diff --git a/contracts/common/basic.sol b/contracts/common/basic.sol
index 8092d66c..27fbfc43 100644
--- a/contracts/common/basic.sol
+++ b/contracts/common/basic.sol
@@ -27,4 +27,14 @@ abstract contract Basic is DSMath, Stores {
         return abi.encode(eventName, eventParam);
     }
 
-}
\ No newline at end of file
+    function convertEthToWeth(bool isEth, TokenInterface token, uint amount) internal {
+        if(isEth) token.deposit{value: amount}();
+    }
+
+    function convertWethToEth(bool isEth, TokenInterface token, uint amount) internal {
+       if(isEth) {
+            token.approve(address(token), amount);
+            token.withdraw(amount);
+        }
+    }
+}
diff --git a/contracts/common/interfaces.sol b/contracts/common/interfaces.sol
index 5caf0964..e0a92c1c 100644
--- a/contracts/common/interfaces.sol
+++ b/contracts/common/interfaces.sol
@@ -17,4 +17,10 @@ interface MemoryInterface {
 
 interface InstaMapping {
     function cTokenMapping(address) external view returns (address);
-}
\ No newline at end of file
+}
+
+interface AccountInterface {
+    function enable(address) external;
+    function disable(address) external;
+    function isAuth(address) external view returns (bool);
+}
diff --git a/contracts/common/utils.sol b/contracts/common/utils.sol
deleted file mode 100644
index d5523349..00000000
--- a/contracts/common/utils.sol
+++ /dev/null
@@ -1,16 +0,0 @@
-pragma solidity ^0.7.0;
-
-import { TokenInterface } from "./interfaces.sol";
-
-abstract contract Utils {
-    function convertEthToWeth(bool isEth, TokenInterface token, uint amount) internal {
-        if(isEth) token.deposit{value: amount}();
-    }
-
-    function convertWethToEth(bool isEth, TokenInterface token, uint amount) internal {
-       if(isEth) {
-            token.approve(address(token), amount);
-            token.withdraw(amount);
-        }
-    }
-}
\ No newline at end of file
diff --git a/contracts/connectors/aave/v2/main.sol b/contracts/connectors/aave/v2/main.sol
index 6ed00cfa..cbf717ee 100644
--- a/contracts/connectors/aave/v2/main.sol
+++ b/contracts/connectors/aave/v2/main.sol
@@ -2,12 +2,11 @@ pragma solidity ^0.7.0;
 
 import { TokenInterface } from "../../../common/interfaces.sol";
 import { Stores } from "../../../common/stores.sol";
-import { Utils } from "../../../common/utils.sol";
 import { Helpers } from "./helpers.sol";
 import { Events } from "./events.sol";
 import { AaveInterface } from "./interface.sol";
 
-abstract contract AaveResolver is Events, Helpers, Utils {
+abstract contract AaveResolver is Events, Helpers {
     /**
      * @dev Deposit ETH/ERC20_Token.
      * @param token token address to deposit.(For ETH: 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE)
diff --git a/contracts/connectors/authority/events.sol b/contracts/connectors/authority/events.sol
new file mode 100644
index 00000000..1ad38da7
--- /dev/null
+++ b/contracts/connectors/authority/events.sol
@@ -0,0 +1,6 @@
+pragma solidity ^0.7.0;
+
+contract Events {
+    event LogAddAuth(address indexed _msgSender, address indexed _authority);
+    event LogRemoveAuth(address indexed _msgSender, address indexed _authority);
+}
\ No newline at end of file
diff --git a/contracts/connectors/authority/helpers.sol b/contracts/connectors/authority/helpers.sol
new file mode 100644
index 00000000..f50ef089
--- /dev/null
+++ b/contracts/connectors/authority/helpers.sol
@@ -0,0 +1,15 @@
+pragma solidity ^0.7.0;
+pragma experimental ABIEncoderV2;
+
+import { DSMath } from "../../common/math.sol";
+import { Basic } from "../../common/basic.sol";
+import { ListInterface } from "./interface.sol";
+
+abstract contract Helpers is DSMath, Basic {
+    ListInterface internal constant listContract = ListInterface(0x4c8a1BEb8a87765788946D6B19C6C6355194AbEb);
+
+    function checkAuthCount() internal view returns (uint count) {
+        uint64 accountId = listContract.accountID(address(this));
+        count = listContract.accountLink(accountId).count;
+    }
+}
diff --git a/contracts/connectors/authority/interface.sol b/contracts/connectors/authority/interface.sol
new file mode 100644
index 00000000..5b7fde6d
--- /dev/null
+++ b/contracts/connectors/authority/interface.sol
@@ -0,0 +1,13 @@
+pragma solidity ^0.7.0;
+pragma experimental ABIEncoderV2;
+
+interface ListInterface {
+    struct AccountLink {
+        address first;
+        address last;
+        uint64 count;
+    }
+
+    function accountID(address) external view returns (uint64);
+    function accountLink(uint64) external view returns (AccountLink memory);
+}
\ No newline at end of file
diff --git a/contracts/connectors/authority/main.sol b/contracts/connectors/authority/main.sol
new file mode 100644
index 00000000..db7cb53f
--- /dev/null
+++ b/contracts/connectors/authority/main.sol
@@ -0,0 +1,34 @@
+pragma solidity ^0.7.0;
+
+import { AccountInterface } from "../../common/interfaces.sol";
+import { Helpers } from "./helpers.sol";
+import { Events } from "./events.sol";
+
+abstract contract AuthorityResolver is Events, Helpers {
+    /**
+     * @dev Add New authority
+     * @param authority authority Address.
+     */
+    function add(
+        address authority
+    ) external payable returns (string memory _eventName, bytes memory _eventParam) {
+        AccountInterface(address(this)).enable(authority);
+
+        _eventName = "LogAddAuth(address,address)";
+        _eventParam = abi.encode(msg.sender, authority);
+    }
+
+    /**
+     * @dev Remove authority
+     * @param authority authority Address.
+     */
+    function remove(
+        address authority
+    ) external payable returns (string memory _eventName, bytes memory _eventParam) {
+        require(checkAuthCount() > 1, "Removing-all-authorities");
+        AccountInterface(address(this)).disable(authority);
+
+        _eventName = "LogRemoveAuth(address,address)";
+        _eventParam = abi.encode(msg.sender, authority);
+    }
+}