Harshal Tupsamudre

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In 2013, the US National Security Agency proposed two new families of lightweight block ciphers: SIMON and SPECK. Currently, linear and differential cryptanalytic results for SIMON are available in the literature but no fault attacks have been reported so far on these two cipher families. In this paper, we show that these families of ciphers are vulnerable(More)
The graphical pattern unlock scheme which requires users to connect a minimum of 4 nodes on 3X3 grid is one of the most popular authentication mechanism on mobile devices. However prior research suggests that users' pattern choices are highly biased and hence vulnerable to guessing attacks. Moreover, 3X3 pattern choices are devoid of features such as longer(More)
Markov-based strength meters provide more accurate estimate of password strength as opposed to rule-based strength meters. However, we observed that these meters assign very high scores to slightly altered weak passwords. It is important to score modified variants of weak passwords more conservatively as the existing password cracking tools generate such(More)
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