Study on how to perform End-to-End File Encryption (large file) for a website

Hey there, I can tell you right away that it could be achieved with javascript and the html5 file api. What do you count as a "big" file? You can crash the browser with 10mb file sometimes. But i assume that you are talking about as big as 1gb or so. Anyway the encryption itself takes place on chunks of the whole file. I'd gladly provide an examples, And we can create a module according to your needs if you need one. Cheers

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Hello. As far as I know, in order to transfer big encrypted files you need: 1) direct access to local file system on client side (Java application or Javascript as browser add-on) 2) use data transfer via smaller chunks (one process reads file from local storage by parts, each part is encrypted and transferred to server, then server decrypts each part and save them consequently to a file) 3) use socket instead of XHR requests (this simplifies to avoid possible mess with chunks) But why do you need to use file encryption when HTTPS propocol can do this well by default? BR, Andrew

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Hi, We have experience in developing both the front-end and the back of web applications. If you want to achieve "zero knowledge" you could use an asymmetric key algorithm like RSA. However this is inefficient performance-wise for large files. The standard way of doing things (the way https does it) is to use a public-private key algorithm to exchange a key for a symmetric algorithm, and then use the symmetric key for the rest of the communication. I have a question: Do you want the received files to remain encrypted once they get to the server? By that I mean if the file is encrypted only during transfer or if the file remains encrypted on the server as well (only the holder of the key could decrypt it) P.S. As a side-note I have implemented RSA in JavaScript as part of a previous project

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hi, I heard about the zero visibility in end to end communication which seems to be the same what u r saying .lets discuss Abour the work. regards xuvtechnologies