Mobile App Security: What to Look For

We trust mobile apps with our most sensitive data—banking, passwords, health information, and private communications. But not all apps deserve that trust.

Why Mobile App Security Matters

Your phone knows everything about you:

• Financial accounts
• Personal communications
• Location history
• Health data
• Work information
• Authentication credentials

An insecure app accessing this data creates significant risk.

Security Features to Look For

Authentication

Good signs:

• Biometric authentication option
• Strong password requirements
• Account lockout after failed attempts
• Session timeout
• Multi-device management

Red flags:

• No password requirements
• Can’t log out
• No session management
• Stores passwords visibly

Data Protection

Good signs:

• End-to-end encryption mentioned
• Data encrypted at rest
• Sensitive data not visible in app preview
• No sensitive data in logs/screenshots

Red flags:

• Plain text data storage
• Sensitive data visible in background preview
• No encryption mentioned for sensitive features

Privacy Controls

Good signs:

• Minimal permission requests
• Clear explanation for each permission
• Ability to use app with limited permissions
• Data export option
• Account deletion option

Red flags:

• Excessive permission requests
• Won’t work without unnecessary permissions
• No privacy policy
• No way to delete data

Evaluating App Permissions

Android Permissions to Scrutinize

Permission	Legitimate Use	Suspicious If
Camera	Photo features	No photo feature
Microphone	Voice/video features	No audio feature
Location	Maps, local services	Unrelated app
Contacts	Social, communication	Calculator app
Storage	File management	Simple utility
Phone	Calling features	Non-communication app

iOS Permissions

iOS is generally more restrictive, but watch for:

• Location (always vs. when using)
• Photos
• Contacts
• Health data
• Background app refresh
• Notifications abuse

Researching App Security

Before Installing

Check the developer:

• Is it a known, reputable company?
• What other apps do they make?
• How long have they been around?
• Do they have a website with contact info?

Check reviews:

• Look for security-related complaints
• Check for reports of data breaches
• Read beyond the first few reviews
• Check external review sites

Check the privacy policy:

• Does one exist?
• Is it readable?
• What data is collected?
• Who is it shared with?
• Can you delete your data?

Signs of a Trustworthy App

The best indicator of app security is the company’s response to vulnerabilities. Companies that fix issues quickly and transparently are generally more trustworthy.

Positive indicators:

• Established company with reputation to protect
• Regular updates and security patches
• Bug bounty program
• Third-party security audits
• Transparent security practices
• Clear incident response history

Signs of Risk

Negative indicators:

• Unknown developer
• No updates in months/years
• Requests excessive permissions
• No privacy policy or vague policy
• Reports of security issues
• Too-good-to-be-true promises

Specific App Categories

Password Managers

Essential features:

• Zero-knowledge architecture
• Strong master password enforcement
• Biometric unlock
• Secure notes
• Breach monitoring
• Export capability

Avoid if:

• Can recover your password (means they can access data)
• No 2FA option
• Cloud-only with no local encryption

Banking & Financial

Essential features:

• Biometric authentication
• Transaction alerts
• Session timeout
• Device binding
• Fraud detection

Avoid if:

• Weak authentication
• No logout option
• Can’t disable features

Communication Apps

Essential features:

• End-to-end encryption
• Disappearing messages option
• Screen capture prevention (optional)
• Contact verification

Avoid if:

• No encryption or only “in transit”
• Stores messages in accessible cloud
• No security settings

Health & Medical

Essential features:

• Strong authentication
• HIPAA compliance (US)
• Data encryption
• Audit logging
• Limited sharing

Avoid if:

• Vague about data handling
• Shares with third parties
• No compliance certifications

Device-Level Protection

Even secure apps need a secure device:

iOS Security

• Keep iOS updated
• Enable Face ID/Touch ID
• Use strong passcode (6+ digits or alphanumeric)
• Review app permissions regularly
• Enable Find My iPhone
• Consider Screen Time for sensitive apps

Android Security

• Use phones with regular security updates
• Keep OS updated
• Enable biometric authentication
• Review app permissions
• Enable Find My Device
• Consider work profile for sensitive apps

When Things Go Wrong

If You Suspect an App is Compromised

If an App You Use is Breached

1. Change password for that service
2. Change passwords if you reused them elsewhere
3. Enable 2FA if not already active
4. Monitor for unauthorized activity
5. Consider credit monitoring if financial data exposed
6. Review what data the app had access to

App Security Checklist

Before trusting an app with sensitive data:

• Reputable developer
• Clear privacy policy
• Reasonable permission requests
• Encryption mentioned
• Biometric authentication available
• Regular updates
• Positive security reputation
• Ability to delete account/data

Conclusion

Mobile apps are integral to modern life, but not all deserve access to our sensitive information. Taking a few minutes to evaluate app security before installing—and periodically reviewing apps you’ve already installed—significantly reduces your risk.

Remember: free apps often monetize your data. If security and privacy matter, consider paid alternatives from established companies with reputations to protect.