diff --git a/build.gradle b/build.gradle
index ca60b45..e2930c7 100644
--- a/build.gradle
+++ b/build.gradle
@@ -8,7 +8,7 @@ plugins {
 }
 
 ext {
-    transactIdCoreVersion = "2.0.0-beta1"
+    transactIdCoreVersion = "2.0.0-beta3"
     dokkaVersion = "0.9.17"
     protoVersion = "3.10.0"
     bouncyCastleVersion = "1.67"
@@ -21,7 +21,7 @@ ext {
     kotlinReflectVersion = "1.3.70"
 
     groupId = 'com.netki'
-    versionRelease = '2.0.0-beta1'
+    versionRelease = '2.0.0-beta3'
     artifactId = 'transactid'
 }
 
diff --git a/src/main/java/com/netki/keymanagement/service/impl/KeyManagementNetkiService.kt b/src/main/java/com/netki/keymanagement/service/impl/KeyManagementNetkiService.kt
index 3f6dea1..fa454a5 100644
--- a/src/main/java/com/netki/keymanagement/service/impl/KeyManagementNetkiService.kt
+++ b/src/main/java/com/netki/keymanagement/service/impl/KeyManagementNetkiService.kt
@@ -1,6 +1,7 @@
 package com.netki.keymanagement.service.impl
 
 import com.netki.exceptions.*
+import com.netki.exceptions.ExceptionInformation.CERTIFICATE_INFORMATION_STRING_NOT_CORRECT_ERROR_PROVIDER
 import com.netki.exceptions.ExceptionInformation.KEY_MANAGEMENT_CERTIFICATE_INVALID_EXCEPTION
 import com.netki.exceptions.ExceptionInformation.KEY_MANAGEMENT_ERROR_FETCHING_CERTIFICATE
 import com.netki.exceptions.ExceptionInformation.KEY_MANAGEMENT_ERROR_FETCHING_CERTIFICATE_NOT_FOUND
@@ -9,13 +10,14 @@ import com.netki.exceptions.ExceptionInformation.KEY_MANAGEMENT_ERROR_FETCHING_P
 import com.netki.exceptions.ExceptionInformation.KEY_MANAGEMENT_ERROR_STORING_CERTIFICATE
 import com.netki.exceptions.ExceptionInformation.KEY_MANAGEMENT_ERROR_STORING_PRIVATE_KEY
 import com.netki.exceptions.ExceptionInformation.KEY_MANAGEMENT_PRIVATE_KEY_INVALID_EXCEPTION
+import com.netki.extensions.isAlphaNumeric
 import com.netki.keygeneration.main.KeyGeneration
+import com.netki.keygeneration.util.toPrincipal
 import com.netki.keymanagement.driver.KeyManagementDriver
 import com.netki.keymanagement.service.KeyManagementService
+import com.netki.model.AttestationCertificate
 import com.netki.model.AttestationInformation
-import com.netki.security.toCertificate
-import com.netki.security.toPemFormat
-import com.netki.security.toPrivateKey
+import com.netki.security.*
 import java.security.PrivateKey
 import java.security.cert.X509Certificate
 import java.util.*
@@ -28,8 +30,35 @@ internal class KeyManagementNetkiService(
     /**
      * {@inheritDoc}
      */
-    override fun generateCertificates(attestationsInformation: List<AttestationInformation>) =
-        keyGeneration.generateCertificates(attestationsInformation)
+    override fun generateCertificates(attestationsInformation: List<AttestationInformation>): List<AttestationCertificate> {
+        validateAttestationData(attestationsInformation)
+
+        val keyPair = Keys.generateKeyPair()
+
+        val attestationsCertificate = attestationsInformation.map {
+            AttestationCertificate(
+                attestation = it.attestation,
+                csr = Certificate.csrObjectToPem(
+                    Certificate.generateCSR(it.attestation.toPrincipal(it.data, it.ivmsConstraint), keyPair)
+                ),
+                publicKeyPem = keyPair.public.toPemFormat()
+            )
+        }
+
+        val certificates = keyGeneration.generateCertificates(attestationsCertificate)
+
+        return if (certificates.count() == 0) {
+            emptyList()
+        } else {
+            certificates.map {
+                AttestationCertificate(
+                    it.attestation,
+                    it.certificatePem!!,
+                    keyPair.private.toPemFormat()
+                )
+            }
+        }
+    }
 
