| Hello and welcome to the Computerworld UK Weekly Digest. This week started with what looked to be another major data breach for a well-known UK brand. On Wednesday, retailer Superdrug contacted a selection of customers it suspected to have been affected, asking that they change their passwords. The story wasn't that straightforward however, with details emerging that this was more of a hoax than a hack. This technique is known as credential stuffing, where stolen logins and passwords from one website are used to gain access to user accounts on another as a means of extorting money from the 'affected' organisation, and this could be the first example of hackers looking to take advantage of organisation's anxiety over GDPR compliance in order to extract a ransom. Elsewhere we wrote a lengthy piece on handy tips for keeping cloud costs down across increasingly complex IT environments, as well as our usual batch of case studies, including how the retailer AO.com built a single view of its customers using MongoDB technology. Lastly we have a new roundup of how financial services organisations are disproportionately targeting blockchain use cases, and why the CRM giant Salesforce open sourced the technology behind its machine learning platform. | 
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