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Cryptex | E-Mail Address Protection


NOTE: this plugin is targeted to advanced users and professionals – it requires some configuration tasks and won’t work out-of-the-box!

The plugin is used to display Email addresses as an image – automatically.
This will stop harvesters and crawlers from gathering sensitive data from your website.
It works with emails, telephone numbers, postal addresses or any other text-content.
Just wrap your E-Mail-Address into a shortcode like [email][/email] – that’s it.
Or use the Autodetect filter to transform every E-Mail-Address on your page automatically into an image!

Plugin Features

  • Protects Email Adresses, Telephone Numbers or any other content
  • Fully customizable appearance: you can configure font-family, font-size and font-color – everything looks like your theme style
  • Retina/HD/High-Dpi Images – best appearance on all devices (2x, 3x or 4x resolution enhancement)
  • Shortcode and/or Autodetection usage!
  • Build-In E-Mail-Address-Autodetection – all addresses on your page are protected automatically (if you want it – you can also just use shortcodes!)
  • Autodetection filters configurable for the_content, the_excerpt, comments, comments_excerpt, text-widget
  • Reversible Address-Autodetection Process – your content is modified as long as the plugin is activated
  • Postal-addresses, telephone-numbers, names and other sensitive information`s can be protected too
  • Protects E-Mail hyperlinks (mailto) by using javascript based key-shifting encryption/decryption with dynamic keys – but you can use images only
  • Suitable for high traffic sites – automated caching of dynamic generated images and CSS
  • Automatic font-search (standard system font-paths)
  • Supports the new modern UI style of WordPress 3.8
  • Native support for Enlighter Syntax Highlighter to display E-Mail Addresses within highlighted content (requires Enlighter v2.7)
  • Includes the Liberation(tm) Fonts package
  • TrueType as well as OpenType Fonts are supported


The @-sign as well as dot’s within the e-mail-addresses can be automatically replaced by different placeholders, e.g. mail(at)example{dot}org, to match your website’s corporate design.

Security Modes

Cryptex provides various obfuscation modes for E-Mail-Addresses:

  • Plain Text – only text-transformations are applied – no use of images
  • Single Image – the e-mail-address is expressed as a single image
  • Multipart Image – the e-mail-address is splitted into two images, seperated by the @-sign in plain text
  • Advanced Multipart Image – the craziest one: each part (divided by dot’s and @ sign) is displayed as a seperate image, the dividers as plain text


  • Cryptex Website Appearance
  • Settings Page – Contextual Help Menu
  • Settings Page – Appearance
  • Settings Page – Autodetect Filters & CDN Options
  • Settings Page – System Informations
  • Settings Page – Image Offsets & Retina/HighDpi Options


System requirements

  • PHP 5.4 or greater
  • GD library (v2.0.28 or greater)
  • GD PNG support
  • FreeType2 (optional, required for OpenType fonts)
  • Accessible cache directory (/wp-content/plugins/cryptex/cache/ or a custom one)

WordPress Theme requirements

  • The wp_footer and wp_head action have to be used (enqueue js+css resources)


  1. Upload the complete cryptex folder (WordPress Plugin) to the /wp-content/plugins/ directory
  2. Gaitu plugina WordPress-eko ‘Pluginak’ menutik
  3. Go to Settings -> Cryptex and check all items into the sidebar.
  4. In case that there are no font available on your server you can use own/special fonts by uploading them into the /wp-content/plugins/cryptex/fonts/ directory
  5. Go to the appearance section and select the font-family, font-color and font-size like the styles in your theme
  6. That’s it! You’re done. You can now enter the following code into a post or page to protect email addresses: [email][/email]. Or use the Autodetect feature


Cryptex Shortcode doesn’t work in Text-Widgets

Generally, WordPress does not process any shortcodes used in text-widgets. You can add the following code to your template functions.php file to enable shortcode processing: add_filter('widget_text', 'do_shortcode');

I get an error using the system font paths, which are shown by the settings page

This paths – depending on your hosting environment – can be different – if you don’t know the path, please ask your hosting provider or upload the fonts manually into the cryptex-plugin-directory \wp-content\plugins\cryptex\fonts\ and use Plugin Directory as font source.

