Everybody has a right to privacy. Your secret information can be saved as a file (photo, document, program, music or video file etc.). You do not want anyone to know your secret and anyone to suspect you have a secret. Insider permit the customer user to conceal details (of their private life or business) from unauthorized viewers. If the customer user needs to conceal secret files, he can use various programs for protection. Meanwhile these programs do not allow use of the concealed data as easily and safely as you can with normally unprotected files. Our application is not available obviously. It is hidden inside another, absolutely inconspicious application (file compression utility). secret files are compressed and kept inside containers - usually pictures. These pictures themselves are not distorted. Any application that can be used to view the pictures will show the containers content only. The above mentioned characteristics are very important psychologically. When there is no indication of an encrypted file, encryption application or special encryption tools are not evident, the computers owner is above of suspicion. As a result nobody will try to reveal their secret information. Insider creates compressed archives and works with these files while the archives themselves are not evident on the user?s computer. To encrypt a compressed archive before hiding it, the latest strong cryptography methods known are used. The size of a hidden file is not limited. If you know the right password, the hidden archive can be viewed and processed very easily. If this application had deleted the file they could not be restored. Any special software or hardware is powerless to restore them. This application may be used for information exchange via Internet. Hidden archives may be sent via e-mail or published on web sites. You may also send the photos (with hidden files) via mobile operators.The containers may be kept within mobile phones or digital cameras where they will look like usual photos.