video file encryption, decryption and player development - 17/09/2018 15:51 EDT

Hello, I'm not sure how big are the mp4 files (because if they are too big, then maybe this is not the best solution). My idea is this: 1. We encrypt the files using the AES encription algorithm. You deliver it to the end users like that. To decrypt it, someone will have to know the pass code. 2. When the player starts, when a specific file is required to play, we decrypt it to a temp directory. Then play it decrypted, from the temp directory. After playback is finished we delete the decrypted file. 3. About the player itself. My idea is to do it using C# and DirectShow windows framework. This is older and well established framework on windows, that can playback, record video and audio files, with support of many video/audio formats. You didn't mentioned if there's gonna be audio in it, but it will not be a problem, because wide range of audio formats are supported too. The code will be completely in C#, well commented, so you can change it later. Little about me: I have 14+ years of experience in developing windows apps, in C++/C#. My special interest is multimedia, i.e. video/audio playback, capture, encoding etc. Best regards, Goran.

Hi, Will be developed in 1 day.... by "next file" you mean some sort of playlist type feature ? I have developed many file encryption/decryption codes

Hi. I'm professional programmer with experience over 20 years and I did such task. I have experience with creating own video player. Also I'm good at various video protocols. I can write this program on c# if you want. We can discuss details in chat. I will not say too many smart words just look my completion rate and see my feedbacks for evaluate my skills. Regards, Alex.

Hello, Your requirements are quite clear and straightforward to implement. Though I suggest to use a standard encrytpion algo, like aes, instead of rolling your own. That way rather than modifying the source code to modify the algo all together you'd simply just change the key used. No need to worry about the reverse engineering since that applies to both. In any case, no matter of what method/algo you use, an attacker determined enough will break it. So common approach for such situations is making the attackers' job as hard as possible but rolling your own algo won't make any difference. Still, it's your call and if you want to take that route it's totally fine. Player will decode the files in memory and just stream the decoded data to player which will play it like any other mp4 player. Speaking of which, I suppose you're aware of the mp4 licensing/patents. I'm not an expert on the subject at all but as far as I can remember it's all good if the number of viewers per year is below 100K or something. Since you want to utilize .net I assume you're targeting Windows 7 and above. If you have a specific .net version to target as well please let me know. As you've requested I'll use c# to implement both program. It'll take 10 days to implement both program. At the end of the project I'll deliver the source as a VS solution. I'll also provide guidance to modify the algo if you'd like. Thanks Aydin

hi, I have a ready made encrypted video player, you can encrypt a folder that contains the course video files, also the solution manage licence keys for days or date, I can send you a demo. the solution is in vb.net, the course videos are encrypted using a unique key. the solution have 2 programs, one for licence generation and video encryption and other program for the customer to play videos. chat me for solution pic, video or demo

Hello my name is Fares, i can get it done perfectly as you want let's chat when you are online,. Thanks

Hi This is just an first guess estimated price and timeframe based on my initial understanding of your requirements. Could you provide me some info like how do you distribute these files and how will you distribute the software to them ? If there are any upgrade hos do you plan to redistribute it ?? Please message me if interested and we can get started. Regards

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Hello I can do it very easily if you want. i am ready to do it right now. Please contact me reply to discuss more about this project

I can likely make this code in <40 hours, over 4 days. I took a computer security class while in University and would be very interested in testing out some more encryption. If you wanted to make it more secure, it would be worth while to create a separate program that links to the encryption in the first -> to add a new random variable that is determined by the input of the second program, and have a password that you create to run this program, opposed to changing any values in the original code. This would also rule out any errors when changing the encryption. Also willing to complete the original project with this addition as another MileStone.

Dear Good Customer; I will use SDES encryption algorithm because i did it in c language, I need to customize it to be capable for 5 bits input as cipher text okey. it should be also with public key. i will deliver simple GUI interface that only prompt you to enter public key for encrypt/decrypt the file in case you check decrypt you can option choose file format to play with it. let know what video format you need to paly with it. our application will include multi threading to handle your stop, forward,.. etc nice to hear from you about other details. Best regard abdalfattah

Hi, please see my profile...If you think that i can do your project then you give me a task related in your project after that you can select. Thanks

Video file can encrypt as you described. If you want to play the encrypted video though the 2nd software (the player). It will be decrypt the file into a temp file folder or similer location before it plays. so some delay could happen because of the file size.