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Protocols for data hiding in pseudo-random state

机译:伪随机状态下的数据协议

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An emerging form of steganographic communication uses ciphertext to replace the output of a random or strong pseudo-random number generator. PRNG-driven media, for example computer animated backdrops in video-conferencing channels, can then be used as a covert channel, if the PRNG bits that generated a piece of content can be estimated by the recipient. However, all bits sent over such a channel must be computationally indistinguishable from i.i.d. coin flips. Ci-phertext messages and even key exchange datagrams are easily shaped to match this distribution; however, when placing these messages into a continous stream of PRNG bits, the sender is unable to provide synchronization markers, metadata, or error correction to ensure the message's location and proper decoding. In this paper we explore methods for message transmission and steganographic key exchange in such a "coin flip" channel. We establish that key exchange is generally not possible in this channel if an adversary possesses even a modest noise budget. If the warden is not vigilant in adding noise, however, communication is very simple.
机译:一种新兴的书签通信形式使用密文来替换随机或强伪随机数发生器的输出。如果可以由收件人估计,则PRNG驱动媒体,例如视频会议通道中的计算机动画背景可以用作封面信道。可以由收件人估计产生一段内容的PRNG比特。但是,发送在此类频道上的所有位必须从I.I.D计算地无法区分。硬币翻转。 CI-Phertext消息甚至密钥Exchange数据报均易于匹配此分布;然而,当将这些消息放入PRNG比特的持续流时,发件人无法提供同步标记,元数据或纠错,以确保消息的位置和正确的解码。在本文中,我们探索了这种“硬币翻转”通道中的消息传输和隐写键交换的方法。如果一个对手甚至具有适度的噪声预算,我们就可以在此渠道中确定在此渠道中通常不可能进行关键交换。然而,如果守望者在增加噪音时没有警惕,则沟通非常简单。

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