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can i get code for image encryption/decryption

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ajay kumar
ajay kumar 2013-11-23
评论： Walter Roberson 2017-8-12
i require code for picture encryption/decryption process.
can any one provide.........
  2 个评论
Walter Roberson
Walter Roberson 2013-11-27
AES is one of the encryption systems that we absolutely may not discuss code for, due to legal reasons.
Walter Roberson
Walter Roberson 2017-8-12
No, using a random phrase key exceeds the legal limits imposed by the USA Department of Commerce as to what encryption theory or encryption code it is legal to discuss without pre-approval of the topic limits and list of participants by that department. The encryption code I posted below is at the outer limits of what can be posted here, and I have always worried whether I in fact exceeded the limits. In some countries it would be enough to get me arrested these days.

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采纳的回答

Image Analyst
Image Analyst 2013-11-23
We don't get into detailed complicated algorithm. You can check out the literature and choose your own algorithm. See VisonBib: http://iris.usc.edu/Vision-Notes/bibliography/contentschar.html#OCR,%20Document%20Analysis%20and%20Character%20Recognition%20Systems, particularly these sections:
23.3.8 Image Hiding, Data Hiding, Steganography, Steganalysis
23.3.8.1 Data Hiding, Steganography, LSB, Least Significant Bit
23.3.8.2 Halftone Images, Compressed Images: Image Hiding, Data Hiding, Steganography
23.3.8.3 Surveys, Image Hiding, Data Hiding, Steganography
23.3.9 Watermarks for Copyright, Ownership Protection, Authentication, Verification, Forgery
23.3.9.1 Tamper Detection
23.3.9.2 Fragile Watermarks
23.3.9.3 Encryption, Visual Cryptography, Authentication
23.3.10 Watermarks: Extraction, Detection or Recovery
23.3.11 Watermarks in Video and Multi-Media, Other Data
23.3.11.1 Video Data Hiding, Data Hiding in Video, Video Steganography
You will find citations to papers there that you can review to find an algorithm that you want to try. Good luck. Come back here if you have MATLAB questions (instead of algorithm questions, unless they're really simple like how to improve program flow).

更多回答（2 个）

Walter Roberson
Walter Roberson 2013-11-23
The input for cryptographic algorithms is generally not plain text. If you do happen to have such an algorithm on hand, you could use base64 encoding or uuencoding (the two are very similar) to represent the input as plain text.
(Note: we will not be able to discuss details of non-trivial cryptographic routines here for legal reasons. We can, though, mention use of cryptographic routines if we do not discuss implementation or the theory of how they work.)
Walter Roberson
Walter Roberson 2013-11-27
Encryption code, for a vector of uint8:
outvector = invector + 1;
outvector(invector == 255) = 0;
Decryption code, for a vector of uint8:
outvector = invector - 1;
outvector(invector == 0) = 255;

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