diff --git a/app/build.gradle b/app/build.gradle
index d4203333..7619615e 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -83,7 +83,7 @@ dependencies {
 	implementation 'androidx.camera:camera-view:1.4.2'
 	implementation 'com.github.markusfisch:ScalingImageView:1.4.3'
 	implementation 'com.github.markusfisch:zxing-cpp:v3.0.2.3'
-	implementation 'de.tsenger:vdstools:0.14.0'
+	implementation 'de.tsenger:vdstools:0.16.0-SNAPSHOT'
 	implementation 'org.bouncycastle:bcpkix-jdk15to18:1.83'
 
 	// Testing
diff --git a/app/src/main/kotlin/de/markusfisch/android/binaryeye/content/IdbVerifier.kt b/app/src/main/kotlin/de/markusfisch/android/binaryeye/content/IdbVerifier.kt
index df4c28a8..d1a255bf 100644
--- a/app/src/main/kotlin/de/markusfisch/android/binaryeye/content/IdbVerifier.kt
+++ b/app/src/main/kotlin/de/markusfisch/android/binaryeye/content/IdbVerifier.kt
@@ -17,10 +17,7 @@ import org.bouncycastle.jce.provider.BouncyCastleProvider
 import java.security.Provider
 import java.security.Security
 import java.security.cert.X509Certificate
-import java.text.SimpleDateFormat
 import java.util.Date
-import java.util.Locale
-import java.util.TimeZone
 
 object IdbVerifier {
 	private const val MASTER_LIST_ASSET = "DE_ML_2026-01-08-12-20-54.ml"
@@ -44,32 +41,25 @@ object IdbVerifier {
 					context.getString(R.string.idb_verification_unsigned)
 				)
 			)
-		val headerCertificateReference = seal.payLoad.idbHeader.certificateReference
-		val embeddedSignerCertificate = seal.payLoad.idbSignerCertificate
-			?.certBytes
-			?.let {
-				parseCertificate(it)
-			}
-		if (seal.payLoad.idbSignerCertificate != null && embeddedSignerCertificate == null) {
-			return listOf(
-				SealField(
-					R.string.idb_verification,
-					context.getString(
-						R.string.idb_verification_invalid_signer_certificate
-					)
-				)
-			)
-		}
-		val signerCertificate = embeddedSignerCertificate
-			?: context.findCertificateByReference(headerCertificateReference)
+		val headerCertificateReference = seal.signerCertReference
+			?.hexToByteArrayOrNull()
+		val signerCertificate = context.findCertificateByReference(
+			headerCertificateReference
+		)
 		val curveName = signerCertificate?.let {
 			curveNameFrom(it)
 		}
-		val signatureResult = if (signerCertificate == null || curveName.isNullOrBlank()) {
+		val signedBytes = seal.signedBytes
+		val signatureResult = if (
+			signerCertificate == null ||
+			curveName.isNullOrBlank() ||
+			signedBytes == null
+		) {
 			Verifier.Result.VerifyError
 		} else {
 			Verifier(
-				seal,
+				signedBytes,
+				signatureInfo.plainSignatureBytes,
 				signerCertificate.publicKey.encoded,
 				curveName
 			).verify()
@@ -113,9 +103,7 @@ object IdbVerifier {
 			),
 			SealField(
 				R.string.vds_signing_date,
-				parseSigningDate(
-					signatureInfo.signingDate.toString()
-				).toString()
+				signatureInfo.signingDate.toString()
 			),
 			SealField(
 				R.string.idb_signature_verification,
@@ -139,12 +127,14 @@ object IdbVerifier {
 		return fields
 	}
 
-	private fun parseSigningDate(value: String): Date? {
+	private fun String.hexToByteArrayOrNull(): ByteArray? {
+		if (length % 2 != 0) {
+			return null
+		}
 		return runCatching {
-			SimpleDateFormat("yyyy-MM-dd", Locale.US).apply {
-				isLenient = false
-				timeZone = TimeZone.getTimeZone("UTC")
-			}.parse(value)
+			ByteArray(length / 2) { index ->
+				substring(index * 2, index * 2 + 2).toInt(16).toByte()
+			}
 		}.getOrNull()
 	}
 
