dc.contributor.author |
Gupta, Neha |
|
dc.contributor.author |
Chang, Donghoon (Advisor) |
|
dc.contributor.author |
Sanadhya, Somitra Kumar (Advisor) |
|
dc.contributor.author |
Mukhopadhyay, Sourav (Advisor) |
|
dc.date.accessioned |
2015-12-02T12:33:31Z |
|
dc.date.available |
2015-12-02T12:33:31Z |
|
dc.date.issued |
2015-12-02T12:33:31Z |
|
dc.identifier.uri |
https://repository.iiitd.edu.in/jspui/handle/123456789/343 |
|
dc.description.abstract |
In this work, we present the rst side channel collision based key recovery attack on TWINE
block cipher with 80-bit secret key and also present the improved version of the work done by
Jongsung et al. in on DES.We focus on TWINE-80 security when the rst 7, 8 and 9-rounds
of the cipher are masked. Our 7-masked round attack requires the lowest measurements (222:58)
and can recover 12-bits of the secret key. In our 8-masked round attack, we can nd 24-bits of
the secret key with 232:58 measurements whereas in our 9-masked round attack, we are able to
nd 40-bits of the secret key information with 246:17 measurements. The fact that encryption
and decryption functions of TWINE-80 are similar can be utilized to launch the above attacks
when the last 7, 8 and 9 rounds of the cipher are masked. Thus, we show that at least 20 rounds
of TWINE-80 need to be masked to ensure security against side channel leakage. The differential
characteristics constructed to demonstrate our attacks are new and hitherto not been reported
before for TWINE-80.
In our work on DES, we improved the 7-round masked attack in using one more characteristic mentioned in and we recover full round 48-bit subkey of the rst round. The data
complexity of our attack is 236:99. The time complexity is 236:99 measurements and 235:99 curve
comparisons. |
en_US |
dc.language.iso |
en |
en_US |
dc.subject |
TWINE |
en_US |
dc.subject |
DES |
en_US |
dc.subject |
Hamming weight |
en_US |
dc.subject |
Collision attack |
en_US |
dc.subject |
Masking |
en_US |
dc.subject |
Differential characteristic |
en_US |
dc.subject |
Side channel cryptanalysis |
en_US |
dc.title |
Side channel collision attack on TWINE-80 and DES with reduced masked rounds |
en_US |
dc.type |
Thesis |
en_US |