I get a “file permission” error changing the font source to **Custom Directoy**

During security restrictions your system font paths could be unaccessable. In this case you have to upload TrueTypeFonts (.ttf) into the cryptex-plugin-directory \wp-content\plugins\cryptex\fonts\ and use Plugin Directory as font source.

I get an “file permission” php error in my blog

The directory /wp-content/plugins/cryptex/cache/ must be writeable – the images as well as the generated css file will be stored there. Try to set chmod to 0644 or 0770

I need bold/italic font styles

Please use the italic/bold font of the font family you’ve selected. For example there is an verdana.ttf(normal) and verdanai.ttf(italic) file!

Is it possible to use Cryptex directly in my wordpress template ? shortcode does not work yet

Of course! you can simply use <?php Cryptex::crypt('yourtext'); ?> to display ‘yourtext’ as crypted version

I miss some features / I found a bug

Send an email to Andi Dittrich (andi _D0T dittrich At a3non .dOT org) or or open a New Issue on GitHub


2018(e)ko abuztuaren 25(a)
This is a fairly good and not too complicated plug-in which does a good job at scrambling e-mail addresses automatically on WP sites. Load the fonts you use and it can be fine-tuned to blend very well into the website. It may require a bit of work to fine-tune it to perfection, but it is well worth the efforts. This is not the plug-in for those who just wants something which works without any efforts. But the scrambling it does is well worth the effort.
Irakurri 5 berrikuspenak

Laguntzaileak eta Garatzaileak

“Cryptex | E-Mail Address Protection” software librea da. Ondoko pertsonek egin dizkiote ekarpenak plugin honi.


Aldaketen loga


  • Added: Full srcset highdpi support (all images generated in the required resolution)
  • Added: Number of cached files to the settings page
  • Added: about-page inlcuding html changelog
  • Added: redirect to about-page on plugin activation/upgrade
  • Added: debug tab to the about-page containing the full plugin configuration
  • Changed: replaced dedicated colorpicker by build-in WordPress iris picker
  • Changed: plugin settings splitted into multiple pages
  • Changed: image dimensions of high resolution images are not cached anymore (performance)
  • Changed: HTML5 srcset based HDPI renderer is set as prefered option
  • Changed: moved plugin files into modules/ directory as required by wp-skltn
  • Changed: set default line-height to 20px instead of auto
  • Changed: set default padding to 4px
  • Changed: wp-skltn library updated to 0.17.0 – MPL 2.0 License
  • Bugfix: added width attribute to html-srcset highdpi images (causes invalid dimension on iOS devices)


License changed to GNU GENERAL PUBLIC LICENSE Version 2 (GPL-2.0)

  • Added: option to disable generic cryptex shortcode
  • Added: cryptex icon batch to settings page
  • Added: docker based development mode
  • Changed: moved settings page to top-level menu
  • Changed: new settings page
  • Changed: wp-skltn library updated to 0.13.0 – MPL 2.0 License
  • Changed: sessionStorage is used to store the current active tab instead of cookies
  • Changed: updated the UI components
  • Changed; email/telephone shortcodes are enabled by default
  • Changed: 3rd party plugin support (placeholders) are disabled by default
  • Removed: jquery-cookie dependency
  • Bugfix: telephone/email shortcodes caused a php warning in case no attributes were set – thanks to jotazzu on GitHub
  • Bugfix: colorpicker sets wrong foreground color which caused unreadable input fields (color lightness calculation)
  • Bugfix: settings label (checkboxes) were not linked to the input elements


  • Added: WordPress Multisite support
  • Added: New Environment Check to ensure Cryptex is working in a well configured environment
  • Added: Support for telephone numbers including uri scheme tel:
  • Added: Shortcode telephone
  • Added: href Shortcode attribute to override the default behaviour
  • Added: Plugin Upgrade Notification
  • Changed: WP-Skeleton is used as Plugin Backend Framework
  • Changed: All settings are stored in serialized form in cryptex-options instead of single options
  • Changed: Settings Page URL to wp-admin/options-general.php?page=Cryptex
  • Changed: Base64 Filename hashes are used instead of hexadecimal ones
  • Replaced: PHP-Version-Errorpage by global admin_notice – ensure that PHP 5.3 or greater is used to avoid weird errors
  • Bugfix: The cache accessibility check did not work on WIN platform
  • Bugfix: Fixed some CSS rules used in Settings-Page
  • Cleaned up the internal Plugin Structure


