Crypto visionen ist it sicherheit berhaupt zukunftsicher
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Crypto-Visionen – ist IT-Sicherheit überhaupt zukunftsicher?. Burt Kaliski, RSA Laboratories NetworkWorld Security-Tage München, 04. Dezember 2002. Overview. Thinking about cryptography over the next several decades Is IT-Security safe for the future?. Key Size and Space Travel.

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Crypto visionen ist it sicherheit berhaupt zukunftsicher l.jpg

Crypto-Visionen –ist IT-Sicherheit überhaupt zukunftsicher?

Burt Kaliski, RSA Laboratories

NetworkWorld Security-Tage

München, 04. Dezember 2002


Overview l.jpg
Overview

  • Thinking about cryptography over the next several decades

  • Is IT-Security safe for the future?


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Key Size and Space Travel

  • Today, 80-bit minimum (= 1024-bit RSA, 160-bit ECC)

  • NIST proposes 128-bit minimum (3072-bit RSA, 256-bit ECC) for protecting data beyond the year 2035

  • But research could change future comparisons dramatically

    • Like travel to nearby stars

BSI Empfehlung: “Geeignete Krythoalgorithmen” *Anf. § 17 Absatz 1 SigG v. 22.Mai 2001

1024-bit bis zum Jahr 2006

2048-bit ab dem Jahr 2006


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The Quantum Effect

  • Theoretically, a quantum computer can break most if not all PKC, halve symmetric key sizes

    • Shor’s, Grover’s algorithms

  • Practically, decades away (?), and incrementally visible

  • Economic model is uncertain

  • Yet quantum mechanics surely has other surprises


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A World without PKC?

  • Mental exercise: What if PKC hadn’t been invented?

  • What if PKC as we know it were broken?

  • Symmetric cryptography, hash functions still available

    • Merkle hash-tree signatures a good backup

  • Quantum cryptography ready for point-to-point


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It’s All about Trust

  • Alice and Bob traditionally have keys

  • But so far, people don’t do crypto

  • In practice, computers have our keys

  • We trust computers to use our keys properly

    • With enough assurance, symmetric cryptography is sufficient


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Proxies Near and Far

  • Devices are just proxies for user crypto operations

    • User authenticates, instructs

    • Device verifies, follows

    • System trusts based on assurance

  • PC, PDA, mobile phones, smart card are local proxies, network services are remote

    • What’s the difference?


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Device Security

  • Physical threats make it harder to trust devices

  • Secure implementation a major area of crypto research

  • New paradigms gaining importance: forward security, distributed cryptography


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Beyond the Basics

  • Traditional cryptography has focused on keeping data safe

  • Emerging cryptography will focus on keeping processes safe

  • Examples:

    • Data mining without seeing the data

    • Auctions without a broker


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Safe Utility

  • Security must be easy to use

  • Passwords, biometrics, “remote controls” will be essential tools for the user

  • Focus on safety in general, as in other consumer products. Not just security

    • Sicher = safe, secure, certain


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The Weakest Link

  • Not key size, quantum, …

  • People!

  • IT is an amazing tool for expressing human creativity, and malice

  • Which will we encourage?


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Conclusions

  • Is IT-Security safe for the future?

  • As sure as anything else people will do

  • Cryptography has much more to offer IT

  • How will you use it?


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Contact Information


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