ENCRYPTED FILE WITH HIDDEN CONTENTS

• US 20100111293A1
• Filed: 01/17/2008
• Published: 05/06/2010
• Est. Priority Date: 01/18/2007
• Status: Abandoned Application

• Current Assignee: Gita Technologies Ltd. (Cognyte Software Ltd.)
• Original Assignee: Gita Technologies Ltd. (Cognyte Software Ltd.)
• Inventors: Frenkel, Lior, Zilberstein, Amir
• Application Number:
  US12/522,543
• Publication Number:
  US 20100111293A1
• Time in Patent Office: Days
• US Class Current: 380/28
• CPC Class Codes: G09C 5/00 Ciphering apparatus or methods not provided for in the preceding groups, e.g. involving the concealment or deformation of graphic data such as designs, written or printed messages

Abstract

A method for storing data includes encrypting a first file (30) so as to generate a block (32) of encrypted data. The block of the encrypted data is inserted into a second file (34) containing data having a random distribution. The second file, including the block of the encrypted data, is stored in a storage medium (24).

Claims

1. A method for storing data, comprising:

encrypting a first file so as to generate a block of encrypted data;

inserting the block of the encrypted data into a second file containing data having a random distribution; and

storing the second file, including the block of the encrypted data, in a storage medium.

2. The method according to claim 1, wherein encrypting the first file comprises randomizing the encrypted data in the block.

3. The method according to claim 1, wherein inserting the block comprises selecting, using a process of variable selection, a location in the second file at which to insert the block of the encrypted data.

4. The method according to claim 3, wherein selecting the location comprises applying a pseudo-random process in selecting the location.

5. The method according to claim 3, wherein encrypting the first file comprises providing a first key for use in decrypting the first file, and wherein inserting the block comprises providing a second key identifying the location of the block of the encrypted data in the second file.

6. The method according to claim 5, and comprising retrieving the second file from the storage medium, and decrypting the first file using the first and second keys.

7. The method according to claim 1, wherein encrypting the first file comprises generating a first block of first encrypted data, and wherein inserting the block of the encrypted data comprises inserting the first block at a first location in the second file, and wherein the method comprises encrypting a third file so as to generate a second block of second encrypted data, and inserting the second block at a second location in the second file.

8. The method according to claim 7, wherein the first and second blocks are generated and inserted using different first and second keys.

9. The method according to claim 1, wherein the second file is stored using a file system of a host computer, which is coupled to the storage medium, and wherein the file system provides no indication that the second file contains the second file.

10. Apparatus for storing data, comprising:

a storage medium; and

an encryption processor, which is configured to encrypt a first file so as to generate a block of encrypted data, and to insert the block of the encrypted data into a second file containing data having a random distribution, and to store the second file, including the block of the encrypted data, in the storage medium.

12. The apparatus according to claim 10, wherein the processor is configured to select, using a process of variable selection, a location in the second file at which to insert the block of the encrypted data.

11. (canceled)

13-18. -18. (canceled)

19. A computer software product, comprising a computer-readable medium in which program instructions are stored, which instructions, when read by a computer, cause the computer to encrypt a first file so as to generate a block of encrypted data, and to insert the block of the encrypted data into a second file containing data having a random distribution, and to store the second file, including the block of the encrypted data, in a storage medium.

20. The product according to claim 19, wherein the encrypted data in the block are randomized.

21. The product according to claim 19, wherein the instructions cause the computer to select, using a process of variable selection, a location in the second file at which to insert the block of the encrypted data.

22. The product according to claim 21, wherein the instructions cause the computer to apply a pseudo-random process in selecting the location.

23. The product according to claim 21, wherein a first key is provided for use in decrypting the first file, and wherein the instructions cause the computer to provide a second key identifying the location of the block of the encrypted data in the second file.

24. The product according to claim 23, wherein the instructions cause the computer to retrieve the second file from the storage medium, and to decrypt the first file using the first and second keys.

25. The product according to claim 19, wherein encrypting the first file generates a first block of first encrypted data, which is inserted at a first location in the second file, and

wherein the instructions cause the computer to encrypt a third file so as to generate a second block of second encrypted data, and to insert the second block at a second location in the first file.

26. The product according to claim 25, wherein the first and second blocks are generated and inserted using different first and second keys.

27. The product according to claim 19, the second file using a file system, and wherein the file system provides no indication that the first file contains the second file.