Secret Message Exchange vs StegoSafe

Have you ever experienced that the messages between you and your family, friends (partners) on SNS somehow are seen by someone else? If you have such a concern, you can solve the problem if you can exchange messages in a way that only you and your partners can understand. By using this application, a sender can embed a message in an image (photo) and posts it on an SNS, then the receiver can restore and read the embedded message from the image. Since the sender and receiver of the message use the same "key image" to embed (encrypt) and restore (decrypt) the message into/from the key image, the sender and receiver need to register the same image as the key image in advance in this application. One sample key image is registered in this application. So, it is recommended that you try it once by using the sample key image and experience what it feels like. [Note] - Only landscape image with aspect ratio 4: 3 can be used. - The key image to be registered for each of the sender and receiver must have the same image size and file size. If you do not have the exact same key, you can not decrypt the message correctly. - In the case of the image sent by e-mail, the image size may be reduced due to limitation of the e-mail attachment file size, so please pay attention to the file size when you use email. Overview of the operation follows; == Create an encrypted message == 1. Launch this application and tap "Encryption" button. 2. Select a key image. If you use key images other than samples, In-app Purchase is required. 3. Type your message. 4. Tap "Encrypt" button. 5. The message is embedded in the key image and saved in the Photo Library, so post it using SNS applications or email. == Decrypt an encrypted message == 1. Save the image received by SNS applications or email to Photo Library. At this time, it needs to be saved with the image size and file size as it is sent. 2. Open this application and tap "Decryption" button. 3. Select an image from the Photo Library, and select the corresponding key image as well. 4. Tap "Decrypt" button to decrypt and display a message. [Note] - The displayed message is an image. If you want to save the message, please take a screenshot and save it as an image. - Depending on the key image used, noise (black dots) may be displayed on the message screen. We are happy if you are interested in this application. Thanks!

StegoSafe hides an encrypted secret inside an ordinary photo. The photo still looks like a photo — the secret rides in bits the eye can't see — so what you protect doesn't announce itself. Everything happens on your device. No account, no sign-in, no servers. Your secret and your password never leave your iPhone, iPad, or Mac. HOW IT WORKS • Type a secret — a recovery phrase, a password, a private note. • Pick a cover photo and choose how to protect it. • StegoSafe encrypts the secret and weaves it into the image. • Save the PNG, share it, or keep it. To read it back, open it in StegoSafe with your credentials. THREE WAYS TO PROTECT • Password — open it on any device, any time, as long as you know the password. • This device only — a key kept on this device behind Face ID / Touch ID. Nothing to phish out of you; nothing to recover if the device is lost. • Face ID / Touch ID + PIN — two factors. Opening needs both the device and a PIN you set. SPLIT ACROSS PHOTOS Break a secret into several share-images and set how many are needed to rebuild it — for example, any 3 of 5. No single photo reveals anything on its own. BUILT FOR PRIVACY • AES-256-GCM encryption, keys derived with PBKDF2-SHA256 (600,000 iterations). • Keep it as a PNG — re-compressing it (as chat apps do) is what destroys the hidden data, so StegoSafe helps you keep the real file. • Nothing is read from an image until you unlock it. A damaged or re-compressed image is reported as damaged — you're never handed a secret that's subtly wrong. IMPORTANT Only you can open your content. If you lose your password — or, for device-bound images, the device — it cannot be recovered, by you or by us. Write your password down somewhere safe. StegoSafe is for lawful, personal use.