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Diskkrypteringsprestanda i GNU/Linux
Linnaeus University, Faculty of Technology, Department of Computer Science.
Linnaeus University, Faculty of Technology, Department of Computer Science.
2013 (Swedish)Independent thesis Basic level (university diploma), 5 credits / 7,5 HE creditsStudent thesis
Abstract [en]

This thesis compares the impact on disk performance in a GNU/Linux  environmentwith three encryption algorithms: AES,  Serpent and Twofish in three different implementations: DM-crypt, Loop-AES and Truecrypt. For all three algorithms a key length of 256 bits is used.

The thesis shows that the least performance impact during data encryption, and thus file writing, is reached by using AES or Twofish encryption implemented in DM-crypt or TrueCrypt. The thesis shows that some data operations with a sufficiently low processor utilization barely affects disk performance at all if encrypted using the optimal implementation and algorithm.

It is also discovered that the performance impact during data decryption, or file reading, can be minimized by using the most efficient implementation and algorithm. The best results are met with the AES or Twofish cipher, regardless of implementation.

An important conclusion that  is  drawn is that it is hard to determine a superior encryption solution for all purposes. However, by reviewing and examining the collected data from all aspects of disk performance the AES implementation in TrueCrypt is, with small marginals, determined to be the most optimal.

Abstract [sv]

Undersökningen jämför hur krypteringsalgoritmerna AES, Serpent och Twofish implementerade i DM-crypt, Loop-AES och TrueCrypt påverkar diskprestandan i en GNU/Linux-miljö. Samtliga krypteringsalgoritmer tillämpas med en nyckellängd på 256 bitar.

Undersökningen visar att högst skrivhastighet och således krypteringshastighet uppnås med algoritmerna AES och Twofish i DM-crypt eller Truecrypt. Krypteringens påverkan på diskprestanda är beroende av vilka typer av operationer som utförs och hur hög processorsysselsättningsgraden är. Vid  simplare  I/O-operationer har  den mest optimala  krypteringslösningen knappt någon påverkan på diskprestandan överhuvudtaget.

Undersökningen visar också att påverkan av prestanda vid dekryptering är minst vid tillämpning av AES eller Twofish oavsett implementering.

En viktig slutsats som dras är att det inte finns en överlägsen krypteringslösning för samtliga användningsområden. Genom att sammanställa och granska insamlad data gällande samtliga aspekter beträffande diskprestanda fastställs TrueCrypts implementation av AES till att vara den mest optimala, trots små marginaler.

Place, publisher, year, edition, pages
2013. , 35 p.
Keyword [en]
Encryption, AES, Rijndael, Serpent, Twofish, DM-crypt, Loop-AES, Truecrypt, hard drive, performance, benchmark
Keyword [sv]
Kryptering, AES, Rijndael, Serpent, Twofish, DM-crypt, Loop-AES, Truecrypt, hårddisk, prestandamätning
National Category
Other Engineering and Technologies
URN: urn:nbn:se:lnu:diva-26411OAI: diva2:627709
Subject / course
Computer Science
Educational program
IT Technician, 120 credits
Available from: 2013-06-13 Created: 2013-06-12 Last updated: 2013-06-13Bibliographically approved

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Diskkrypteringsprestanda i GNU/Linux(873 kB)426 downloads
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Ahlstedt, SebastianGranath Karlsson, David
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