diff --git a/ajax.php b/ajax.php
index d9edc456..c13fd60a 100644
--- a/ajax.php
+++ b/ajax.php
@@ -219,7 +219,7 @@ if(isset($_GET['share_generate_link'])){
   $item_note = trim(strip_tags(mysqli_real_escape_string($mysqli,$_GET['note'])));
   $item_view_limit = intval($_GET['views']);
   $item_expires = trim(strip_tags(mysqli_real_escape_string($mysqli,$_GET['expires'])));
-  $item_key = keygen();
+  $item_key = bin2hex(random_bytes(78));
 
   if($item_type == "Document"){
     $row = mysqli_fetch_array(mysqli_query($mysqli, "SELECT document_name FROM documents WHERE document_id = '$item_id' AND document_client_id = '$client_id' LIMIT 1"));
diff --git a/cron.php b/cron.php
index ff77c041..62065466 100644
--- a/cron.php
+++ b/cron.php
@@ -285,7 +285,7 @@ while($row = mysqli_fetch_array($sql_companies)){
       mysqli_query($mysqli,"UPDATE settings SET config_invoice_next_number = $new_config_invoice_next_number WHERE company_id = $company_id");
 
       //Generate a unique URL key for clients to access
-      $url_key = keygen();
+      $url_key = bin2hex(random_bytes(78));
 
       mysqli_query($mysqli,"INSERT INTO invoices SET invoice_prefix = '$config_invoice_prefix', invoice_number = $new_invoice_number, invoice_scope = '$recurring_scope', invoice_date = CURDATE(), invoice_due = DATE_ADD(CURDATE(), INTERVAL $client_net_terms day), invoice_amount = '$recurring_amount', invoice_currency_code = '$recurring_currency_code', invoice_note = '$recurring_note', invoice_category_id = $category_id, invoice_status = 'Sent', invoice_url_key = '$url_key', invoice_created_at = NOW(), invoice_client_id = $client_id, company_id = $company_id");
 
diff --git a/post.php b/post.php
index f5476dc3..6ab175bf 100644
--- a/post.php
+++ b/post.php
@@ -2544,7 +2544,7 @@ if(isset($_POST['add_invoice'])){
     mysqli_query($mysqli,"UPDATE settings SET config_invoice_next_number = $new_config_invoice_next_number WHERE company_id = $session_company_id");
 
     //Generate a unique URL key for clients to access
-    $url_key = keygen();
+    $url_key = bin2hex(random_bytes(78));
 
     mysqli_query($mysqli,"INSERT INTO invoices SET invoice_prefix = '$config_invoice_prefix', invoice_number = $invoice_number, invoice_scope = '$scope', invoice_date = '$date', invoice_due = DATE_ADD('$date', INTERVAL $client_net_terms day), invoice_currency_code = '$session_company_currency', invoice_category_id = $category, invoice_status = 'Draft', invoice_url_key = '$url_key', invoice_client_id = $client, company_id = $session_company_id");
     $invoice_id = mysqli_insert_id($mysqli);
@@ -2602,7 +2602,7 @@ if(isset($_POST['add_invoice_copy'])){
     $category_id = $row['invoice_category_id'];
 
     //Generate a unique URL key for clients to access
-    $url_key = keygen();
+    $url_key = bin2hex(random_bytes(78));
 
     mysqli_query($mysqli,"INSERT INTO invoices SET invoice_prefix = '$config_invoice_prefix', invoice_number = $invoice_number, invoice_scope = '$invoice_scope', invoice_date = '$date', invoice_due = DATE_ADD('$date', INTERVAL $client_net_terms day), invoice_category_id = $category_id, invoice_status = 'Draft', invoice_amount = '$invoice_amount', invoice_currency_code = '$invoice_currency_code', invoice_note = '$invoice_note', invoice_url_key = '$url_key', invoice_client_id = $client_id, company_id = $session_company_id") or die(mysql_error());
 
@@ -2698,7 +2698,7 @@ if(isset($_POST['add_quote'])){
     mysqli_query($mysqli,"UPDATE settings SET config_quote_next_number = $new_config_quote_next_number WHERE company_id = $session_company_id");
 
