Landmark data sharing agreement to help safeguard victims of sexual abuse imagery

12 Dec 2019 Angela Munoz Aroca

Beginning today, the Internet Watch Foundation will now share its known hashes of child sexual abuse imagery (digital fingerprints) with internet companies in the United States and beyond, through a platform hosted by the National Center for Missing & Exploited Children.

This is a giant step forward in the continuing effort to provide internet companies around the world with greater access to a larger pool of hashes to stop the upload, sharing and storage of this criminal imagery on their platforms.

The non-profit, NCMEC, operates the CyberTipline, a centralized reporting system for the online sexual exploitation of children. The CyberTipline also functions as a global hub for hash-sharing with internet companies around the world. With the addition of IWF’s hashes, NCMEC’s platform now contains more than 3.5 million hashes of child sexual abuse imagery.

IWF generates and collates for industry’s use PhotoDNA (pDNA) hashes of child sexual abuse images.

All pDNA hashes owned by the IWF are now available through NCMEC’s platform whilst continuing to be available direct to IWF Members. IWF also continues to provide hashes in other formats directly to its membership.

Internet companies can have confidence that all the hashes contributed by IWF have been verified by IWF – which is a body independent of government and police – as child sexual abuse material and graded according to internationally-recognised standards.

IWF CEO & UKSIC Director Susie Hargreaves OBE said: “This will be the biggest quality-assured database of child sexual abuse hashes in the world.

“The IWF-NCMEC collaboration has been inspired by our joint determination to make it as easy as possible to remove child sexual abuse images for the benefit of the victims pictured.

“Child sexual abuse material is a global issue which knows no geographical boundaries. This hash sharing agreement joins up efforts to ensure that the best service is given to victims of sexual abuse, and the best efforts are made by NGOs and internet companies to rid the internet of duplicates of child sexual abuse images. 

“We’re thankful to all our Members who fund our work that’s so vital to finding the imagery and creating the hashes which contributes to the broader global efforts protecting victims.” 

IWF actively searches the internet for new and duplicate images of child sexual abuse, as well as takes reports from the public, police and internet companies. This means new imagery is found daily, and therefore the list of hashes grows on a daily basis. There are currently more than 420,000 unique hashes on the IWF list.

“The expanded partnership and addition of IWF’s hashes to the NCMEC platform is groundbreaking,” said John Clark, president and CEO of NCMEC. “This will go a long way in ensuring the safety of children around the world.

“Two of the largest organizations working to combat the online sexual abuse of children are joining forces to make sure survivors of this horrific abuse have some peace of mind that there are increasing safeguards in place to reduce the amount of content being circulated online. This agreement is a game-changer and we look forward to other organizations joining the effort to share hashes to combat this global epidemic.”

For more information about the important work the IWF do eliminating child sexual abuse imagery online, please visit

The IWF is a partner in the UK Safer Internet Centre, working with Childnet International and SWGfL to promote the safe and responsible use of technology for children and young people.

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