diff --git a/matrix-sdk-android/src/main/java/im/vector/matrix/android/api/session/crypto/crosssigning/CrossSigningService.kt b/matrix-sdk-android/src/main/java/im/vector/matrix/android/api/session/crypto/crosssigning/CrossSigningService.kt
index f1c998cee5..6e4960b821 100644
--- a/matrix-sdk-android/src/main/java/im/vector/matrix/android/api/session/crypto/crosssigning/CrossSigningService.kt
+++ b/matrix-sdk-android/src/main/java/im/vector/matrix/android/api/session/crypto/crosssigning/CrossSigningService.kt
@@ -74,6 +74,7 @@ interface CrossSigningService {
                          otherDeviceId: String,
                          locallyTrusted: Boolean?): DeviceTrustResult
 
+    fun onSecretMSKGossip(mskPrivateKey: String)
     fun onSecretSSKGossip(sskPrivateKey: String)
     fun onSecretUSKGossip(uskPrivateKey: String)
 }
diff --git a/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/crypto/DefaultCryptoService.kt b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/crypto/DefaultCryptoService.kt
index a588cdc66e..4b031211e1 100755
--- a/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/crypto/DefaultCryptoService.kt
+++ b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/crypto/DefaultCryptoService.kt
@@ -34,6 +34,7 @@ import im.vector.matrix.android.api.listeners.ProgressListener
 import im.vector.matrix.android.api.session.crypto.CryptoService
 import im.vector.matrix.android.api.session.crypto.MXCryptoError
 import im.vector.matrix.android.api.session.crypto.crosssigning.KEYBACKUP_SECRET_SSSS_NAME
+import im.vector.matrix.android.api.session.crypto.crosssigning.MASTER_KEY_SSSS_NAME
 import im.vector.matrix.android.api.session.crypto.crosssigning.SELF_SIGNING_KEY_SSSS_NAME
 import im.vector.matrix.android.api.session.crypto.crosssigning.USER_SIGNING_KEY_SSSS_NAME
 import im.vector.matrix.android.api.session.crypto.keyshare.GossipingRequestListener
@@ -835,6 +836,10 @@ internal class DefaultCryptoService @Inject constructor(
      */
     private fun handleSDKLevelGossip(secretName: String?, secretValue: String): Boolean {
         return when (secretName) {
+            MASTER_KEY_SSSS_NAME -> {
+                crossSigningService.onSecretMSKGossip(secretValue)
+                true
+            }
             SELF_SIGNING_KEY_SSSS_NAME -> {
                 crossSigningService.onSecretSSKGossip(secretValue)
                 true
diff --git a/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/crypto/IncomingGossipingRequestManager.kt b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/crypto/IncomingGossipingRequestManager.kt
index 38f81ba47d..addcc539e4 100644
--- a/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/crypto/IncomingGossipingRequestManager.kt
+++ b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/crypto/IncomingGossipingRequestManager.kt
@@ -19,6 +19,7 @@ package im.vector.matrix.android.internal.crypto
 import im.vector.matrix.android.api.auth.data.Credentials
 import im.vector.matrix.android.api.crypto.MXCryptoConfig
 import im.vector.matrix.android.api.session.crypto.crosssigning.KEYBACKUP_SECRET_SSSS_NAME
+import im.vector.matrix.android.api.session.crypto.crosssigning.MASTER_KEY_SSSS_NAME
 import im.vector.matrix.android.api.session.crypto.crosssigning.SELF_SIGNING_KEY_SSSS_NAME
 import im.vector.matrix.android.api.session.crypto.crosssigning.USER_SIGNING_KEY_SSSS_NAME
 import im.vector.matrix.android.api.session.crypto.keyshare.GossipingRequestListener
@@ -310,8 +311,8 @@ internal class IncomingGossipingRequestManager @Inject constructor(
 
         val isDeviceLocallyVerified = cryptoStore.getUserDevice(userId, deviceId)?.trustLevel?.isLocallyVerified()
 
-        // Should SDK always Silently reject any request for the master key?
         when (secretName) {
+            MASTER_KEY_SSSS_NAME       -> cryptoStore.getCrossSigningPrivateKeys()?.master
             SELF_SIGNING_KEY_SSSS_NAME -> cryptoStore.getCrossSigningPrivateKeys()?.selfSigned
             USER_SIGNING_KEY_SSSS_NAME -> cryptoStore.getCrossSigningPrivateKeys()?.user
             KEYBACKUP_SECRET_SSSS_NAME -> cryptoStore.getKeyBackupRecoveryKeyInfo()?.recoveryKey
diff --git a/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/crypto/crosssigning/DefaultCrossSigningService.kt b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/crypto/crosssigning/DefaultCrossSigningService.kt
index 2fee8130fb..445c44de0e 100644
--- a/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/crypto/crosssigning/DefaultCrossSigningService.kt
+++ b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/crypto/crosssigning/DefaultCrossSigningService.kt
@@ -168,6 +168,33 @@ internal class DefaultCrossSigningService @Inject constructor(
         }.executeBy(taskExecutor)
     }
 
