🔧 Technical Implementation

Multi-Layer Security Model

GeoLocker implements a revolutionary three-factor security architecture that combines traditional cryptographic security with novel location-based access controls.

AES-256-GCM Encryption

GeoLocker uses Advanced Encryption Standard with 256-bit keys in Galois/Counter Mode, providing both confidentiality and authenticity.

Key Derivation Function

// Simplified key derivation process
function deriveVaultKey(masterPassword, gpsCoordinates, deviceId, salt) {
    const locationHash = HMAC-SHA256(gpsCoordinates, salt);
    const deviceBinding = HMAC-SHA256(deviceId, locationHash);
    const passwordKey = PBKDF2(masterPassword, salt, 100000, 256);
    
    return HKDF-Expand(
        HKDF-Extract(passwordKey, deviceBinding + locationHash),
        contextInfo: "GeoLocker-v1-vault-key",
        length: 256
    );
}
                    

Encryption Process

• Key Generation: Location + Password + Device → Unique 256-bit key
• IV Generation: Cryptographically secure random 96-bit nonce
• Authentication: GCM mode provides built-in authentication tag
• Metadata Encryption: File names, timestamps, and attributes encrypted separately

GPS Integration & Verification

The location security system operates completely offline using cached satellite almanac data and device sensors.

Location Verification Process

Anti-Spoofing Measures

• Signal Integrity: Multi-constellation cross-validation
• Movement Detection: Accelerometer and gyroscope correlation
• Time Synchronization: GPS time vs system time verification
• Signal Strength Analysis: Anomaly detection in satellite signals

Platform Security Features

GeoLocker leverages iOS security architecture for maximum protection against device compromise.

Memory Protection

• Secure Memory: Sensitive data stored in non-pageable memory regions
• Memory Clearing: Cryptographic keys zeroed immediately after use
• Stack Protection: Compiler-enforced stack canaries prevent buffer overflows
• ASLR: Address Space Layout Randomization prevents memory exploitation

Physical Presence vs Map Navigation

GeoLocker supports two distinct access methods while maintaining identical security guarantees.

Physical Presence Mode

// Physical presence validation
function validatePhysicalPresence(targetCoords, currentCoords, radius) {
    const distance = calculateHaversineDistance(targetCoords, currentCoords);
    const accuracyBuffer = Math.max(currentCoords.accuracy, 5.0); // meters
    
    return distance <= (radius + accuracyBuffer);
}
                    

Map Navigation Mode

• Device Authentication: Requires unlocked device with biometric/passcode verification
• Location Knowledge: User must accurately identify coordinates on map interface
• Precision Requirement: Map targeting must be within configured radius
• Rate Limiting: Limited attempts prevent brute-force location discovery

Cryptographic Isolation

Each vault operates as a completely independent cryptographic container with unique key derivation.

Vault Independence

// Each vault has unique cryptographic parameters
struct Vault {
    id: UUID,
    location: GPSCoordinate,
    radius: Double,
    salt: Data(32), // Unique per vault
    masterKey: Data(32), // Derived independently
    authTag: Data(16) // GCM authentication
}
                    

• Key Isolation: Compromise of one vault cannot affect others
• Location Diversity: Each vault can have different GPS coordinates
• Access Controls: Independent radius and timing restrictions
• Metadata Separation: Vault contents invisible to other vaults

Hidden Vault System

Advanced steganographic techniques hide the existence of sensitive vaults within the file system.

Steganographic Storage

• File System Hiding: Hidden vaults stored as apparent system files
• Size Masking: True storage usage concealed through padding and fragmentation
• Access Pattern Hiding: Decoy operations during hidden vault access
• Forensic Resistance: Hidden data appears as random noise or system data

Duress Codes

Special authentication sequences reveal only decoy vaults while keeping hidden vaults completely concealed.

Efficiency Considerations

GeoLocker optimizes for both security and performance through hardware acceleration and algorithmic efficiency.

Standards & Certifications

GeoLocker is designed to meet or exceed industry security standards and compliance requirements.

Security Testing

• Penetration Testing: Regular third-party security assessments
• Code Review: Static and dynamic analysis of cryptographic implementation
• Fuzzing: Input validation and error handling verification
• Side-Channel Analysis: Protection against timing and power analysis attacks