Secret Message Application – In the previous chapter, I introduced you to steganography and showed how secret messages – plain or encrypted – can be embedded in images.
This article assumes that you already know about steganography, PNG text fragments, and symmetric encryption with Igodo. I recommend reading the first part before continuing if you haven’t already.
Secret Message Application
I also discovered a flaw in the use of symmetric encryption specific to our use case. With the secret messaging app, users will be able to upload photos as their stories and hide messages from specific users. Symmetric encryption opens up opportunities for use because the secret message is encrypted and decrypted using the same key. This means there is a way to pass the same encryption key from the sender to the recipient so they can find the original message. And this ideally means an Internet connection.
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Therefore, if someone else finds this key, all encrypted data can be decrypted by monitoring network requests and load. Yes, messaging will no longer be a secret and it will no longer be a fun project.
However, this can be overcome with asymmetric encryption. In asymmetric encryption, cryptography is used to create two different but related keys, which can be used for encryption and decryption. As a rule, a public and private key pair will be generated. Messages encrypted with a public key can be shared anywhere on the Internet because it is not possible to generate a private key from it. At the receiving end, the incoming message is encrypted with a private key.
With this technique, the private key can remain on the owner’s device, while the public key is shared when someone needs to send a secret message to it. This is the same principle (albeit in its simplest form) that is used to encrypt messages in WhatsApp and even in blockchain applications.
There are many asymmetric encryption algorithms, but for this series I chose RSA. I also found the Dart package which has an implementation of this algorithm with key pair generation logic.
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I cleaned up the code base from the last part. The encode method no longer returns a list of integers representing the resulting image in bytes. Instead, it writes to a file and returns it. The source file path can be specified, but a single path to the input file in the same directory will be created if no source file path is specified or an invalid path is specified.
Additionally, the EncryptionType enumeration is introduced to allow specifying what type of encryption to perform, symmetric (in this case Igodo will be used) or asymmetric (RSA).
Now we can look at the modified encryption method. If the encryption type is asymmetric, the encryption key is decrypted as an RSA public key and used to encrypt the message. The message is then written to the text portion of the resulting PNG image, which in turn is written to the output file.
Decoding takes place in the same way. The encryption type is specified, and depending on it, the message is decrypted symmetrically using Igodo or asymmetrically using an RSA private key.
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The decrypt method now takes an additional encryption argument to specify, you guessed it, what type of decryption to perform.
In the next section, I’ll show you how to make this steganography magic happen in a real-life use case – a secret message filter app. Users will be able to share photos in their stories (WhatsApp style) and will have the option to hide secret messages from certain users.
The code for this series is currently contained in the Dart package, which you can find on GitHub so you can see more detailed implementation details. Can you hide messages on your iPhone? If you need to know how to hide text messages on your phone in Messages or a secret messaging app, we can help. You can block or hide messages and mute notifications for the Messages app to keep your personal information private. There are also a number of secret text messaging apps for iPhone.
If you need to know how to hide messages on your phone, this post will show you the options. Hiding text messages isn’t always easy, and finding hidden text messages is equally difficult, so let’s dig in and see how it’s done! Keeping your text messages private with these apps is easier than you think. This is also the best answer on how to unlock messages on iPhone. These apps can intercept your text messages with an extra layer of security.
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Remember that many scammers also prefer encrypted messaging services, so make sure you don’t send personal information to anyone you don’t know or trust when using apps This.
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This is a great option if you’re looking to hide messages on iPhone or view blocked messages. It’s end-to-end encryption so only you and the recipient can see the messages and texts you send.
Wire is great because it allows you to do more than just hide text messages on your phone. You can also send and receive files, FaceTime, call, and chat. This is a more complex secret messaging app than some of the options out there.
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Signal is a great option for iPhone, and you can also download the app to iPad by following this tip. You can use Signal for private one-on-one or group chats, and it’s all end-to-end encrypted. Voice and video calls are also provided, and you can share media and files. For more helpful iPhone security tips, check out our free Tip of the Day newsletter.
If you use any of the above apps on your iPhone to hide your iPhone messages or lock your messages, you should consider how to hide apps on your iPhone. This is a great way to hide secret messaging apps on iPhone or simply hide your iPhone home screen.
If you don’t want to use a third-party app to hide your messages on your iPhone, there are a few ways you can prevent others from seeing your messages. Learn how to hide iMessages below.
An easy way to hide text messages on iPhone is to turn off the message view that appears on the lock screen. This won’t hide or block the message in the Messages app, but it will prevent the message content from appearing on the screen. That way, you don’t have to worry about your phone being nearby. If you turn this feature off in settings, no one can see your iPhone message previews! You can also turn off notifications for the Messages app so no one notices incoming messages.
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If you have iOS 16, you can use the Unsend feature to hide iMessage until you send it within 15 minutes.
If you’re wondering how to hide iMessages on iPhone or save them without saving them on your phone, you have another option. You can save a text conversation on your computer and then delete it from your device. Another way to save a text conversation but never see it again is to take screenshots of the conversation and save them to your computer, disk, or flash drive, then delete the conversation.
These options are useful if you want to hide text messages or keep them private without using another app or service.
Another way to learn how to hide text messages on your phone without deleting them is to turn off text message forwarding. Text message forwarding is a feature that sends your messages from your phone to other Apple devices, such as an iPad or Mac. Therefore, this feature ensures that you do not miss important text messages when using a device other than your phone. However, if you share your device with your children or spouse, they can easily see text messages that you don’t want them to see. Please turn off text forwarding so no one can see your messages on another device.
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Unfortunately, there is no one-size-fits-all answer to this question, and that’s simply because there are so many ways to hide messages.
If a message is simply hidden but not deleted, it will still appear in the Messages app and be findable, even if it’s difficult to see. If messages have been hidden by a third-party application, access methods will vary depending on the application and the user’s settings. If a user deletes a message or conversation, it will unfortunately no longer be on the device, but you will be able to restore deleted text messages if they are synced to iCloud. Next, learn how to find hidden apps on your iPhone.
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