Everybody has a right to privacy. Your confidential 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 allows the user to conceal details (of their private life or business) from unauthorized viewers. If the user needs to conceal confidential 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 program is not available obviously. It is hidden inside another, absolutely inconspicious program (file compression utility). Confidential files are compressed and kept inside containers - usually pictures. These pictures themselves are not distorted. Any program that can be used to view the pictures will show the container\'s content only. The above mentioned features are very important psychologically. When there is no indication of an encrypted file, encryptionprogram or special encryption tools are not evident, the computer\'s owner is above of suspicion. As a result nobody will try to reveal their confidential 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 program had deleted the file they could not be restored. Any special software or hardware is powerless to restore them. This program 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.