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Network Steganography Methods

Network Steganography Methods. By Naga Dinesh Reddy Chavva. What is Steganography ?. The word steganography is of Greek origin and means "concealed writing."

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Network Steganography Methods

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  1. Network Steganography Methods By Naga Dinesh Reddy Chavva

  2. What is Steganography ? • The word steganography is of Greek origin and means "concealed writing." • It combines the Greek words steganos(στεγανός), meaning "covered or protected," and graphei (γραφή) meaning "writing.“ • Steganography is the art and science of encoding hidden messages in such a way that no one, apart from the sender and intended recipient, suspects the existence of the message.

  3. Network Steganography • Typical steganographicmethods utilize digital media (images, audio and video files) as a cover for hidden data. • Network steganography utilizes communication protocols' control elements and their basic intrinsic functionality. • Typical network steganography method uses modification of a single network protocol.

  4. The protocol modification may be applied to the PDU (Protocol Data Unit), time relations between exchanged PDUs, or both (hybrid methods). • Network Steganography is classified into two types of protocol modification. • intra-protocol • inter-protocol

  5. Classification

  6. Intra-protocol method HICCUPS Hidden Communication System for Corrupted Networks • It modifies frames protocol specific fields and their content. It is especially suitable for WLANs (Wireless Local Area Networks) • Usage of frames with intentionally wrong checksums to establish covert communication

  7. HICCUPS Operation • It is a steganographic system for hidden group with common knowledge. • Host sends a corrupted frame (with incorrect checksum) • Remaining hidden hosts change their mode of operation to corrupted frame mode. • HICCUPS replaces payload of intentionally corrupted frames at the transmitter

  8. HICCUPS Operation

  9. HICCUPS Operation

  10. Questions ?

  11. THANK YOU

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