Dismantling OpenPuff PDF steganography

Abstract

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CovertSYS: A systematic covert communication approach for providing secure end-to-end conversation via social networks

“…While a CM H is shared on network channels, it is vulnerable to passive/active attacks that may perform the above intelligent steganalysis models to identify measurable features between standard text message and stegotext in terms of imperceptibility [33]. Note that, the primary goal of text steganography is to decrease the statistical distribution difference among these two text strings.…”

“…Note that the steganalysis only allows the detection of abnormal changes through the CM H . However, in a case that the SK is neither generated nor saved/shared by the corresponding algorithm, then adversaries cannot extract/decode the original SM from the H data even if (s)he has complete knowledge about the details of the steganography approach [33]. Also, if an attacker discovers any abnormal H data through the transferred conversations between Alice and Bob, then (s)he may still take some practical actions, such as blocking the network channel or reporting their activities to the authorities.…”

A High Capacity PDF Text Steganography Technique Based on Hashing Using Quadratic Probing

“…The incremental update method is appropriate for smaller embedding capacity. An approach in [12] described that OpenPuff scheme implants secret contents within the end-of-line symbols which are referred to as white-space-characters. In this [12], an analytical study was presented that a steganography using popular OpenPuff tool can also be detected which implies that a high embedding capacity scheme is not only the parameter for better performance of steganography technique.…”

“…An approach in [12] described that OpenPuff scheme implants secret contents within the end-of-line symbols which are referred to as white-space-characters. In this [12], an analytical study was presented that a steganography using popular OpenPuff tool can also be detected which implies that a high embedding capacity scheme is not only the parameter for better performance of steganography technique. Threshold secret sharing scheme is presented in [13] that utilize the cryptographic hash procedure to validate the shared information by an authorized shareholder through implementing the secret sharing method of [14].…”