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Plaintext reconstruction of encrypted SSH traffic

Authors: Johansen, Filip;

Plaintext reconstruction of encrypted SSH traffic

Abstract

I denne masteroppgaven ble et tidsbasert angrep utført på SSH-protokollen, der forfatterens skriverytme ble brukt for å omgå de kryptografiske skjemaene brukt i SSH. Målet med masteroppgaven er å rekonstruere klarteksten bak de krypterte SSH-pakkene ved å bruke pakke-til-pakke tiden hentet ut fra SSH-trafikken. Forskningen bestod av datainnsamling og dataanalyse. I datainnsamlingen ble et datasett laget ved å bruke 578313 tastetrykk og simulere disse gjennom en SSH-kobling. Deretter ble pakke-til-pakke tiden for denne trafikken hentet. I dataanalysen ble først gjennomsnitt og standardverdi regnet ut for alle bokstavpar og bokstavtripletter. For hver innkommende latency-verdi blir det deretter regnet ut en score basert på bokstavpar og bokstavtriplett som blir brukt som en indikator for å forutsi hvilket bokstavpar eller bokstavtriplett denne innkommende latency-verdien tilhører. For å forbedre resultatene ble det i tillegg brukt informasjon om bokstavpar- og bokstavtriplettfordeling i det engelske språket. Dette ble hentet ved å web-scrape 7 bøker fra Gutenberg project. Forskningen resulterte i at det var mulig å rekonstruere ord der innkommende latency-verdier er nærme gjennomsnittet til bokstavpar eller bokstavtripletter. Etter som verdiene avviker mer og mer fra gjennomsnittet, blir det svært vanskelig å rekonstruere riktig klartekst da datasettet består av mye overlappende verdier mellom bokstavparene og bokstavtriplettene.

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
Green