     /**
      * {@inheritDoc}
@@ -175,6 +204,19 @@ internal class KeyManagementNetkiService(
         } ?: throw ObjectNotFoundException(KEY_MANAGEMENT_ERROR_FETCHING_PRIVATE_KEY_NOT_FOUND.format(privateKeyId))
     }
 
-
     private fun generateUniqueId() = UUID.randomUUID().toString()
+
+    private fun validateAttestationData(attestationsInformation: List<AttestationInformation>) {
+        attestationsInformation.forEach { information ->
+            if (!information.data.isAlphaNumeric()) {
+                throw CertificateProviderException(
+                    String.format(
+                        CERTIFICATE_INFORMATION_STRING_NOT_CORRECT_ERROR_PROVIDER,
+                        information.data,
+                        information.attestation
+                    )
+                )
+            }
+        }
+    }
 }
diff --git a/src/test/java/com/netki/keymanagement/main/impl/KeyManagementNetkiTest.kt b/src/test/java/com/netki/keymanagement/main/impl/KeyManagementNetkiTest.kt
index b10199b..4ce885d 100644
--- a/src/test/java/com/netki/keymanagement/main/impl/KeyManagementNetkiTest.kt
+++ b/src/test/java/com/netki/keymanagement/main/impl/KeyManagementNetkiTest.kt
@@ -1,9 +1,13 @@
 package com.netki.keymanagement.main.impl
 
 import com.netki.exceptions.*
+import com.netki.exceptions.ExceptionInformation.CERTIFICATE_INFORMATION_STRING_NOT_CORRECT_ERROR_PROVIDER
 import com.netki.keygeneration.main.KeyGeneration
 import com.netki.keymanagement.driver.impl.VaultDriver
 import com.netki.keymanagement.service.impl.KeyManagementNetkiService
+import com.netki.model.Attestation
+import com.netki.model.AttestationInformation
+import com.netki.model.IvmsConstraint
 import com.netki.security.toCertificate
 import com.netki.security.toPrivateKey
 import com.netki.util.TestData
@@ -46,7 +50,7 @@ internal class KeyManagementNetkiTest {
 
         val idResult = keyManagement.storeCertificatePem(TestData.KeyPairs.CLIENT_CERTIFICATE_RANDOM)
 
-        assert(!idResult.isBlank())
+        assert(idResult.isNotBlank())
     }
 
     @Test
@@ -311,5 +315,29 @@ internal class KeyManagementNetkiTest {
 
         assert(exception.message != null && exception.message!!.contains("Private key not found for id"))
     }
+
+    @Test
+    fun `Generate certificate for attestations with invalid data`() {
+        val attestationInformation = AttestationInformation(
+            Attestation.LEGAL_PERSON_NAME,
+            IvmsConstraint.LEGL,
+            "This is invalid data #$#$#$"
+        )
+        val attestationInformationInvalid = listOf(attestationInformation)
+
+        val exception = assertThrows(CertificateProviderException::class.java) {
+            keyManagement.generateCertificates(attestationInformationInvalid)
+        }
+
+        assert(
+            exception.message != null && exception.message!!.contains(
+                String.format(
+                    CERTIFICATE_INFORMATION_STRING_NOT_CORRECT_ERROR_PROVIDER,
+                    attestationInformation.data,
+                    attestationInformation.attestation
+                )
+            )
+        )
+    }
 }