diff --git a/app/src/main/kotlin/com/x8bit/bitwarden/data/auth/repository/AuthRepositoryImpl.kt b/app/src/main/kotlin/com/x8bit/bitwarden/data/auth/repository/AuthRepositoryImpl.kt
index 3bc1dff1b64..bd8df3cc04f 100644
--- a/app/src/main/kotlin/com/x8bit/bitwarden/data/auth/repository/AuthRepositoryImpl.kt
+++ b/app/src/main/kotlin/com/x8bit/bitwarden/data/auth/repository/AuthRepositoryImpl.kt
@@ -59,7 +59,7 @@ import com.x8bit.bitwarden.data.auth.datasource.disk.model.ForcePasswordResetRea
 import com.x8bit.bitwarden.data.auth.datasource.disk.model.OnboardingStatus
 import com.x8bit.bitwarden.data.auth.datasource.network.model.DeviceDataModel
 import com.x8bit.bitwarden.data.auth.datasource.sdk.AuthSdkSource
-import com.x8bit.bitwarden.data.auth.datasource.sdk.util.toKdfTypeJson
+import com.x8bit.bitwarden.data.auth.datasource.sdk.util.toKdfRequestModel
 import com.x8bit.bitwarden.data.auth.manager.AuthRequestManager
 import com.x8bit.bitwarden.data.auth.manager.AuthStateManager
 import com.x8bit.bitwarden.data.auth.manager.KdfManager
@@ -866,16 +866,16 @@ internal class AuthRepositoryImpl(
                 identityService.registerFinish(
                     body = RegisterFinishRequestJson(
                         email = email,
-                        masterPasswordHash = registerKeyResponse.masterPasswordHash,
-                        masterPasswordHint = masterPasswordHint,
                         emailVerificationToken = emailVerificationToken,
-                        userSymmetricKey = registerKeyResponse.encryptedUserKey,
+                        masterPasswordHint = masterPasswordHint,
                         userAsymmetricKeys = KeysJson(
                             publicKey = registerKeyResponse.keys.public,
                             encryptedPrivateKey = registerKeyResponse.keys.private,
                         ),
-                        kdfType = kdf.toKdfTypeJson(),
-                        kdfIterations = kdf.iterations,
+                        kdf = kdf.toKdfRequestModel(),
+                        salt = email,
+                        masterPasswordAuthenticationHash = registerKeyResponse.masterPasswordHash,
+                        masterKeyWrappedUserKey = registerKeyResponse.encryptedUserKey,
                     ),
                 )
             }
diff --git a/app/src/test/kotlin/com/x8bit/bitwarden/data/auth/repository/AuthRepositoryTest.kt b/app/src/test/kotlin/com/x8bit/bitwarden/data/auth/repository/AuthRepositoryTest.kt
index a28ffabc805..96054964d2f 100644
--- a/app/src/test/kotlin/com/x8bit/bitwarden/data/auth/repository/AuthRepositoryTest.kt
+++ b/app/src/test/kotlin/com/x8bit/bitwarden/data/auth/repository/AuthRepositoryTest.kt
@@ -4851,16 +4851,21 @@ class AuthRepositoryTest {
             identityService.registerFinish(
                 body = RegisterFinishRequestJson(
                     email = EMAIL,
-                    masterPasswordHash = PASSWORD_HASH,
-                    masterPasswordHint = null,
                     emailVerificationToken = EMAIL_VERIFICATION_TOKEN,
-                    userSymmetricKey = ENCRYPTED_USER_KEY,
+                    masterPasswordHint = null,
                     userAsymmetricKeys = KeysJson(
                         publicKey = PUBLIC_KEY,
                         encryptedPrivateKey = PRIVATE_KEY,
                     ),
-                    kdfType = KdfTypeJson.PBKDF2_SHA256,
-                    kdfIterations = DEFAULT_KDF_ITERATIONS.toUInt(),
+                    kdf = KdfJson(
+                        kdfType = KdfTypeJson.PBKDF2_SHA256,
+                        iterations = DEFAULT_KDF_ITERATIONS,
+                        memory = null,
+                        parallelism = null,
+                    ),
+                    salt = EMAIL,
+                    masterPasswordAuthenticationHash = PASSWORD_HASH,
+                    masterKeyWrappedUserKey = ENCRYPTED_USER_KEY,
                 ),
             )
         } returns RegisterResponseJson.Success.asSuccess()
diff --git a/network/src/main/kotlin/com/bitwarden/network/model/RegisterFinishRequestJson.kt b/network/src/main/kotlin/com/bitwarden/network/model/RegisterFinishRequestJson.kt
index a0f0660ef4d..d4d5946ecb9 100644
--- a/network/src/main/kotlin/com/bitwarden/network/model/RegisterFinishRequestJson.kt
+++ b/network/src/main/kotlin/com/bitwarden/network/model/RegisterFinishRequestJson.kt
@@ -6,14 +6,12 @@ import kotlinx.serialization.Serializable
 /**
  * Request body for register.
  *
- * @param email the email to be registered.
- * @param emailVerificationToken token used to finish the registration process.
- * @param masterPasswordHash the master password (encrypted).
- * @param masterPasswordHint the hint for the master password (nullable).
- * @param userSymmetricKey the user key for the request (encrypted).
- * @param userAsymmetricKeys a [KeysJson] object containing public and private keys.
- * @param kdfType the kdf type represented as an [Int].
- * @param kdfIterations the number of kdf iterations.
+ * @property email the email to be registered.
+ * @property emailVerificationToken token used to finish the registration process.
+ * @property masterPasswordHint the hint for the master password (nullable).
+ * @property userAsymmetricKeys a [KeysJson] object containing public and private keys.
+ * @property authenticationData The data to authenticate with a master password.
+ * @property unlockData The data to unlock with a master password.
  */
 @Serializable
 data class RegisterFinishRequestJson(
@@ -23,21 +21,42 @@ data class RegisterFinishRequestJson(
     @SerialName("emailVerificationToken")
     val emailVerificationToken: String,
 