  • Changed: the default font-file to LiberationSans-Regular.ttf
  • Replaced: the low-level PHP based ObjectCache by the WordPress Transient API
  • Bugfix: Fatal Errors thrown in environments with missing imageantialias() GD function are suppressed by additional check


  • Added: Plugin Upgrade notifications fo major releases to the admins plugin page
  • Added: Some unit testcases (development only)
  • Bugfix: Email Address autodetection failed in some cases – thanks to topotato on GitHub


  • Added: New Javascript decryption engine (size optimized – 827bytes)
  • Added: Support for Enlighter Syntax Highlighter to display E-Mail Addresses within highlighted content (requires Enlighter v2.7)
  • Added: Invisible placeholders around the html output (required for Enlighter)
  • Added: Global Javascript Object Cryptex
  • Added: Liberation(tm) Fonts package
  • Added: Additional HDPI Image renderer based on the HTML5 srcset attribute
  • Added: Settings page link to the plugin page (metadata row)
  • Added: Link to author’s Twitter Channel (latest Enlighter updates/news)
  • Added: Option to set the CSS Font-Family (in case you want to use another font for Email addresses on your page)
  • Changed HTML output attribute ordering
  • Removed: MooTools + jQuery code – replaced by native version
  • Removed js-type option – Cryptex javascript is now always injected into the page (wp_footer action)
  • Removed external CSS option – the required CSS is now always injected into the page (wp_head action)
  • Bugfix: HDPI CSS container is now only added when cryptex images are found on the page
  • Bugfix: The contextual help link was not “full” selectable (covered by the tab nav)
  • Bugfix: Error handling of the FontManager failed (should never happen under normal conditions)
  • Bugfix: ObjectCache file existent check failed
  • The readme.txt (WordPress plugin repository) is generated from the markdown file and (GitHub style)


  • Added: Retina/High-DPI image support
  • Added: Option to set the line-height (image-height) manually
  • Added FreeType2 support, including .otc and .otf fonts – enabled by default
  • Added: Font-size can be set in px or pt – px value will be forced as default
  • Added: Autodetect filter to text-widget content (optional)
  • Added: Custom cache path/url settings like WordPress’ media options (advancved settings)
  • Added: Option to disable Antialiasing (advancved settings)
  • Added: New html+image rendering engines
  • Added: Width+Height attributes to generated image-tags (including server side caching)
  • Added: Additional user-role check (administrator + manage_options required)
  • Added: Tab-Panels to the settings page (Appearance, Options, Advanced)
  • Added: Contextual Help based help/informations
  • Added: Shortcode options to override the global cryptex-settings – feature requested on Forums
  • Added: Option to load stylesheet as inline content (style tag displayed in wp_footer)
  • Added: Option to include javascript, required for hyperlink-decoding, as inline content (script tag displayed in wp_head or wp_footer)
  • Added: Cleanup of generated stylesheets
  • Added: New Screenshots
  • Added: License Informations to settings-page footer
  • Added: Error supression for system-font scanning
  • Updated: MooTools Javascript code now uses document.getElements() instaed of leagcy $$() selector
  • Modified: Cryptex javascript file uses UglifyJS for minification
  • New settings page – now matches WordPress corporate UI style
  • Removed WordPress <= 3.7 compatibility mode/legacy UI style
  • Bugfix: Added some missing I18n namespaces
  • Many internal changes/improvements


  • Added: Option to enable processing of “Nested-Shortcodes” within cryptex/email tags – this might be useful if your using inner shortcode which fetches some content from your database, etc. (disabled by default)
  • Bugfix: E-Mail-Address-Autodetection doesn’t recognize subdomains (e.g.


