diff --git a/aiozk/client.py b/aiozk/client.py
index 728b3ab..dcec02b 100644
--- a/aiozk/client.py
+++ b/aiozk/client.py
@@ -105,6 +105,18 @@ async def exists(self, path, watch=False):
             return False
         return True
 
+    async def add_auth(self, scheme, auth):
+        """
+        @scheme: world auth digest ip
+        @auth: according by @scheme
+        @return: True/False
+        """
+        try:
+            await self.send(protocol.AuthRequest(type=0, scheme=scheme, auth=auth))
+        except Exception:
+            return False
+        return True
+
     async def create(
         self,
         path,
diff --git a/aiozk/protocol/acl.py b/aiozk/protocol/acl.py
index f3a751a..abc2f42 100644
--- a/aiozk/protocol/acl.py
+++ b/aiozk/protocol/acl.py
@@ -1,3 +1,5 @@
+import hashlib
+from base64 import b64encode
 from .request import Request
 from .response import Response
 from .part import Part
@@ -5,6 +7,13 @@
 from .primitives import UString, Int, Vector
 
 
+def make_digest_acl_credential(username, password):
+    """Create a SHA1 digest credential"""
+    credential = username.encode('utf-8') + b":" + password.encode('utf-8')
+    cred_hash = b64encode(hashlib.sha1(credential).digest()).strip()
+    return username + ":" + cred_hash.decode('utf-8')
+
+
 class ID(Part):
     """
     """
@@ -69,6 +78,10 @@ def set_perms(self, read, write, create, delete, admin):
     read=True, write=True, create=True, delete=True, admin=True
 )
 
+DIGEST_ACCESS = lambda username, password: ACL.make(
+    scheme="digest", id=make_digest_acl_credential(username, password),
+    read=True, write=True, create=True, delete=True, admin=True
+)
 
 class GetACLRequest(Request):
     """