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Sikkerhed

Sikkerhed. Trusler og antagelser Krypteringsalgoritmer Ciphers Eksempler Autentifikation med delt nøgle Digital signatur Mobil kode. Disposition. Eavesdropping (aflytning) Masquerading (identitetsforfalskning) Message tampering (ændring af indhold) Replaying (gentagelse)

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Sikkerhed

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  1. Sikkerhed

  2. Trusler og antagelser • Krypteringsalgoritmer • Ciphers • Eksempler • Autentifikation med delt nøgle • Digital signatur • Mobil kode Disposition

  3. Eavesdropping (aflytning) • Masquerading (identitetsforfalskning) • Message tampering (ændring af indhold) • Replaying (gentagelse) • Denial of service (overbelastning) • “Fjenden” har mange resourcerogadgangtil alt bortsetfranøgler • Cost-benefit/Intetersikkert Truslerog worst-case antagelser

  4. Symmetrisk • Kryptering og dekryptering med samme nøgle • Asymmetrisk • Public key • Private key • D(Kpriv,M)=E(Kpub,M) -1 Krypteringsalgoritmer

  5. Block Cipher-Chains Stream Ciphers Ciphers

  6. Authentication

  7. Digital Signatur

  8. Needham-Shroeder

  9. Intet er sikkert • Nøgler kan være både symmetriske og asymmetriske • Kryptering I sig selv kan godt vise mønstre som giver information til lyttere Opsumering

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