-    @SerialName("masterPasswordHash")
-    val masterPasswordHash: String,
-
     @SerialName("masterPasswordHint")
     val masterPasswordHint: String?,
 
-    @SerialName("userSymmetricKey")
-    val userSymmetricKey: String,
-
     @SerialName("userAsymmetricKeys")
     val userAsymmetricKeys: KeysJson,
 
-    @SerialName("kdf")
-    val kdfType: KdfTypeJson,
-
-    @SerialName("kdfIterations")
-    val kdfIterations: UInt,
-)
+    @SerialName("MasterPasswordAuthentication")
+    val authenticationData: MasterPasswordAuthenticationDataJson,
+
+    @SerialName("MasterPasswordUnlock")
+    val unlockData: MasterPasswordUnlockDataJson,
+) {
+    constructor(
+        email: String,
+        emailVerificationToken: String,
+        masterPasswordHint: String?,
+        userAsymmetricKeys: KeysJson,
+        kdf: KdfJson,
+        salt: String,
+        masterPasswordAuthenticationHash: String,
+        masterKeyWrappedUserKey: String,
+    ) : this(
+        email = email,
+        emailVerificationToken = emailVerificationToken,
+        masterPasswordHint = masterPasswordHint,
+        userAsymmetricKeys = userAsymmetricKeys,
+        authenticationData = MasterPasswordAuthenticationDataJson(
+            kdf = kdf,
+            salt = salt,
+            masterPasswordAuthenticationHash = masterPasswordAuthenticationHash,
+        ),
+        unlockData = MasterPasswordUnlockDataJson(
+            kdf = kdf,
+            salt = salt,
+            masterKeyWrappedUserKey = masterKeyWrappedUserKey,
+            containedKeyId = null,
+        ),
+    )
+}
diff --git a/network/src/test/kotlin/com/bitwarden/network/service/IdentityServiceTest.kt b/network/src/test/kotlin/com/bitwarden/network/service/IdentityServiceTest.kt
index a63c81081dd..8845d645ee2 100644
--- a/network/src/test/kotlin/com/bitwarden/network/service/IdentityServiceTest.kt
+++ b/network/src/test/kotlin/com/bitwarden/network/service/IdentityServiceTest.kt
@@ -5,6 +5,7 @@ import com.bitwarden.network.api.UnauthenticatedIdentityApi
 import com.bitwarden.network.base.BaseServiceTest
 import com.bitwarden.network.model.GetTokenResponseJson
 import com.bitwarden.network.model.IdentityTokenAuthModel
+import com.bitwarden.network.model.KdfJson
 import com.bitwarden.network.model.KdfTypeJson
 import com.bitwarden.network.model.KeyConnectorUserDecryptionOptionsJson
 import com.bitwarden.network.model.KeysJson
@@ -410,16 +411,21 @@ class IdentityServiceTest : BaseServiceTest() {
         private const val PASSWORD_HASH = "passwordHash"
         private val registerFinishRequestBody = RegisterFinishRequestJson(
             email = EMAIL,
-            masterPasswordHash = "mockk_masterPasswordHash",
-            masterPasswordHint = "mockk_masterPasswordHint",
             emailVerificationToken = "mock_emailVerificationToken",
-            userSymmetricKey = "mockk_key",
+            masterPasswordHint = "mockk_masterPasswordHint",
             userAsymmetricKeys = KeysJson(
                 publicKey = "mockk_publicKey",
                 encryptedPrivateKey = "mockk_encryptedPrivateKey",
             ),
-            kdfType = KdfTypeJson.PBKDF2_SHA256,
-            kdfIterations = 600000U,
+            kdf = KdfJson(
+                kdfType = KdfTypeJson.PBKDF2_SHA256,
+                iterations = 600000,
+                memory = null,
+                parallelism = null,
+            ),
+            salt = EMAIL,
+            masterPasswordAuthenticationHash = "mockk_masterPasswordHash",
+            masterKeyWrappedUserKey = "mockk_key",
         )
     }
 }