  • Bugfix: CSS files doesn’t get generated on upgrading the plugin – you have to click “save settings” to force the creation on previuos versions


  • Added: Autodetection filters for get_the_excerpt, get_comment_text and get_comment_excerpt
  • Added: New Security-Mode “Advanced Multipart Image” – each part of the email-address (seperated by dot’s and @ sign) is displayed as an image, the dividers as plain text
  • Added: New Security-Mode “Text” – not recommended but usefull if you don’t want to use images (e.g. screenreaders required) – this setting will only modify the @sign of the text and adds mailto
  • Added: Option to enable/disable the_excerpt, the_content, get_comment_text and get_comment_excerpt autodetect filters
  • Added: Text-Replacement for the dot (.) within E-Mail-Addresses
  • Improved: Increased the robustness of the Font-Manager (font detection)
  • Improved: Font-List is now alphabetically sorted
  • Bugfix: Limited the total number of directories to be recursively scanned by the Font-Manager to 100. This will prevent plugin-crashes by e.g. scanning the whole filesystem. A minimum Font-Path length of 4 characters is also required (using root path / is now permitted)
  • Bugfix: Misspelled variable within Cryptex Main class (no influence)


  • Added: E-Mail-Address autodetection – transforms E-Mail-Addresses from post/pages directly into images without the need of shortcodes (optionally – you can turn it off on the settings page)
  • Added: I18n generation tools, including ANT build script
  • Added: German translation (de_DE)
  • Added: I18n can be disbaled
  • Added: Environment Pre-Check (PHP 5.3 requirement!)
  • Improved UI
  • Bugfix: Added missing I18n domains
  • Bugfix: Misspelled variable within image-hash generation (caused php error)


  • New plugin backend structure
  • PHP Namespaces used to isolate plugin (PHP >= 5.3 required!)
  • Improved settings page, new design
  • Improved E-Mail-Address detection
  • Many performance optimizations
  • Removed support for GD library version 1.x (>= v2.0.38 required)
  • Added: Support for new WordPress backend UI style
  • Added: Automated Font Search/Detection
  • Added: Shortcode-Alias [email] to be compatible with other plugins
  • Added: User defined dimension offsets for generated images
  • Added: FULL I18n support (internationalization)
  • Bugfix: Cache not cleared on activating plugin (required for updates)
  • Bugfix: Closed possible attack vector on image filenames by decoding the used sha1 hashes – now a unique salt is used to prevent it
  • Bugfix: Invalid px/pt transformation used for GD1/2 interoperability
  • Bugfix: Wrong css cursor was used for divider (@ sign) using hybrid mode


  • Complete rewritten version of the plugin. Completly cleaned, strict OOP coding style
  • Bugfix: removed cryptex js+css from wordpress admin pages
  • Bugfix: pointer cursor is only visible on active hyperlinks
  • Improved: you can add css prefixes to fix problems with some themes without editing your theme css
  • Improved: only 1 css file is added instead of 2 files like before
  • Improved: new plugin directory structure
  • Added: I18n (internationalization) is supported
  • Added: you can select the method cryptex uses to display email addresses (single image, hybrid image)
  • Added: if you wanna use cryptex directly in your wordpress template, you can simply use Cryptex::crypt('yourtext'); to display ‘yourtext’ as crypted version


  • Bugfix: (websites without JQuery or MooTools) using Cryptex on more than one e-mail address per page failed: when any of the e-mail addresses getting clicked, the address from the last address gets applied to all of the links. (Thanks to Kory S.)


  • Bugfix: by some misunderstanding of the WordPress API the update/upgrade/installation of any plugins triggered the restore/backup events of cryptex – this may be cause a “permission denied” error message during the installation of any plugin. I apologize for this inconvenience
  • Improved: dynamic CSS file is automatically generated on activating the plugin
  • Improved: suppress error messages if there is no GD-library


  • Bugfix: restore of font folder cryptex/fonts failed on upgrade (windows servers..)


  • Bugfix: restore of css files failed on upgrade
  • Bugfix: CSS file only updated after second press on “save changes”
  • Bugfix: color parsing error – colors like 0x0000ff not parsed correctly
  • Bugfix: CSS font family failure on dynamic generated files
  • Added: button to restore default font path \wp-content\plugins\cryptex\fonts\
  • Added: jQuery ColorPicker to settings page
  • Added: support for custom text in cryptex shortcode (like telephone numbers, postal addresses)
  • Improved: new plugin directory structure – moved js+css files


  • Bugfix: restore of font folder cryptex/fonts failed on upgrade


  • First public release.