diff --git a/transport/hub/kcpv/crypto.go b/transport/hub/kcpv/crypto.go
new file mode 100644
index 00000000..049c9f2d
--- /dev/null
+++ b/transport/hub/kcpv/crypto.go
@@ -0,0 +1,21 @@
+package kcpv
+
+import (
+	"crypto/aes"
+	"crypto/cipher"
+	"crypto/sha256"
+)
+
+func generateKeyFromConfigString(key string) []byte {
+	key += "consensus salt: Let's fight arcifical deceleration with our code. We shall prove our believes with action."
+	keyw := sha256.Sum256([]byte(key))
+	return keyw[:]
+}
+
+func generateBlockWithKey(key []byte) (cipher.Block, error) {
+	return aes.NewCipher(key)
+}
+
+func GetChipher(key string) (cipher.Block, error) {
+	return generateBlockWithKey(generateKeyFromConfigString(key))
+}