Dan Goodin reports:
In the decade since larger-than-life character Kim Dotcom founded Mega, the cloud storage service has amassed 250 million registered users and stores a whopping 120 billion files that take up more than 1,000 petabytes of storage. A key selling point that has helped fuel the growth is an extraordinary promise that no top-tier Mega competitors make: Not even Mega can decrypt the data it stores.
Research published on Tuesday shows there’s no truth to the claim that Mega, or an entity with control over Mega’s infrastructure, is unable to access data stored on the service. The authors say that the architecture Mega uses to encrypt files is riddled with fundamental cryptography flaws that make it trivial for anyone with control of the platform to perform a full key recovery attack on users once they have logged in a sufficient number of times. With that, the malicious party can decipher stored files or even upload incriminating or otherwise malicious files to an account; these files look indistinguishable from genuinely uploaded data.
Read more at Ars Technica.