     //Generate a unique URL key for clients to access
-    $quote_url_key = keygen();
+    $quote_url_key = bin2hex(random_bytes(78));
 
     mysqli_query($mysqli,"INSERT INTO quotes SET quote_prefix = '$config_quote_prefix', quote_number = $quote_number, quote_scope = '$scope', quote_date = '$date', quote_currency_code = '$session_company_currency', quote_category_id = $category, quote_status = 'Draft', quote_url_key = '$quote_url_key', quote_client_id = $client, company_id = $session_company_id");
 
@@ -2735,7 +2735,7 @@ if(isset($_POST['add_quote_copy'])){
     $category_id = $row['quote_category_id'];
 
     //Generate a unique URL key for clients to access
-    $quote_url_key = keygen();
+    $quote_url_key = bin2hex(random_bytes(78));
 
     mysqli_query($mysqli,"INSERT INTO quotes SET quote_prefix = '$config_quote_prefix', quote_number = $quote_number, quote_scope = '$quote_scope', quote_date = '$date', quote_category_id = $category_id, quote_status = 'Draft', quote_amount = '$quote_amount', quote_currency_code = '$quote_currency_code', quote_note = '$quote_note', quote_url_key = '$quote_url_key', quote_client_id = $client_id, company_id = $session_company_id");
 
@@ -2788,7 +2788,7 @@ if(isset($_POST['add_quote_to_invoice'])){
     $category_id = $row['quote_category_id'];
 
     //Generate a unique URL key for clients to access
-    $url_key = keygen();
+    $url_key = bin2hex(random_bytes(78));
 
     mysqli_query($mysqli,"INSERT INTO invoices SET invoice_prefix = '$config_invoice_prefix', invoice_number = $invoice_number, invoice_scope = '$quote_scope', invoice_date = '$date', invoice_due = DATE_ADD(CURDATE(), INTERVAL $client_net_terms day), invoice_category_id = $category_id, invoice_status = 'Draft', invoice_amount = '$quote_amount', invoice_currency_code = '$quote_currency_code', invoice_note = '$quote_note', invoice_url_key = '$url_key', invoice_client_id = $client_id, company_id = $session_company_id");
 
@@ -6221,7 +6221,7 @@ if(isset($_POST['add_invoice_from_ticket'])){
         mysqli_query($mysqli,"UPDATE settings SET config_invoice_next_number = $new_config_invoice_next_number WHERE company_id = $session_company_id");
 
         //Generate a unique URL key for clients to access
-        $url_key = keygen();
+        $url_key = bin2hex(random_bytes(78));
 
         mysqli_query($mysqli,"INSERT INTO invoices SET invoice_prefix = '$config_invoice_prefix', invoice_number = $invoice_number, invoice_scope = '$scope', invoice_date = '$date', invoice_due = DATE_ADD('$date', INTERVAL $client_net_terms day), invoice_currency_code = '$session_company_currency', invoice_category_id = $category, invoice_status = 'Draft', invoice_url_key = '$url_key', invoice_client_id = $client_id, company_id = $session_company_id");
         $invoice_id = mysqli_insert_id($mysqli);
@@ -6834,7 +6834,7 @@ if(isset($_GET['force_recurring'])){
     mysqli_query($mysqli,"UPDATE settings SET config_invoice_next_number = $new_config_invoice_next_number WHERE company_id = $session_company_id");
 
     //Generate a unique URL key for clients to access
-    $url_key = keygen();
+    $url_key = bin2hex(random_bytes(78));
 
     mysqli_query($mysqli,"INSERT INTO invoices SET invoice_prefix = '$config_invoice_prefix', invoice_number = '$new_invoice_number', invoice_scope = '$recurring_scope', invoice_date = CURDATE(), invoice_due = DATE_ADD(CURDATE(), INTERVAL $client_net_terms day), invoice_amount = '$recurring_amount', invoice_currency_code = '$recurring_currency_code', invoice_note = '$recurring_note', invoice_category_id = $category_id, invoice_status = 'Sent', invoice_url_key = '$url_key', invoice_client_id = $client_id, company_id = $session_company_id");