Creating a file sharing application, File-sharing programs are numerous (WeTransfer, OneDrive, Dropbox). The secrecy of the data that passes through these platforms is ensured, but how? 안전한 카지노사이트
For whatever reason, servers receive a direct copy of the files. As long as HTTPS is being used, SSL/TLS is often used as the primary form of security.
Though the file is frequently kept “in clear” once it has been delivered to the server. An administrator or developer might therefore read them.
This is similar to the previous vulnerability discovered in Log4j, which would allow a malevolent individual
(a hacker, for instance) to read them if they had penetrated the application’s security.
End-to-end encryption is a technology that has the potential to provide a solution. It enables the cryptographical security of a file, allowing only authorized users to access the file.
This necessitates the creation of encryption and decryption key pairs on the users’ devices, which can be quite challenging for a developer in terms of difficulty and security risk.
By utilizing a cryptographic library that handles this, the Seald SDK (accredited by the ANSSI) enables developers to completely ignore this complexity.
In this post, we’ll look at how to add end-to-end encryption to a file transfer program.
These are the options we have for technology:
- We’ll utilize Django and the django-rest-framework on the backend;
- Combine React and JavaScript on the front end.
- This manual is “high level,” and the entire code is simple to translate into other languages, provided that the client component (in this case, the frontend) can run JavaScript.
Application requirements
This manual’s example application will be a file sending/receiving website.
The application’s workflow is as follows:
- An individual may sign up for the application;
- A file can be sent to a registered receiver by another individual (who is not necessarily registered);
A user who has been authenticated can view and download the files he has received.
This guide does not cover how to create such an application. We shall only pay attention to the particulars of end-to-end encryption of files during transmission and download.
So here is a summary of this manual:
During registration, a user’s cryptographic identity will be created;
Only the person who will be getting the material will have access to the encrypted files that are sent to the server;
The user who is getting the files will be able to decrypt and download them.
All of this is done at every stage of the original workflow in a totally transparent manner.
Making a Seald project
To generate API keys, you must first register an account before using Seald SDK.
To do this, you just need to register on the account creation page.
Upon registration, various API keys (we’ll name them SEALD APP ID, SEALD VALIDATION KEY ID,
And SEALD VALIDATION KEY) will be generated. 카지노사이트
Creating a file sharing application, Apikey
Once these API keys have been created, it is advised to create a personal access token as well, enabling API manipulation of the dashboard.
Create one under the “Personal Access Tokens” page in the dashboard settings to generate one.
In order to produce licenses for users, this token will enable the creation of a shared secret between the backend of our application and Seald.
We must use the command listed in the documentation to create a shared secret:
They are necessary for the remainder of this manual.
creating an identity in cryptography during registration
The first step in the entire workflow when integrating end-to-end encryption into an application is to create cryptographic keys for the user after registration.
You use these keys to:
- Use the “public” portion of these keys to secure documents when sending them to users;
- Use the “private” portion of the key when the user wants to decrypt a document.
When one builds these features himself, the challenge is integrating:
the keeping of private keys outside the application’s purview so that the user can access them later on a different device;
The key renewal process.
By utilizing Seald, all of these security measures are set up in the library without any additional bother on your part.
A cryptographic identity is the collective name for this set of keys.
Several transactions between the backend and the frontend must be merged in order
To generate the encrypted identity. This generation can be categorized basically as follows:
A Seald SDK license token is created by the backend and sent to the frontend;
- The frontend creates the encrypted identity;
- The backend receives the Seald ID from the frontend.
Sending a file encrypted to the server
It will be possible to obtain a user’s cryptographic identity once it has been formed so that another user can use it to encrypt documents.
Returning to our upload application now. In our situation, we want everyone (even an anonymous user)
To be able to transmit a file to a registered user. So, we’ll employ anonymous encryption.
The user needs the following in order to encrypt a communication anonymously:
- the recipient’s Seald identification, who should receive the file;
- an encryptionToken that the server is capable of producing.
Creating a file sharing application, A file on a user’s computer being decrypted
The recipient user now wants to read the file after it has been encrypted and stored on the server. 카지노 블로그
Use seald.decryptFile after the seald variable has been initialized (either through identity creation or authentication) ().
Therefore, it will be essential to first decrypt the file in order to force the user to download it rather than simply
Connecting to the file’s download URL. We carry out the following actions on the frontend to achieve this: