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Is there any way someone could recover hidden text from a jpg. For example in the picture

enter image description here

schroeder
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Leon
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  • Closely related: [JPEG artifacts leaking information about redacted contents](https://security.stackexchange.com/questions/184131/jpeg-artifacts-leaking-information-about-redacted-contents), [How secure is 'blacking out' sensitive information using MS Paint?](https://security.stackexchange.com/questions/126932/how-secure-is-blacking-out-sensitive-information-using-ms-paint) – AndrolGenhald Oct 16 '18 at 15:12
  • What makes you think that there is hidden content in the image? It is probably just a yellow bar and not a yellow bar over something hidden. – Steffen Ullrich Oct 16 '18 at 15:20
  • There could be information in others... Thats just an example – Leon Oct 16 '18 at 15:24

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The JPEG format has no concept of multiple layers. This means, there can not be any invisible information in the image data itself which somehow can be made visible. It is though possible that meta information contained in the JPEG file still contain information somebody tried to hide. For example an image editor might unknowingly preserve the thumbnail image of the original image (i.e. before the edit) and thus accidentally spill information intended to be hidden.

Steffen Ullrich
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