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Fast Data Protection for Mobile Agents: Avoiding Attacks in Malicious Hosts

Explore a secure mobile agent system protecting against attacks, featuring encryption using bitmaps & XOR. Learn about limitations and conclusions of this innovative technique.

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Fast Data Protection for Mobile Agents: Avoiding Attacks in Malicious Hosts

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  1. A Fast Data Protection Technique for Mobile Agents to Avoid Attacks in Malicious Hosts Jesús Arturo Pérez Díaz Darío Álvarez Gutiérrez Department of Informatics University of Oviedo Oviedo, Asturias, Spain Presenter: Chin-chi Lo

  2. Outline • A Secure Mobile Agent System • Traditional Techniques • Encryption Algorithm using Bitmaps & XOR • Limitations & Conclusion

  3. A Secure Mobile Agent System • Protection of the agent system against attacks from mobile agents. • Protection of the agent against agents. • Protection of information transmission between agent servers against unauthorized third parties. • Protection of the agent against malicious agent systems.

  4. Traditional Techniques • Public key cryptography • Digital Signatures • Implementing Secure Channel • Ex: SSL, TLS All of the above are too complex and almost unfeasible in terms of performance.

  5. Data Encryption using Bitmaps & the XOR Operation • Bitmaps A random number expressed as a bitmap in a row of a matrix carried by an agent and known only to the source server. • XOR Applying XOR operation between data and a random number.

  6. Data Area of the Mobile Agent

  7. Fields • HostID: identifier of a server. • CW: “codeword”, used to rotate the data before applying the encryption function. • CRC: verifying if the data is altered. The initial value is binary 0’s.

  8. Encryption Algorithm • The remote server creates a record with the same fields. • The host ID, data to be encrypted in 128-bit blocks form and a generated random CW are put into the record. • is rotated to the left ,where

  9. Encryption Algorithm (Cont.) • Before applying the (3.), the CW is rotated to the right.(7 most-significant bits of CW)Thus, each is not always the same.

  10. Encryption Algorithm (Cont.) • The original CW is restored into the corresponding field of the register in order to retrieve the original information using the inverse algorithm in the source server. • Computing CRC. • The corresponding original bitmap is XOR’ed with generated data. • The counter indicating the number of lines used in the matrix is incremented.

  11. Limitations of the Method • Does not prevent the possible alternation of data from malicious hosts • The current server could see and copy the still available rows . • The two cooperating malicious servers. • There is a fixed maximum number of data that can be protected.

  12. Conclusion • That is a trade-off between performance and security.

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