diff --git a/wiretap/network_instruments.c b/wiretap/network_instruments.c
index 554be28385..8984db543f 100644
--- a/wiretap/network_instruments.c
+++ b/wiretap/network_instruments.c
@@ -106,7 +106,7 @@ static gboolean observer_seek_read(wtap *wth, gint64 seek_off,
     union wtap_pseudo_header *pseudo_header, guint8 *pd, int length,
     int *err, gchar **err_info);
 static int read_packet_header(FILE_T fh, union wtap_pseudo_header *pseudo_header, 
-    packet_entry_header *packet_header, int *err, gchar **err_info);
+    packet_entry_header *packet_header, gboolean *decrypted_wireless, int *err, gchar **err_info);
 static int read_packet_data(FILE_T fh, int offset_to_frame, int current_offset_from_packet_header,
     guint8 *pd, int length, int *err, char **err_info);
 static gboolean skip_to_next_packet(wtap *wth, int offset_to_next_packet,
@@ -265,6 +265,7 @@ int network_instruments_open(wtap *wth, int *err, gchar **err_info)
 static gboolean observer_read(wtap *wth, int *err, gchar **err_info,
     gint64 *data_offset)
 {
+	gboolean decrypted_wireless;
     int header_bytes_consumed;
     int data_bytes_consumed;
     packet_entry_header packet_header;
@@ -274,8 +275,8 @@ static gboolean observer_read(wtap *wth, int *err, gchar **err_info,
         *data_offset = file_tell(wth->fh);
 
         /* process the packet header, including TLVs */
-        header_bytes_consumed = read_packet_header(wth->fh, &wth->pseudo_header, &packet_header, err,
-            err_info);
+        header_bytes_consumed = read_packet_header(wth->fh, &wth->pseudo_header, &packet_header, &decrypted_wireless, 
+            err, err_info);
         if (header_bytes_consumed <= 0)
             return FALSE;    /* EOF or error */
 
@@ -356,6 +357,11 @@ static gboolean observer_read(wtap *wth, int *err, gchar **err_info,
         return FALSE;
     }
 
+	/* clear the protected flag in the wireless header if needed */
+	if (decrypted_wireless && data_bytes_consumed > 1) {
+		*(buffer_start_ptr(wth->frame_buffer)+1) = (*(buffer_start_ptr(wth->frame_buffer)+1) & 0xbf);
+	}
+
     /* skip over any extra bytes following the frame data */
     if (!skip_to_next_packet(wth, packet_header.offset_to_next_packet,
             header_bytes_consumed + data_bytes_consumed, err, err_info)) {
@@ -370,15 +376,17 @@ static gboolean observer_seek_read(wtap *wth, gint64 seek_off,
     union wtap_pseudo_header *pseudo_header, guint8 *pd, int length,
     int *err, gchar **err_info)
 {
+	gboolean decrypted_wireless;
     packet_entry_header packet_header;
     int offset;
+	int data_bytes_consumed;
 
     if (file_seek(wth->random_fh, seek_off, SEEK_SET, err) == -1)
         return FALSE;
 
     /* process the packet header, including TLVs */
-    offset = read_packet_header(wth->random_fh, pseudo_header, &packet_header, err,
-        err_info);
+    offset = read_packet_header(wth->random_fh, pseudo_header, &packet_header, &decrypted_wireless,
+		err, err_info);
     if (offset <= 0)
         return FALSE;    /* EOF or error */
 
@@ -395,16 +403,23 @@ static gboolean observer_seek_read(wtap *wth, gint64 seek_off,
     }
 
     /* read the frame data */
-    if (!read_packet_data(wth->random_fh, packet_header.offset_to_frame,
-        offset, pd, length, err, err_info))
+	data_bytes_consumed = read_packet_data(wth->random_fh, packet_header.offset_to_frame,
+        offset, pd, length, err, err_info);
+    if (data_bytes_consumed < 0) {
         return FALSE;
+    }
+
+	/* clear the protected flag in the wireless header if needed */
+	if (decrypted_wireless && data_bytes_consumed > 1) {
+		*(pd+1) = (*(pd+1) & 0xbf);
+	}
 
     return TRUE;
 }
 
 static int
 read_packet_header(FILE_T fh, union wtap_pseudo_header *pseudo_header, 
-    packet_entry_header *packet_header, int *err, gchar **err_info)
+    packet_entry_header *packet_header, gboolean *decrypted_wireless, int *err, gchar **err_info)
 {
     int offset;
     int bytes_read;
@@ -486,6 +501,8 @@ read_packet_header(FILE_T fh, union wtap_pseudo_header *pseudo_header,
             pseudo_header->ieee_802_11.channel = wireless_header.frequency;
             pseudo_header->ieee_802_11.data_rate = wireless_header.rate;
             pseudo_header->ieee_802_11.signal_level = wireless_header.strengthPercent;
+			/* set decryption status */
+			*decrypted_wireless = (wireless_header.conditions & WIRELESS_WEP_SUCCESS) > 0;
             offset += bytes_read;
             break;
         default:
diff --git a/wiretap/network_instruments.h b/wiretap/network_instruments.h
index 57544eed91..a89e2a63ba 100644
--- a/wiretap/network_instruments.h
+++ b/wiretap/network_instruments.h
@@ -90,6 +90,11 @@ typedef struct tlv_wireless_info {
     guint8 reserved;
 } tlv_wireless_info;
 
+/*
+ * Wireless conditions
+ */
+#define WIRELESS_WEP_SUCCESS		0x80
+
 /*
  * TLV type values.
  */