Why Signal Is the Gold Standard for Private Messaging
Signal is an open-source, end-to-end encrypted messaging application developed by the Signal Foundation. It is widely regarded as the most secure mainstream messaging application available, used by security researchers, journalists, activists, and anyone who needs genuinely private communications.
What makes Signal exceptional:
- End-to-end encryption by default for all messages and calls
- Open-source protocol that has been independently audited
- Minimal metadata retention — Signal collects almost no information about its users
- Sealed sender technology that hides who is messaging whom even from Signal
- No advertising, no data selling, nonprofit ownership
Getting Started with Signal Safely
Download only from official sources
iOS: Apple App Store (search Signal) Android: Google Play Store (search Signal) Desktop: signal.org/download
Signal requires a phone number for registration. This is the primary limitation from a privacy perspective — your phone number is your identifier. For maximum anonymity, register with a VoIP number (Google Voice, a prepaid SIM).
Setting Up Signal for Maximum Privacy
Registration Lock
Settings > Account > Registration Lock Enable this. It requires your Signal PIN to register your number on a new device — prevents SIM swap attacks from being used to take over your Signal account.
Note to Self
Your "Note to Self" conversation syncs across Signal devices. Be aware of what you store there.
Profile Privacy
Settings > Privacy > Who can see my phone number Set to Nobody or My Contacts — prevents strangers from finding you by phone number.
Who Can Find Me
Settings > Privacy > Who can find me by number Same principle — limit to contacts or nobody.
Disappearing Messages
In any conversation, tap the contact name > Disappearing messages Set messages to auto-delete after a time period (from 30 seconds to 4 weeks). This prevents long-term message accumulation on both devices.
Screen Security
Settings > Privacy > Screen Lock: Enable Settings > Privacy > Screen Security: Enable (prevents Signal content appearing in app switcher)
Note Preview in Notifications
Settings > Notifications > Show: Set to No Name or Message to prevent message content appearing in notification previews on your lock screen.
Signal Features for Maximum Privacy
Safety Numbers
Each Signal contact has a Safety Number — a code you can verify with your contact in person or over a trusted channel. Verifying safety numbers confirms you are communicating with the real person, not an impersonator. Tap contact name > View Safety Number
View Once Media
Photos and videos sent as View Once disappear after the recipient views them once. No screenshot notification exists, but Signal prevents screenshots within View Once media.
Note Reactions and Read Receipts
Settings > Chats > Read Receipts — disable if you do not want contacts to see when you have read their messages.
What Signal Cannot Protect
Device compromise: If your phone is physically compromised or has malware, Signal conversations can be read directly from your device.
Recipient security: Signal encrypts in transit, but the recipient's device must also be secure.
Metadata on Apple/Google networks: While Signal uses minimal metadata, your phone's network activity (that you have the Signal app, when you use it) may be visible to mobile network operators and device manufacturers.
Screenshots: Recipients can still screenshot conversations.
Using Signal Registration with Temp90
Signal requires a phone number, not an email address, so Temp90 does not directly apply to Signal registration. However, services that integrate with Signal or that you access while using privacy-conscious practices benefit from the combined approach of Signal for messaging and Temp90 for email registrations.
Frequently Asked Questions
Is Signal safer than WhatsApp?
Signal uses the Signal Protocol, as does WhatsApp. However, Signal is significantly more privacy-respecting in metadata collection — WhatsApp collects substantial metadata about who you message, when, and how frequently. Signal explicitly minimizes this collection.
Can Signal messages be subpoenaed?
Signal has been subpoenaed and can produce only the phone number and account creation date — because that is all they store. Message content is encrypted and not stored on Signal's servers.
My contact uses WhatsApp, not Signal. Can I message them privately?
For contacts who do not use Signal, WhatsApp provides encrypted message content (using Signal Protocol) but poorer metadata privacy. For the most sensitive communications, encourage contacts to install Signal.
Conclusion
Signal represents the practical best available for private everyday messaging. Its end-to-end encryption, open-source protocol, minimal metadata, and privacy-by-default settings make it the right choice for sensitive communications. Setting it up correctly — Registration Lock, disappearing messages, limited profile visibility — maximizes the protection it provides.