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MEGA uses RSA encryption for sharing node keys between users, to exchange a session ID with the user at login and in a legacy key transfer for the MEGA chat.Įach user has a public RSA key \(pk_ \mod (p-1)(q-1)\).Īs shown in the key hierarchy MEGA clients encrypt the private keys for sharing, chat key transfer, and signing with the master key using AES-ECB.įurthermore, file and folder keys also use the same encryption.Ī plaintext recovery attack lets the adversary compute the plaintext from a given ciphertext. The private asymmetric keys and the node keys are encrypted by the client with the master key using AES-ECB and stored on MEGA’s servers to support access from multiple devices.Ī user on a new device can enter their password, authenticate to MEGA, fetch the encrypted key material, and decrypt it with the encryption key derived from the password. The encryption key encrypts a randomly generated master key, which in turn encrypts other key material of the user.įor every account, this key material includes a set of asymmetric keys consisting of an RSA key pair (for sharing data with other users), a Curve25519 key pair (for exchanging chat keys for MEGA’s chat functionality), and a Ed25519 key pair (for signing the other keys).įurthermore, for every file or folder uploaded by the user, a new symmetric encryption key called a node key is generated. The authentication key is used to identify users to MEGA. Key HierarchyĪt the root of a MEGA client’s key hierarchy, illustrated in the figure below, is the password chosen by the user.įrom this password, the MEGA client derives an authentication key and an encryption key. We challenge these security claims and show that an adversarial service provider, or anyone controlling MEGA’s core infrastructure, can break the confidentiality and integrity of user data. MEGA advertise themselves as the privacy company and promise User- Controlled end-to-end Encryption (UCE).
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What sets them apart from their competitors such as DropBox, Google Drive, iCloud and Microsoft OneDrive is the claimed security guarantees: With over 250 million registered users, 10 million daily active users and 1000 PB of stored data, MEGA is a significant player in the consumer domain. Any and all support will be appreciated.MEGA is a cloud storage and collaboration platform founded in 2013 offering secure storage and communication services. I tested downloading something with an incognito tab and it allowed me to download it without issues as before, so now I'm thinking that it has something to do with my actual browser, but I have no idea what. We've been having a back and forth conversation and I've done everything they suggested, reloading my account, clearing cache, completely clearing everything about mega etc etc etc. Before you say that I have to contact mega themselves, I have. Essentially, when I try to download anything using mega, be it files that people have shared with me or even my own cloud files, it says that I need a decryption key (that wasn't set on the folder, meaning there is no decryption key) or it just reloads the site. I've always used it before without any issues nor problems, but recently I've come to a problem.
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mega allows you to essentially share files, be it music, pictures, videos etc. For the past few weeks, I've been attempting to download things from mega.nz.