If you would like to track the standardization effort, efforts are currently underway at IETF CFRG to standardize the Oblivious Pseudorandom Functions underlying the cryptographic security of Privacy Pass. Once you've got the extension installed, click here (or on any hCaptcha-using website) to earn passes:Īnd that's it! Your online browsing is now more private. As of version 2.0.3, you can redeem these tokens on websites using hCaptcha. Then, visit any website using hCaptcha and solve a captcha. Make sure you've enabled the extension in incognito mode. Getting startedįirst, install the extension for Firefox or Chrome. You can not get or redeem hCaptcha Privacy Pass tokens to bypass the hCaptcha service as used by Cloudflare, since Cloudflare issues and redeems its own Privacy Pass tokens. * In other words: you can get hCaptcha Privacy Pass tokens on, and use them on other sites directly using. For the moment, however, please follow the instructions below. This will eventually render the extension unnecessary.
The blinding procedure means that signed and redeemed tokens are cryptographically unlinkable from hCaptcha's perspective, and thus user privacy is preserved.Īs the IETF standardization process continues, we expect major browsers will adopt some form of Privacy Pass natively. When the user visits a site using hCaptcha and needs to pass the challenge (whether invisible or via the "I am human" button) they are redeemed automatically. These tokens are unblinded and stored by the extension for future use. The extension generates passes containing cryptographically blinded tokens that are signed by hCaptcha when a challenge is solved on any site using the hCaptcha service, except challenges shown on other Privacy Pass-supporting services that also embed hCaptcha, e.g. How it works: a browser extension provides users with the ability to create and sign cryptographically blind tokens for websites that support the Privacy Pass protocol. Privacy Pass is an emerging standard for preserving user privacy that we are developing in conjunction with Cloudflare and others.
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