+    override fun onSecretMSKGossip(mskPrivateKey: String) {
+        Timber.i("## CrossSigning - onSecretSSKGossip")
+        val mxCrossSigningInfo = getMyCrossSigningKeys() ?: return Unit.also {
+            Timber.e("## CrossSigning - onSecretMSKGossip() received secret but public key is not known")
+        }
+
+        mskPrivateKey.fromBase64()
+                .let { privateKeySeed ->
+                    val pkSigning = OlmPkSigning()
+                    try {
+                        if (pkSigning.initWithSeed(privateKeySeed) == mxCrossSigningInfo.masterKey()?.unpaddedBase64PublicKey) {
+                            masterPkSigning?.releaseSigning()
+                            masterPkSigning = pkSigning
+                            Timber.i("## CrossSigning - Loading MSK success")
+                            cryptoStore.storeMSKPrivateKey(mskPrivateKey)
+                            return
+                        } else {
+                            Timber.e("## CrossSigning - onSecretMSKGossip() private key do not match public key")
+                            pkSigning.releaseSigning()
+                        }
+                    } catch (failure: Throwable) {
+                        Timber.e("## CrossSigning - onSecretMSKGossip() ${failure.localizedMessage}")
+                        pkSigning.releaseSigning()
+                    }
+                }
+    }
+
     override fun onSecretSSKGossip(sskPrivateKey: String) {
         Timber.i("## CrossSigning - onSecretSSKGossip")
         val mxCrossSigningInfo = getMyCrossSigningKeys() ?: return Unit.also {
diff --git a/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/crypto/store/IMXCryptoStore.kt b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/crypto/store/IMXCryptoStore.kt
index 69f0985391..7125cadebf 100644
--- a/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/crypto/store/IMXCryptoStore.kt
+++ b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/crypto/store/IMXCryptoStore.kt
@@ -397,6 +397,7 @@ internal interface IMXCryptoStore {
     fun markMyMasterKeyAsLocallyTrusted(trusted: Boolean)
 
     fun storePrivateKeysInfo(msk: String?, usk: String?, ssk: String?)
+    fun storeMSKPrivateKey(msk: String?)
     fun storeSSKPrivateKey(ssk: String?)
     fun storeUSKPrivateKey(usk: String?)
 
diff --git a/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/crypto/store/db/RealmCryptoStore.kt b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/crypto/store/db/RealmCryptoStore.kt
index a78ab70b72..7910bfc72c 100644
--- a/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/crypto/store/db/RealmCryptoStore.kt
+++ b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/crypto/store/db/RealmCryptoStore.kt
@@ -395,6 +395,14 @@ internal class RealmCryptoStore @Inject constructor(
         }
     }
 
+    override fun storeMSKPrivateKey(msk: String?) {
+        doRealmTransaction(realmConfiguration) { realm ->
+            realm.where<CryptoMetadataEntity>().findFirst()?.apply {
+                xSignMasterPrivateKey = msk
+            }
+        }
+    }
+
     override fun storeSSKPrivateKey(ssk: String?) {
         doRealmTransaction(realmConfiguration) { realm ->
             realm.where<CryptoMetadataEntity>().findFirst()?.apply {
diff --git a/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/crypto/verification/DefaultVerificationService.kt b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/crypto/verification/DefaultVerificationService.kt
index 0f1666bd9d..1b50d3caa1 100644
--- a/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/crypto/verification/DefaultVerificationService.kt
+++ b/matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/crypto/verification/DefaultVerificationService.kt
@@ -23,6 +23,7 @@ import im.vector.matrix.android.api.MatrixCallback
 import im.vector.matrix.android.api.session.crypto.CryptoService
 import im.vector.matrix.android.api.session.crypto.crosssigning.CrossSigningService
 import im.vector.matrix.android.api.session.crypto.crosssigning.KEYBACKUP_SECRET_SSSS_NAME
+import im.vector.matrix.android.api.session.crypto.crosssigning.MASTER_KEY_SSSS_NAME
 import im.vector.matrix.android.api.session.crypto.crosssigning.SELF_SIGNING_KEY_SSSS_NAME
 import im.vector.matrix.android.api.session.crypto.crosssigning.USER_SIGNING_KEY_SSSS_NAME
 import im.vector.matrix.android.api.session.crypto.verification.CancelCode
@@ -809,6 +810,8 @@ internal class DefaultVerificationService @Inject constructor(
                             ?.let { vt ->
                                 val otherDeviceId = vt.otherDeviceId
                                 if (!crossSigningService.canCrossSign()) {
+                                    outgoingGossipingRequestManager.sendSecretShareRequest(MASTER_KEY_SSSS_NAME, mapOf(userId to listOf(otherDeviceId
+                                            ?: "*")))
                                     outgoingGossipingRequestManager.sendSecretShareRequest(SELF_SIGNING_KEY_SSSS_NAME, mapOf(userId to listOf(otherDeviceId
                                             ?: "*")))
                                     outgoingGossipingRequestManager.sendSecretShareRequest(USER_SIGNING_KEY_SSSS_NAME, mapOf(userId to listOf(otherDeviceId
@@ -821,7 +824,7 @@ internal class DefaultVerificationService @Inject constructor(
     }
 
     private fun handleDoneReceived(senderId: String, doneReq: ValidVerificationDone) {
-        Timber.v("## SAS Done receieved $doneReq")
+        Timber.v("## SAS Done received $doneReq")
         val existing = getExistingTransaction(senderId, doneReq.transactionId)
         if (existing == null) {
             Timber.e("## SAS Received invalid Done request")