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the file is encrypted and stored in a folder.then i have store this file into a image.at the time of download we see that image.when we click the image it ask the key.if correct key is provided,then only the file is to be decrypted and downloaded.
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There nothing magic in this process: an encrypted file is a binary one, that is a bunch of bytes you may add to the image file using steganography (provided it fits into the image), see, for instance: "Steganography - Hiding messages in the Noise of a Picture"[^]. On receiving the image, the binary file can be extracted and plain text obtained using the decryption function with the proper key.
 
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Sergey Alexandrovich Kryukov 6-Oct-14 10:48am    
5ed.
—SA
CPallini 6-Oct-14 10:52am    
Thank you.

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