diff --git a/scada-common/network.lua b/scada-common/network.lua
index d9fa83f..742f418 100644
--- a/scada-common/network.lua
+++ b/scada-common/network.lua
@@ -7,7 +7,7 @@ local log    = require("scada-common.log")
 local util   = require("scada-common.util")
 
 local md5    = require("lockbox.digest.md5")
-local sha256 = require("lockbox.digest.sha2_256")
+local sha1   = require("lockbox.digest.sha1")
 local pbkdf2 = require("lockbox.kdf.pbkdf2")
 local hmac   = require("lockbox.mac.hmac")
 local stream = require("lockbox.util.stream")
@@ -31,12 +31,12 @@ function network.init_mac(passkey)
     local key_deriv = pbkdf2()
 
     -- setup PBKDF2
-    key_deriv.setPassword(passkey)
+    key_deriv.setPRF(hmac().setBlockSize(64).setDigest(sha1))
+    key_deriv.setBlockLen(20)
+    key_deriv.setDKeyLen(20)
+    key_deriv.setIterations(256)
     key_deriv.setSalt("pepper")
-    key_deriv.setIterations(32)
-    key_deriv.setBlockLen(8)
-    key_deriv.setDKeyLen(16)
-    key_deriv.setPRF(hmac().setBlockSize(64).setDigest(sha256))
+    key_deriv.setPassword(passkey)
     key_deriv.finish()
 
     c_eng.key = array.fromHex(key_deriv.asHex())
diff --git a/scada-common/util.lua b/scada-common/util.lua
index f407e36..10b4202 100644
--- a/scada-common/util.lua
+++ b/scada-common/util.lua
@@ -22,7 +22,7 @@ local t_pack   = table.pack
 local util = {}
 
 -- scada-common version
-util.version = "1.1.13"
+util.version = "1.1.14"
 
 util.TICK_TIME_S = 0.05
 util.TICK_TIME_MS = 50