Mobile Security

What I do

• Secure mobile applications against common vulnerabilities
• Implement secure data storage and encryption
• Protect against reverse engineering and tampering
• Secure network communications
• Implement authentication and authorization
• Handle sensitive data properly
• Conduct security assessments for mobile apps

When to use me

Use me when:

• Building mobile apps with sensitive user data
• Apps requiring secure payment handling
• Enterprise apps with corporate data
• Apps subject to security compliance (HIPAA, PCI-DSS)
• Implementing biometric authentication
• Preparing security audit documentation

Key Concepts

OWASP Mobile Top 10

Critical mobile security risks:

1. Improper Credential Usage
2. Inadequate Supply Chain Security
3. Insecure Authentication/Authorization
4. Insufficient Input/Output Validation
5. Insecure Communication
6. Inadequate Privacy Controls
7. Insufficient Binary Protections
8. Security Misconfiguration
9. Insecure Data Storage
10. Insufficient Cryptography

Secure Data Storage

Android (EncryptedSharedPreferences):

val masterKey = MasterKey.Builder(context)
    .setKeyScheme(MasterKey.KeyScheme.AES256_GCM)
    .build()

val securePrefs = EncryptedSharedPreferences.create(
    context,
    "secure_prefs",
    masterKey,
    EncryptedSharedPreferences.PrefKeyEncryptionScheme.AES256_SIV,
    EncryptedSharedPreferences.PrefValueEncryptionScheme.AES256_GCM
)

securePrefs.edit().putString("token", authToken).apply()

iOS (Keychain):

let query: [String: Any] = [
    kSecClass: kSecClassGenericPassword,
    kSecAttrService: "com.app.service",
    kSecAttrAccount: "authToken",
    kSecValueData: token.data(using: .utf8)!
]

SecItemAdd(query as CFDictionary, nil)

Code Obfuscation

• Android: ProGuard, R8, DexGuard
• iOS: LLVM obfuscation, symbol stripping

Network Security

• TLS 1.3 minimum
• Certificate pinning
• No sensitive data in URLs
• Secure WebViews configuration