We send hundreds of messages daily - personal, work-related, financial. Which messenger should you trust with this information? Let’s analyze the key security aspects of popular applications.
What Is End-to-End Encryption
E2E Principle
End-to-end encryption (E2E) means the message is encrypted on your device and decrypted only on the recipient’s device:
You Server Recipient
[Message] → [Encrypted] → [Decrypted]
Key with you Cannot read Key with them
Nobody in between - not the messenger’s server, not your ISP, not hackers - can read the content.
Without E2E
If there’s no encryption or only server-side encryption:
You Server Recipient
[Message] → [Reads everything] → [Message]
The server sees all messages. If it’s hacked or accessed by request - your conversation is compromised.
Messenger Comparison
Signal
Encryption: E2E by default for all chats and calls.
Protocol: Signal Protocol - the gold standard of cryptography, used by other messengers too.
| Aspect | Rating |
|---|---|
| Message encryption | ★★★★★ |
| Call encryption | ★★★★★ |
| Minimal metadata | ★★★★★ |
| Convenience | ★★★★☆ |
| Popularity | ★★☆☆☆ |
Pros:
- Minimal data collection (only phone number)
- Open source code
- Non-profit organization
- Disappearing messages
- Screen protection from screenshots
Cons:
- Fewer users than competitors
- Phone number required for registration
- No cloud backup (this is both pro and con)
Recommendation: Best choice for confidential conversations.
Telegram
Encryption: E2E only in “secret chats”. Regular chats - server-side encryption only.
Protocol: MTProto - proprietary protocol, criticized by cryptographers for non-standard solutions.
| Aspect | Rating |
|---|---|
| Encryption (secret chats) | ★★★★☆ |
| Encryption (regular chats) | ★★☆☆☆ |
| Minimal metadata | ★★☆☆☆ |
| Convenience | ★★★★★ |
| Popularity | ★★★★★ |
Pros:
- Large groups and channels
- Bots and mini-apps
- Fast sync between devices
- Large file transfers
- Username-based (no phone number needed)
Cons:
- E2E must be enabled manually for each chat
- Secret chats don’t sync between devices
- Collects metadata
- Closed server code
Recommendation: Convenient for public channels and groups, but for private conversations - enable secret chats.
Encryption: E2E by default (based on Signal Protocol).
Owner: Meta (Facebook) - this affects data policy.
| Aspect | Rating |
|---|---|
| Message encryption | ★★★★★ |
| Call encryption | ★★★★★ |
| Minimal metadata | ★★☆☆☆ |
| Convenience | ★★★★★ |
| Popularity | ★★★★★ |
Pros:
- E2E by default
- Billions of users
- Simple interface
- Status and stories
- Business features
Cons:
- Collects metadata (who, when, how often)
- Shares data with Meta
- Closed source code
- Cloud backups not E2E encrypted by default
Recommendation: Good for connecting with those who don’t use Signal, but remember about metadata.
iMessage
Encryption: E2E between Apple devices.
| Aspect | Rating |
|---|---|
| Encryption (Apple↔Apple) | ★★★★★ |
| Encryption (with Android) | ☆☆☆☆☆ |
| Minimal metadata | ★★★☆☆ |
| Convenience | ★★★★★ |
| Ecosystem | Apple only |
Pros:
- smooth iOS/macOS integration
- iCloud backup with E2E (Advanced Data Protection)
- No ads
Cons:
- Works only between Apple devices
- Messages to Android - regular SMS (no encryption)
- Closed source
Comparison Table
| Messenger | E2E by default | Code | Metadata | Recommendation |
|---|---|---|---|---|
| Signal | Yes | Open | Minimal | For privacy |
| Telegram | No (manual) | Partial | Lots | For convenience |
| Yes | Closed | Lots | For reach | |
| iMessage | Yes (Apple) | Closed | Medium | For Apple ecosystem |
What Is Metadata
Why It Matters More Than Content
Metadata is “data about data”:
- Who you communicate with
- When and how often
- How long the conversation lasted
- Where you were located
- What device you used
Example: Even without reading messages, one can learn:
- You called an oncologist at 3 AM
- Then called relatives
- Then searched for will information
Content is encrypted, but metadata told the story.
