What is No Homo-Graph?

No Homo-Graph is a Chrome extension developed by em_te, and its main feature is "Checks for homo-graphs in the domain name of the current website to prevent phishing.".

Extension Screenshots

Download No Homo-Graph Extension CRX File

Download No Homo-Graph extension files in crx format, manually install Chrome extensions in the browser, or share the crx files with friends to easily install Chrome extensions.

Extension Usage Instructions

About this Add-on
Using computer algorithms, No Homo Graph checks in real-time to see if websites you visit are spelled similar to a user-defined list of domains. If similar matches (a.k.a. homo-graphs) are found, a modal dialog is shown preventing you from interacting with the website until you indicate awareness of the risks involved. The modal dialog is modal to the website only and doesn't prevent you from switching tabs or replacing it with another website altogether. The user-defined list of domains is populated with popular domains like PayPal, Western Union, Google, Yahoo, MyEtherWallet and MoneyGram and the user is free to add and remove from the list.

For example, it will catch things like "paypaᶘ.com" if you have "paypal.com in your list.

How No Homo Graph Works
When you visit a website, this add-on parses the second-level and third-level domain from the URL and calculates the difference between them and the domains in your user-defined list. If the domains are puny-code encoded, they will be converted to Unicode. If the domains contain Cyrillic characters that look like Ascii characters, they will be converted into Ascii. If the difference is below a threshold (2 permutations if the domain is less than 7 characters excluding the TLD), it will alert the user that a match was found.

What are the Limitations?
This add-on is not fool-proof. An attacker can simply make more changes to the domain until it is different enough. But then it becomes easier to spot with the naked eye.

How is my Information Stored?
All info is stored locally on your computer.

What are Homo-Graph Attacks?
See these links:
https://slashdot.org/story/02/05/28/0142248/spoofing-urls-with-unicode
https://dev.to/loganmeetsworld/homographs-attack--5a1p

Example attacks:
https://xn--80aa0cbo65f.com (fake paypal.com)
https://www.xn--80ak6aa92e.com (fake apple.com)
http://www.xn--o1aae.com (fake cnn.com)

Extension Basic Information

Name	No Homo-Graph
ID	knkgpopkjopfceiagfeneimdpeeiffej
Official URL	https://chromewebstore.google.com/detail/no-homo-graph/knkgpopkjopfceiagfeneimdpeeiffej
Description	Checks for homo-graphs in the domain name of the current website to prevent phishing.
File Size	33.95 KB
Installation Count	75
Current Version	0.2.5
Last Updated	2020-03-22
Publish Date	2020-03-19
Developer	em_te
Email	[email protected]
Payment Type	free
Privacy Policy Page URL	https://em-te.github.io/privacy
Supported Languages	de,en,nl,es,ru,zh-CN,ja,ko
manifest.json
{ "update_url": "https:\/\/clients2.google.com\/service\/update2\/crx", "name": "__MSG_extensionName__", "author": "Terry Yuen", "version": "0.2.5", "description": "__MSG_extensionDescription__", "manifest_version": 2, "default_locale": "en", "icons": { "16": "icon_16.png", "24": "icon_24.png", "38": "icon_38.png", "48": "icon_48.png", "96": "icon_96.png" }, "permissions": [ "", "activeTab", "webNavigation", "storage" ], "background": { "scripts": [ "punycode.js", "background.js" ], "persistent": true }, "page_action": { "default_icon": { "16": "icon_16.png", "24": "icon_24.png", "38": "icon_38.png", "48": "icon_48.png" }, "default_title": "__MSG_pageActionTitle__", "default_popup": "popup.html" }, "options_ui": { "open_in_tab": true, "page": "settings.html" } }