Internet giants to block child porn images using a common list

Google, Facebook and Twitter are among the companies that will block child sexual abuse images, using a hashed list

Fingerprint reader on laptop

Fingerprint reader on laptop

Facebook, Google, Twitter, Yahoo and Microsoft will take a new step toward combating the spread of child pornography, by blocking images identified in partnership with an industry group.

The companies will block images of child sexual abuse that have been identified by the Internet Watch Foundation, a U.K.-based nonprofit that aims to locate and stamp out such content online. The effort is aimed at speeding up the identification and removal of images of child sexual abuse worldwide, and preventing them from being uploaded in the first place.

Only known child sexual abuse images identified by the IWF will be blocked. Each company will download a list of images that have been "hashed" by IWF analysts, under a process that creates a digital fingerprint of each image. The hashes are created from images that IWF's analysts have assessed, which come from various online sources like reports from the public, and the U.K.'s Child Abuse Image Database.

Hashing the images is designed to make it easier for sites to identify them quickly amid vast amounts of other content.

The effort allows for potentially larger numbers of images to be blocked on some of the Internet's most trafficked sites. On an average, IWF said it removes around 500 URLs each day, with each URL containing one to thousands of child sexual abuse images.

Many different Internet companies could potentially make use of the hashed list, IWF said Monday in its announcement. Any company that provides services like image search and storage, hosting services, or social media and chat could use the list to identify and remove the images or prevent them from being shared.

Facebook, Google, Microsoft, Twitter and Yahoo are five IWF member companies using the list so far. Over time, the list will be rolled out to all eligible members, the group said.

Some Internet companies have already been using image hashing technology developed by Microsoft to automatically identify and block child pornography. Microsoft's technology, called PhotoDNA, is designed to identify images even if the image has been altered. Facebook has been using it since 2011 to prevent the upload of known child pornography images.

IWF's system uses PhotoDNA as well as other hashing techniques.

Still, experts say there are challenges tied to hashing. Changes in the image, like a crop or resize, can still quash the detection.

IWF does not hash video, although the group says they're developing video hashing software.

Each of the participating sites will download an updated hash list daily, IWF said. It's designed to proactively scan the sites for the known images.

Zach Miners covers social networking, search and general technology news for IDG News Service. Follow Zach on Twitter at @zachminers. Zach's e-mail address is zach_miners@idg.com

Join the newsletter!

Or

Sign up to gain exclusive access to email subscriptions, event invitations, competitions, giveaways, and much more.

Membership is free, and your security and privacy remain protected. View our privacy policy before signing up.

Error: Please check your email address.

Tags social mediainternetGoogleFacebooktwittersearch enginessocial networkingInternet-based applications and servicesInternet Watch Foundation

Keep up with the latest tech news, reviews and previews by subscribing to the Good Gear Guide newsletter.

Zach Miners

IDG News Service
Show Comments

Father’s Day Gift Guide

Brand Post

Most Popular Reviews

Latest Articles

Resources

PCW Evaluation Team

Tom Sellers

MSI P65

This smart laptop was enjoyable to use and great to work on – creating content was super simple.

Lolita Wang

MSI GT76

It really doesn’t get more “gaming laptop” than this.

Jack Jeffries

MSI GS75

As the Maserati or BMW of laptops, it would fit perfectly in the hands of a professional needing firepower under the hood, sophistication and class on the surface, and gaming prowess (sports mode if you will) in between.

Taylor Carr

MSI PS63

The MSI PS63 is an amazing laptop and I would definitely consider buying one in the future.

Christopher Low

Brother RJ-4230B

This small mobile printer is exactly what I need for invoicing and other jobs such as sending fellow tradesman details or step-by-step instructions that I can easily print off from my phone or the Web.

Aysha Strobbe

Microsoft Office 365/HP Spectre x360

Microsoft Office continues to make a student’s life that little bit easier by offering reliable, easy to use, time-saving functionality, while continuing to develop new features that further enhance what is already a formidable collection of applications

Featured Content

Product Launch Showcase

Don’t have an account? Sign up here

Don't have an account? Sign up now

Forgot password?