Quick Read · mDL

Are mDLs Secure and Private?

Mobile driver's licenses (mDLs) are designed to be more secure and privacy-preserving than physical driver's licenses when implemented correctly.

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Overview

Cryptography, device security, and selective sharing

mDLs rely on cryptography, device security, and selective data sharing to protect both identity information and the holder's privacy.

Stronger security

Harder to lose, copy, or forge

Physical driver's licenses can be lost, copied, or forged. An mDL reduces these risks through cryptographic protection.

Authenticity

DMV digital signature

Each credential contains a digital signature from the issuing DMV. If the data is modified, the signature breaks and the credential fails verification.

Device binding

Tamper-resistant hardware

The credential is bound to the user's device, with cryptographic keys stored in tamper-resistant hardware — it cannot be copied to another device.

Privacy by design

Share only what's needed

mDL systems support selective disclosure, meaning the holder can share only the information required for a specific interaction.

Example

Prove age over 21

A holder can confirm they are over 21 without revealing their exact birth date, home address, or any other license data.

Why it matters

Less exposure by default

Showing a physical license exposes all data on the card. Selective disclosure limits what is shared to only what the verifier actually needs.

No central tracking

Verified locally, not centrally

Well-designed mDL systems verify credentials locally using digital signatures, so the issuing DMV does not need to be contacted every time the credential is presented.

Offline verification

Because verification relies on the issuer's digital signature rather than a live database lookup, credentials can be checked without phoning home — helping prevent systems that could track where or when a person uses their ID.

Summary

Secure and privacy-preserving by design

mDLs improve on physical IDs across every dimension that matters for security and privacy.

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In short
Mobile driver's licenses combine cryptographic signatures, device security, and selective disclosure to provide identity verification that is both more secure and more privacy-preserving than traditional physical IDs.