Unified Formal Model for Synchronous and Self ... - Science Direct

Available online at www.sciencedirect.com

ScienceDirect Procedia Engineering 181 (2017) 620 – 625

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© 2017 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license ‹7KH$XWKRUV3XEOLVKHGE\(OVHYLHU/WG (http://creativecommons.org/licenses/by-nc-nd/4.0/). 3HHUUHYLHZXQGHUUHVSRQVLELOLW\RIWKHRUJDQL]LQJFRPPLWWHHRI,17(5(1* Peer-review under responsibility of the organizing committee of INTER-ENG 2016 Keywords:V\QFKURQRXVVWUHDPFLSKHUVHOIV\QFKURQL]LQJVWUHDPFLSKHUNH\VFKHGXOLQJDOJRULWKPNH\VWUHPJHQHUDWRULQQHUVWDWHIRUPDO PRGHO

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1877-7058 © 2017 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license

(http://creativecommons.org/licenses/by-nc-nd/4.0/). Peer-review under responsibility of the organizing committee of INTER-ENG 2016

doi:10.1016/j.proeng.2017.02.442

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Bogdan Crainicu / Procedia Engineering 181 (2017) 620 – 625

FS o Ssi+1 Fksi si  Si si+1  Si+1Si  SSi+1  S LLL foutput function, that produces the final encryption keykeystream based on the secret inner stateS f ^` a1 o ^` a 2 a2 d a1 d Ntzi fsi zi  ^` a 2 Function f may depend on the initial secret keyk zi fksi zi  ^` a 2 k  ^`l LY Cboolean predicateCS o ^`such that an inner state S is a valid starting state iff CS    7KH DXWKRUV UHFUHDWH WKH FRQGLWLRQ E  IURP WKH LQWHJUDWLRQ RI WKH NH\VWUHP JHQHUDWRU GbaseS F f  LQWR WKH VWUXFWXUHRIVWUHDPFLSKHUDOJRULWKPV>@ E¶ an initialization functionF0^`l u ^O` l sup o Sthat provides a starting state S0 from the key k and and lsup bit of additional information, such thatCS0    )XUWKHUDGHILQLWLRQIRUWKHLQQHUVWDWHVL]HRIWKHJHQHUDWRUGLVSURYLGHG  'HILQLWLRQ  >@ Let G be a keystream generator, and let A be a minimal autonomous finite state machine ^

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