New Optical Security Doesn't Require Embedment

An anonymous reader writes "Scientists are claiming to have a new type of optical security that doesn't require embedment. Optical security includes many different options but up until now they have all required that the secret image be embedded in a host image which left it vulnerable. From the article: 'To address this problem of finding the secret image in the watermark, scientists have developed a new optical security method that doesn't require embedment. Instead, the technique uses a phase retrieval algorithm to generate specific optical and phase keys that extract the secret information when applied. The optical keys contain information and are distributed to an individual through a personal identification number (PIN). The information contained in the phase keys (the main source for determining extraction) is distributed to the individual separately.'"

Comments

Huh?

[Bjarke Roune]

I think I speak for most of us who has only read the summary when I say: huh?

Is there anything new here?

[netpixie]

Storing information by modulating the Fourier (or Fresnel) modes of an image is not new.

That being said, the actual underlying science of this post might be intersting, if only I could get to it through the torrent of drivel in the summary.

e.g. "meaning that the secret image cannot be found in the watermarked image"

Then how do you extract it then?

Do you mean "the image cannot be extracted without the key"?

"Since the watermarked image contains no secret information" Que?