شبیه‌سازی و ارزیابی تاثیر نویزهای لغزش زمانی و گم‌شدن بسته بر کارایی کانال زمان‌بندی‌دار پوششی

نویسندگان

1 دانشجوی کارشناسی ارشد، دانشگاه جامع امام حسین(ع)

2 استادیار، دانشگاه جامع امام حسین(ع)

چکیده

لغزش زمانی و گم شدن بسته مهم‌ترین نویزهای مؤثر بر کارایی کانال‌های زمانبندی‌دار پوششی است. کانال‌های زمانبندی‌دار پوششی یکی از فناوری‌هایی است که به واسطه آن می‌توان اطلاعات را به صورت مخفیانه تبادل نمود. مطالعات گسترده‌ای در خصوص ارزیابی کانال‌های پوششی صورت گرفته است، ولی تمام ارزیابی‌های صورت گرفته در این حوزه، تاکنون مبتنی‌بر اندازه‌گیری در محیط واقعی یا روش محاسباتی بوده است. در روش‌های محاسباتی و اندازه‌گیری در محیط واقعی، امکان ایجاد شرایط خاص و آزمایش و ارزیابی کانال در آن شرایط وجود ندارند. در این تحقیق کانال زمانبندی‌دار پوششی و نویزهای لغزش زمانی و گم شدن بسته، با استفاده از شبکه پتری شبیه-سازی شده و معیارهای ظرفیت و استحکام آن مورد ارزیابی قرار گرفته است. نتایج تحقیق نشان می‌دهد که شبیه‌سازی کانال و نویزهای مربوطه، بخوبی می‌تواند ویژگی‌ها، پارامترها و معیارهای مورد نیاز برای ارزیابی کانال در شرایط خاص را تأمین نماید.

کلیدواژه‌ها


عنوان مقاله [English]

Simulation and Evaluation of Jitter and Packet Loss Noises Influence on Covert Timing Channel Performance

نویسندگان [English]

  • Mojtaba Saadati 1
  • Mahdi Dehqani 2
  • Mahmoud Saleh Esfahani 2
1 Master's student, Imam Hossein University
2 Assistant Professor, Imam Hossein University
چکیده [English]

Covert timing channels are used in transmitting information in a secret way. Jitter and packet loss are
two important noises that affect Covert Timing Channel performance. Several studies on evaluating
capacities and robustness of covert channels were done, but all those were based on measurement in real
environment or computational methods. Measurement in real environment and computational methods do
not have the capacity of creating special circumstances and evaluating the channel in those circumstances.
In the present research, a covert timing channel on the Internet consisting two packet losses and jitter noises
was simulated using Petri-Net. Also, capacity and robustness criteria of channel were evaluated. The results
of the simulation showed that weibull distribution function to modeling HTTP traffic transmitter, laplacian
distribution function to modeling network jitter and bernoulli distribution function to modeling packet loss
are careful enough. Also, parameters of these models obtained to optimum capacity and robustness.

کلیدواژه‌ها [English]

  • Simulation
  • Network Noise
  • Jitter
  • Packet Loss
  • Covert Timing Channel
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