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Protocols for data hiding in pseudo-random state

机译:在伪随机状态下隐藏数据的协议

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摘要

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 videoconferencing 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.rnHowever, all bits sent over such a channel must be computationally indistinguishable from i.i.d. coin flips. Ciphertext 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.rnIn 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:隐秘通信的一种新兴形式是使用密文代替随机或强伪随机数生成器的输出。如果接收方可以估算出产生内容的PRNG位,则PRNG驱动的媒体(例如,视频会议频道中的计算机动画背景)可以用作隐蔽频道。但是,通过该频道发送的所有位必须与iid在计算上没有区别硬币翻转。密文消息甚至密钥交换数据报都可以很容易地调整形状以匹配这种分布。但是,当将这些消息放入连续的PRNG位流中时,发送方无法提供同步标记,元数据或纠错以确保消息的位置和正确的解码。rn本文探讨了消息传输和隐秘密钥交换的方法。在这样的“投币”渠道中。我们确定,如果对手什至拥有适度的噪声预算,则通常无法在此通道中进行密钥交换。但是,如果看守不注意增加噪音,则通信非常简单。

著录项

  • 来源
    《Media forensics and security》|2009年|72540W.1-72540W.10|共10页
  • 会议地点 San Jose CA(US)
  • 作者

    Scott Craver; Enping Li; Jun Yu;

  • 作者单位

    Binghamton University, Binghamton NY, USA;

    Binghamton University, Binghamton NY, USA;

    Binghamton University, Binghamton NY, USA;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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