Android Question Whats the best practice for encrypting a log file?

[ernschd]

Hello,

In our app, a log file is to be written for security purposes, in which the database queries are stored in order to read them into a sqlite if required.
To prevent unauthorized access to this data, the log file is to be encrypted. The decryption must be possible on a (Windows) PC.
A problem could be that the file is probably opened quite often for writing, therefore the process must not take too long.

Does anyone have an idea for the best way to do this?

Regards

 

[toby]

You have two options
1. use B4XEncryption to create a B4A app and a B4J app which runs on your Windows pc

[B4X] B4XEncryption

This library allows you to encrypt or decrypt data using the AES encryption method. It is simple to use and it is compatible with B4J jB4XEncryption library and B4i Encryption library (Encrypt and Decrypt method) which means that you can encrypt the data on one platform and decrypt it on a...

www.b4x.com

2. Use Use B4XEncryption in your B4A app and B4XEncryption.net DLL in your PC app

B4XEncryption .net DLL class library

Hi All, I recently had the need to send encrypted data from my B4A/B4J/B4i apps to a .net web service. Because the B4XEncryption library works in all the B4X environments, I wanted a way to decrypt and encrypt data in the same way as the B4XEncryption libraries do. Details of the B4XEncryption...

www.b4x.com

 

[Erel]

The way I would have done it is by encrypting each block(?) of logs separately, write the encrypted bytes length and then the encrypted bytes.
On the PC you need to read the length of each block, read the block and decrypt it.

Writing the logs will be fast as you don't need to encrypt the whole data.

Example of encrypting / decrypting large files in chunks: https://www.b4x.com/android/forum/t...encryption-and-decryption.114141/#post-713166
This is not exactly the same case as this one.