diff --git a/tangem-core/src/main/java/com/tangem/CardSession.kt b/tangem-core/src/main/java/com/tangem/CardSession.kt
index 1852ae25d9..9977e9b17f 100644
--- a/tangem-core/src/main/java/com/tangem/CardSession.kt
+++ b/tangem-core/src/main/java/com/tangem/CardSession.kt
@@ -7,6 +7,7 @@ import com.tangem.commands.ReadCommand
 import com.tangem.common.CompletionResult
 import com.tangem.common.apdu.CommandApdu
 import com.tangem.common.apdu.ResponseApdu
+import com.tangem.common.extensions.calculateSha256
 import com.tangem.crypto.EncryptionHelper
 import com.tangem.crypto.FastEncryptionHelper
 import com.tangem.crypto.StrongEncryptionHelper
@@ -207,7 +208,7 @@ class CardSession(
             when (result) {
                 is CompletionResult.Success -> {
                     val uid = result.data.uid
-                    val protocolKey = environment.pin1.pbkdf2Hash(uid, 50)
+                    val protocolKey = environment.pin1.calculateSha256().pbkdf2Hash(uid, 50)
                     val secret = encryptionHelper.generateSecret(result.data.sessionKeyB)
                     val sessionKey = (secret + protocolKey).calculateSha256()
                     environment.encryptionKey = sessionKey