Package de.das.encrypter.tools

Class ByteArrayEncloser

java.lang.Object
de.das.encrypter.tools.ByteArrayEncloser
Direct Known Subclasses:
ByteArrayImgEncloser, ByteArrayWavEncloser
public class ByteArrayEncloser extends Object
Byte array enclosers interweave the bits of the individual bytes of a byte array with the bytes of suitable containers. Suitable containers are files where the least significant bits of their bytes can be set arbitrarily without causing detectable damage to the representation of the file contents.

Examples of such containers are, for example, images where the RGB values are stored uncompressed or whose RGB values are not changed by the compression. Audio files in WAV format can also be used. Both when viewing the images and playing the audio files, the interwoven data cannot be detected.

Before data is interwoven with the bytes of a container, they are preceded by an identifier and four bytes (little endian) with the number of bytes interwoven. Thus it can be determined already at few first bytes of a container whether the container contains woven in data and how many there are.

When files are woven in, the identifier and length information are followed by another identifier, two bytes representing the length of the following filename (little endian), and the bytes of the filename itself.

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    static final byte[]
    HIDDEN_FILE_ID
    An additional identifier for the information preceding the data to be woven in, indicating that the data woven in is a file.
    static final byte[]
    ID
    An identifier that is prepended to the actual data, so that it is possible to recognize already during the recovery of a few bytes whether there is woven data in a possible container or not.

  • Constructor Summary

    Constructors
    Constructor
    Description
    ByteArrayEncloser()
     

  • Method Summary

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Field Details

    • ID

      public static final byte[] ID
      An identifier that is prepended to the actual data, so that it is possible to recognize already during the recovery of a few bytes whether there is woven data in a possible container or not.

    • HIDDEN_FILE_ID

      public static final byte[] HIDDEN_FILE_ID
      An additional identifier for the information preceding the data to be woven in, indicating that the data woven in is a file.

  • Constructor Details

    • ByteArrayEncloser

      public ByteArrayEncloser()