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A combination of encryption and the "purloined letter method" might work. Some years ago I wrote a program that would append a file to an image file. If no one looked too closely, it looked just like an image file and in fact could be displayed just as an image would. Another program stripped out the added file for the intended recipient. If that file were encrypted, it would further add to security.
However as has been mentioned, if someone knew what to look for and had a good decryption program you'd still be SOL.
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