Who Collects Metadata
| Messenger | What it collects |
|---|---|
| Signal | Only registration date and last connection |
| Telegram | Contacts, IP, devices, geolocation |
| Contacts, devices, communication frequency, geolocation |
Security Settings
Signal
- Disappearing messages: Settings → Privacy → Disappearing messages → Choose time
- Screen lock: Settings → Privacy → Screen lock
- Hide previews: Settings → Privacy → Show previews → Off
- Verify keys: In chat → Security settings → Verify safety number
Telegram
- Secret chat: Contact profile → ⋮ → Start secret chat
- Two-factor authentication: Settings → Privacy → Two-step verification
- Auto-delete: Settings → Privacy → Auto-delete messages
- Hide phone: Settings → Privacy → Phone number → Nobody
- Encrypted backup: Settings → Chats → Chat backup → E2E encrypted
- Disappearing messages: Settings → Privacy → Disappearing messages
- Fingerprint lock: Settings → Privacy → Fingerprint lock
- Two-step verification: Settings → Account → Two-step verification
VPN and Messengers
Why You Need VPN
VPN complements messenger protection:
| What messenger protects | What VPN protects |
|---|---|
| Message content | IP address and location |
| - | The fact you’re using the messenger |
| - | Traffic from ISP |
Scenario: You’re in a cafe, connecting to WiFi. Without VPN, the network admin sees you’re using Telegram. With VPN - they see only encrypted traffic.
When VPN Is Critical
- Public WiFi networks
- Corporate networks with monitoring
- Countries with messenger restrictions
- When hiding messenger usage matters
Secure Practices
Basic Rules
- Verify contacts: messenger phishing is growing
- Don’t click links: even from friends (account could be compromised)
- Enable 2FA: on all messengers
- Don’t store sensitive data: even in secure chats
- Update apps: vulnerabilities are fixed in patches
How exactly protecting the account with a second factor works, and why it’s worth turning on even with a strong password, is a separate topic.
What Not to Send
Even in E2E chats:
- Passwords and bank card details
- Document scans (passport, license)
- Medical records
- Compromising content
Why: Recipient’s device could be compromised, screenshots are possible, conversation might end up in cloud backup.
Alternative Messengers
For Maximum Privacy
| Messenger | Features |
|---|---|
| Session | No phone number, decentralized |
| Briar | P2P, works through Tor, Bluetooth without internet |
| Wickr | Auto-delete, anonymous registration |
| Element (Matrix) | Federated protocol, open source |
For Business
| Messenger | Features |
|---|---|
| Slack | Integrations, but no E2E |
| Microsoft Teams | Corporate, partial E2E |
| Wire | E2E by default, business features |
Security Checklist
Basic Level
- 2FA enabled on all messengers
- App lock enabled
- Auto-delete old messages configured
- Lock screen message previews disabled
Advanced Level
- Signal for important conversations
- Secret chats in Telegram
- E2E backups in WhatsApp
- VPN on public networks
Paranoid Level
- Session or Briar for anonymity
- Separate phone for sensitive communications
- Regular encryption key verification
- 24-hour auto-delete
Summary
There’s no perfect messenger - each balances privacy, convenience, and reach.
Recommendation:
- Signal for important conversations
- Telegram for convenience (with secret chats for private)
- WhatsApp for connecting with those who have nothing else
Combined with VPN, you protect both conversation content and the fact of messenger usage.
A messenger is only part of account protection; baseline account hygiene covers the rest: passwords, updates, everyday habits online.
If this leaves you wanting a reliable VPN, Tainet connects through the Telegram bot or in your account - from $0.10 a day, no config files, and support is real people.
