diff --git a/Contributors.rdoc b/Contributors.rdoc
index a169b5b..bef012a 100644
--- a/Contributors.rdoc
+++ b/Contributors.rdoc
@@ -19,3 +19,4 @@ Contributions since:
 * Derek Harmel (derekharmel)
 * Erik Hetzner (egh)
 * nowhereman
+* David J. Lee (DavidJLee)
diff --git a/lib/net/ber/core_ext/string.rb b/lib/net/ber/core_ext/string.rb
index 28aeedd..876bc79 100644
--- a/lib/net/ber/core_ext/string.rb
+++ b/lib/net/ber/core_ext/string.rb
@@ -16,6 +16,14 @@ module Net::BER::Extensions::String
     [code].pack('C') + raw_string.length.to_ber_length_encoding + raw_string
   end
 
+	##
+	# Converts a string to a BER string but does *not* encode to UTF-8 first.
+	# This is required for proper representation of binary data for Microsoft
+	# Active Directory
+	def to_ber_bin(code = 0x04)
+		[code].pack('C') + length.to_ber_length_encoding + self
+	end
+
   def raw_utf8_encoded
     if self.respond_to?(:encode)
       # Strings should be UTF-8 encoded according to LDAP.
diff --git a/lib/net/ldap/filter.rb b/lib/net/ldap/filter.rb
index 660684f..9b6828c 100644
--- a/lib/net/ldap/filter.rb
+++ b/lib/net/ldap/filter.rb
@@ -23,7 +23,7 @@
 class Net::LDAP::Filter
   ##
   # Known filter types.
-  FilterTypes = [ :ne, :eq, :ge, :le, :and, :or, :not, :ex ]
+  FilterTypes = [ :ne, :eq, :ge, :le, :and, :or, :not, :ex, :bineq ]
 
   def initialize(op, left, right) #:nodoc:
     unless FilterTypes.include?(op)
@@ -65,6 +65,23 @@ class Net::LDAP::Filter
       new(:eq, attribute, value)
     end
 
+		##
+		# Creates a Filter object indicating a binary comparison.
+		# this prevents the search data from being forced into a UTF-8 string.
+		#
+		# This is primarily used for Microsoft Active Directory to compare
+		# GUID values.
+		#
+		#    # for guid represented as hex charecters
+		#    guid = "6a31b4a12aa27a41aca9603f27dd5116"
+		#    guid_bin = [guid].pack("H*")
+		#    f = Net::LDAP::Filter.bineq("objectGUID", guid_bin)
+		#
+		# This filter does not perform any escaping.
+		def bineq(attribute, value)
+			new(:bineq, attribute, value)
+		end
+
     ##
     # Creates a Filter object indicating extensible comparison. This Filter
     # object is currently considered EXPERIMENTAL.
@@ -399,6 +416,8 @@ class Net::LDAP::Filter
       "!(#{@left}=#{@right})"
     when :eq
       "#{@left}=#{@right}"
+		when :bineq
+			"#{@left}=#{@right}"
     when :ex
       "#{@left}:=#{@right}"
     when :ge
@@ -508,6 +527,9 @@ class Net::LDAP::Filter
       else # equality
         [@left.to_s.to_ber, unescape(@right).to_ber].to_ber_contextspecific(3)
       end
+		when :bineq
+			# make sure data is not forced to UTF-8
+			[@left.to_s.to_ber, unescape(@right).to_ber_bin].to_ber_contextspecific(3)
     when :ex
       seq = []
 
diff --git a/spec/unit/ber/ber_spec.rb b/spec/unit/ber/ber_spec.rb
index 86dc48a..10288d0 100644
--- a/spec/unit/ber/ber_spec.rb
+++ b/spec/unit/ber/ber_spec.rb
@@ -84,6 +84,11 @@ describe "BER encoding of" do
       it "should properly encode strings encodable as UTF-8" do
         "teststring".encode("US-ASCII").to_ber.should == "\x04\nteststring"
       end
+			it "should properly encode binary data strings using to_ber_bin" do
+				# This is used for searching for GUIDs in Active Directory
+				["6a31b4a12aa27a41aca9603f27dd5116"].pack("H*").to_ber_bin.should == 
+					"\x04\x10" + "j1\xB4\xA1*\xA2zA\xAC\xA9`?'\xDDQ\x16"
+			end
       it "should fail on strings that can not be converted to UTF-8" do
         error = Encoding::UndefinedConversionError
         lambda {"\x81".to_ber }.should raise_exception(error)