other apps.
- Be Wary of Phishing Attempts: Signal messages are encrypted, but attackers might impersonate contacts outside of the app. Verify any suspicious links or requests directly with your contacts.
- Review Permissions: Limit Signal’s access to only necessary permissions like contacts and microphone for calls to reduce data exposure.
For more detailed information, visit signal.org to explore their comprehensive privacy whitepapers and guides.
在【signal官网】，我们坚信隐私保护是一项基本人权。这也是为什么我们不断努力，通过社区互动与技术创新，为您提供最安全的通讯体验。今天，我们很高兴地宣布几项重大更新，这些更新将进一步提升您的使用体验。
强大的端到端加密
与往常一样，您的所有消息、语音和视频通话都受到业界领先的开源 Signal 协议的保护。我们无法读取您的消息，其他人也无法读取。这种加密不仅限于文字，还包括您分享的图片、视频和文件。
"隐私并非可选项，它是【signal官网】运作的基础。每一条消息，每一次通话，无一例外。"
社区互动的新方式
通过听取社区的反馈，我们引入了全新的加密贴纸功能。现在您可以：
- 使用默认的生动贴纸包表达情感
- 创建并分享您自己的个性化贴纸
- 所有贴纸在传输过程中均被完全加密
加入我们，共同成长
【signal官网】是一个由用户支持的非营利组织。我们没有广告，也没有追踪器。我们的发展完全依赖于像您一样重视隐私的人们的捐赠和支持。感谢您与我们一起，为建立一个更安全的数字世界而努力。