diff --git a/mesh/prov-acceptor.c b/mesh/prov-acceptor.c
index a03ee1c..4ec6ea3 100644
--- a/mesh/prov-acceptor.c
+++ b/mesh/prov-acceptor.c
@@ -203,6 +203,10 @@ static bool prov_calc_secret(const uint8_t *pub, const uint8_t *priv,
 
 static bool acp_credentials(struct mesh_prov_acceptor *prov)
 {
+	if (!memcmp(prov->conf_inputs.prv_pub_key,
+					prov->conf_inputs.dev_pub_key, 64))
+		return false;
+
 	if (!prov_calc_secret(prov->conf_inputs.prv_pub_key,
 			prov->private_key, prov->secret))
 		return false;
@@ -529,6 +533,13 @@ static void acp_prov_rx(void *user_data, const uint8_t *data, uint16_t len)
 		break;
 
 	case PROV_RANDOM: /* Random Value */
+
+		/* Disallow matching random values */
+		if (!memcmp(prov->rand_auth_workspace, data, 16)) {
+			fail.reason = PROV_ERR_INVALID_PDU;
+			goto failure;
+		}
+
 		/* Calculate Session key (needed later) while data is fresh */
 		mesh_crypto_prov_prov_salt(prov->salt, data,
 						prov->rand_auth_workspace,
diff --git a/mesh/prov-initiator.c b/mesh/prov-initiator.c
index 8399282..4f492a4 100644
--- a/mesh/prov-initiator.c
+++ b/mesh/prov-initiator.c
@@ -202,6 +202,10 @@ static bool prov_calc_secret(const uint8_t *pub, const uint8_t *priv,
 
 static bool int_credentials(struct mesh_prov_initiator *prov)
 {
+	if (!memcmp(prov->conf_inputs.prv_pub_key,
+					prov->conf_inputs.dev_pub_key, 64))
+		return false;
+
 	if (!prov_calc_secret(prov->conf_inputs.dev_pub_key,
 				prov->private_key, prov->secret))
 		return false;
@@ -736,6 +740,12 @@ static void int_prov_rx(void *user_data, const uint8_t *data, uint16_t len)
 	case PROV_RANDOM: /* Random */
 		prov->state = INT_PROV_RAND_ACKED;
 
+		/* Disallow matching random values */
+		if (!memcmp(prov->rand_auth_workspace, data, 16)) {
+			fail_code[1] = PROV_ERR_INVALID_PDU;
+			goto failure;
+		}
+
 		/* RXed Device Confirmation */
 		calc_local_material(data);
 		memcpy(prov->rand_auth_workspace + 16, data, 16);