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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
One-Pass Authenticated Encryption
 Homer, Miloslav ; Rudolf, Bohuslav (advisor) ; Hajný, Jan (referee)
The topic of this thesis are mask based one-pass authenticated encryption schemes with associated data. Formal security requirements (AUTH and PRIV), scheme requirements as well as mask system requirements are specified. The- orems regarding fulfillment of security requirements are proven given specified scheme assumptions. The proof utilizes the game-hopping technique. The the- sis contains enumeration of masking systems as well as a selection of schemes with verification that requirements are fulfilled. Last but not least, this thesis presents an attack on the OPP scheme. Recommendation on fixing this scheme is also provided. 1
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An attack upon Wieschebrink's version of Niederreiter system
 Homer, Miloslav ; Drápal, Aleš (advisor) ; Žemlička, Jan (referee)
In this work an attack upon Wieschebrink's version of Niederreiter cryptosystem using GRS codes by Couvreur et. al. from 2014 is described. Relevant notions of error-correcting code theory are presented, definitions of McEliece scheme, Niederreiter scheme and their respective Wieschebrink's modifications are shown. A description of the attack using distinguisher as described by Couvreur et. al. Based on componentwise code products and shortened codes properties follows, as does Sidelnikov-Shestakov attack on Niederreiter scheme with relevant group theory notions. Implementation details are also outlined. The attack is then summarized and its complexity is mentioned. The attack duration measured by the C++ implementation is presented in the last chapter. The program implementing the cryptosystem as well as the attack is located in the appendix with the program documentation. Powered by TCPDF (www.tcpdf.org)
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