@@ -172,14 +162,6 @@ object IdbVerifier {
 		}
 	}
 
-	private fun parseCertificate(certificateBytes: ByteArray): X509Certificate? {
-		return runCatching {
-			JcaX509CertificateConverter()
-				.setProvider(provider)
-				.getCertificate(X509CertificateHolder(certificateBytes))
-		}.getOrNull()
-	}
-
 	private fun Context.findCertificateByReference(
 		certificateReference: ByteArray?
 	): X509Certificate? {
diff --git a/app/src/main/kotlin/de/markusfisch/android/binaryeye/content/IdlParser.kt b/app/src/main/kotlin/de/markusfisch/android/binaryeye/content/IdlParser.kt
index 3e6ae4f8..e824bc44 100644
--- a/app/src/main/kotlin/de/markusfisch/android/binaryeye/content/IdlParser.kt
+++ b/app/src/main/kotlin/de/markusfisch/android/binaryeye/content/IdlParser.kt
@@ -109,8 +109,9 @@ object IdlParser {
 			// Detect this by checking that the marker matches the key prefix
 			// (jurisdiction fields always share their 2-char subfile prefix).
 			val seg = if (skipSubtype && p - start >= 4 &&
-					data[start] == data[start + 2] &&
-					data[start + 1] == data[start + 3]) {
+				data[start] == data[start + 2] &&
+				data[start + 1] == data[start + 3]
+			) {
 				start + 2
 			} else {
 				start
diff --git a/app/src/main/kotlin/de/markusfisch/android/binaryeye/content/SealParser.kt b/app/src/main/kotlin/de/markusfisch/android/binaryeye/content/SealParser.kt
index 1d602c9f..4bbb4e6b 100644
--- a/app/src/main/kotlin/de/markusfisch/android/binaryeye/content/SealParser.kt
+++ b/app/src/main/kotlin/de/markusfisch/android/binaryeye/content/SealParser.kt
@@ -2,7 +2,7 @@ package de.markusfisch.android.binaryeye.content
 
 import android.content.Context
 import de.markusfisch.android.binaryeye.R
-import de.tsenger.vdstools.DataEncoder
+import de.tsenger.vdstools.asn1.DerTlv
 import de.tsenger.vdstools.generic.Message
 import de.tsenger.vdstools.generic.MessageCoding
 import de.tsenger.vdstools.generic.MessageValue
@@ -10,6 +10,7 @@ import de.tsenger.vdstools.generic.Seal
 import de.tsenger.vdstools.idb.IdbSeal
 import org.json.JSONArray
 import org.json.JSONObject
+import de.tsenger.vdstools.generic.SealParser as VdsSealParser
 
 data class SealField(val name: Any, val value: String)
 private data class IdbChildMessageDefinition(
@@ -27,7 +28,7 @@ object SealParser {
 		bytes: ByteArray
 	): List<SealField>? = try {
 		context.buildFields(
-			Seal.fromString(bytes.toString(Charsets.ISO_8859_1))
+			VdsSealParser().parse(bytes.toString(Charsets.ISO_8859_1))
 		)
 	} catch (_: Exception) {
 		null
@@ -66,7 +67,7 @@ object SealParser {
 	private fun Message.childMessages(): List<Message> {
 		val childDefinitionsByTag = idbChildMessagesByName[name] ?: return emptyList()
 		return runCatching {
-			DataEncoder.parseDerTLvs(value.rawBytes).mapNotNull { derTlv ->
+			DerTlv.parseAll(value.rawBytes).mapNotNull { derTlv ->
 				val childTag = derTlv.tag.toInt() and 0xff
 				val childDefinition = childDefinitionsByTag[childTag]
 					?: return@mapNotNull null
diff --git a/settings.gradle b/settings.gradle
index 6487d7d0..dd8faf56 100644
--- a/settings.gradle
+++ b/settings.gradle
@@ -10,6 +10,10 @@ dependencyResolutionManagement {
 	repositories {
 		google()
 		mavenCentral()
+		maven {
+			name = 'Central Portal Snapshots'
+			url = uri('https://central.sonatype.com/repository/maven-snapshots/')
+		}
 		maven { url 'https://jitpack.io' }
 	}
 }