diff --git a/patator.py b/patator.py
index 93fe849..91ec6d9 100755
--- a/patator.py
+++ b/patator.py
@@ -1981,6 +1981,15 @@ try:
 except ImportError:
   warnings.append('paramiko')
 
+def load_keyfile(keyfile):
+  for cls in (paramiko.RSAKey, paramiko.DSSKey, paramiko.ECDSAKey):
+    try:
+      return cls.from_private_key_file(keyfile)
+    except paramiko.SSHException:
+      pass
+  else:
+    raise
+
 class SSH_login(TCP_Cache):
   '''Brute-force SSH'''
 
@@ -1993,7 +2002,8 @@ class SSH_login(TCP_Cache):
     ('port', 'target port [22]'),
     ('user', 'usernames to test'),
     ('password', 'passwords to test'),
-    ('auth_type', 'auth type to use [password|keyboard-interactive|auto]'),
+    ('auth_type', 'type of password authentication to use [password|keyboard-interactive|auto]'),
+    ('keyfile', 'file with RSA, DSA or ECDSA private key to test'),
     )
   available_options += TCP_Cache.available_options
 
@@ -2005,25 +2015,34 @@ class SSH_login(TCP_Cache):
 
     return TCP_Connection(fp, fp.remote_version)
 
-  def execute(self, host, port='22', user=None, password=None, auth_type='password', persistent='1'):
+  def execute(self, host, port='22', user=None, password=None, auth_type='password', keyfile=None, persistent='1'):
 
     with Timing() as timing:
       fp, banner = self.bind(host, port, user)
 
     try:
-      if user is not None and password is not None:
+      if user is not None:
+
+        if keyfile is not None:
+          key = load_keyfile(keyfile)
+
         with Timing() as timing:
-          if auth_type == 'password':
-            fp.auth_password(user, password, fallback=False)
 
-          elif auth_type == 'keyboard-interactive':
-            fp.auth_interactive(user, lambda a,b,c: [password] if len(c) == 1 else [])
+          if keyfile is not None:
+            fp.auth_publickey(user, key)
 
-          elif auth_type == 'auto':
-            fp.auth_password(user, password, fallback=True)
+          elif password is not None:
+            if auth_type == 'password':
+              fp.auth_password(user, password, fallback=False)
 
-          else:
-            raise NotImplementedError("Incorrect auth_type '%s'" % auth_type)
+            elif auth_type == 'keyboard-interactive':
+              fp.auth_interactive(user, lambda a,b,c: [password] if len(c) == 1 else [])
+
+            elif auth_type == 'auto':
+              fp.auth_password(user, password, fallback=True)
+
+            else:
+              raise NotImplementedError("Incorrect auth_type '%s'" % auth_type)
 
       logger.debug('No error')
       code, mesg = '0', banner
@@ -3101,10 +3120,10 @@ class Response_HTTP(Response_Base):
 
   def __str__(self):
     lines = re.findall('^(HTTP/.+)$', self.mesg, re.M)
-    if not lines:
-      return 'Unexpected HTTP response'
-    else:
+    if lines:
       return lines[-1]
+    else:
+      return self.mesg
 
   def match_clen(self, val):
     return match_range(self.content_length, val)
@@ -3989,22 +4008,24 @@ class Dummy_test:
 
   usage_hints = (
     """%prog data=RANGE0 0=hex:0x00-0xffff""",
-    """%prog data=PROG0 0='seq 0 80'""",
+    """%prog data=RANGE0 0=int:10-0""",
+    """%prog data=PROG0 0='seq -w 10 -1 0'""",
     """%prog data=PROG0 0='mp64.bin -i ?l?l?l',$(mp64.bin --combination -i ?l?l?l)""",
     )
 
   available_options = (
     ('data', 'data to test'),
     ('data2', 'data2 to test'),
+    ('delay', 'fake random delay'),
     )
   available_actions = ()
 
   Response = Response_Base
 
-  def execute(self, data, data2=''):
+  def execute(self, data, data2='', delay='1'):
     code, mesg = 0, '%s / %s' % (data, data2)
     with Timing() as timing:
-      sleep(random.random())
+      sleep(random.randint(0, int(delay)*1000)/1000.0)
 
     return self.Response(code, mesg, timing)