Download Information Hiding: First International Workshop, Cambridge, by Ross Anderson PDF
By Ross Anderson
This e-book constitutes the strictly refereed post-workshop complaints of the 1st overseas Workshop on info Hiding, held in Cambridge, united kingdom, in May/June 1996, in the examine programme in computing device safeguard, cryptology and coding conception geared up via the amount editor on the Isaac Newton Institute in Cambridge. paintings on info hiding has been performed during the last few years inside diversified learn groups, normally ignorant of each one other's lifestyles. The 26 papers awarded outline the state-of-the-art and lay the root for a standard terminology. This workshop is particularly prone to be visible sooner or later as a kind of landmark occasions that mark the beginning of a brand new clinical self-discipline.
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Additional resources for Information Hiding: First International Workshop, Cambridge, U.K., May 30 - June 1, 1996. Proceedings
Example text
A is an allowable hardening action. We use A to denote the set of all possible hardening actions. stop_ftp(2) block_host(0) stop_sshd(1) ftp(0,1) ftp_rhosts(0,1) ftp(1,2) trust(1,0) sshd(0,1) ftp(0,2) ftp_rhosts(1,2) rsh(0,1) sshd_bof(0,1) ftp_rhosts(0,2) trust(2,1) user(1) trust(2,0) rsh(1,2) rsh(0,2) user(2) local_bof(2) root(2) Fig. 3 Possible hardening actions (orange rectangles) for the attack graph of Fig. 3 depicts the same attack graph of Fig. 2, but it explicitly shows the allowable hardening actions, represented as rounded rectangles.
2 Therefore, when choosing a set of initial conditions to be removed in order to prevent attacks on given targets, we should take into account all the implications of removing those conditions. Removing specific initial conditions may require to take actions that disable additional conditions, including conditions not explicitly modeled in the attack graph, such as conditions that are not part of any attack path. To address this problem, we formalize the notion of hardening strategy in terms of allowable actions, and define a cost model that takes into account the impact of hardening actions.
6 shows an example of attack graph with two initial conditions. c1 _ c2 / ^ c1 ^ c2 /, and the DNF is L Á :c1 ^ :c2 _ :c1 _ :c2 . Clearly, among the three options :c1 ^ :c2 , :c1 , and :c2 , the first incurs no less cost than the second or the third and hence should be removed from consideration. The above example also shows that theoretically the DNF of L may have an exponential size in the number of initial conditions (after the above reduction, this number of options will be bound by the number of incomparable subsets of n n by Sperner’s initial conditions, which is known as the binomial coefficient bn=2c Theorem).