Discuss to what extent a programmer can expect a program that conforms to a standard to generate identical results when run under different conforming compilers on different machines. Five flag bits (qci,oqi,qnp,iqo,iq) in each NTFS access-control entry (ACE) manage how it is inherited. It is the using. Estimate how many bits the algorithm would use to encode a string consisting of 1000 repetitions of the character "A". [8 marks] Some TV secures have balance, and in light of the fact that a few youngsters are TV secures, there are a few youngsters with balance.

b)

No innovator is without creative mind. However, certain individuals are without creative mind, so they should not be designers.

c)

All kid's shows show brutality, so they ought to be controlled by the public authority.

5.

Put every one of the accompanying contentions in standard structure and decide its legitimacy. You might utilize imagery yet make certain to give a key that recognizes an unmistakable suggestion (A: Alternatives to petroleum products remain monetarily impractical).

a)

Assuming options in contrast to non-renewable energy sources remain financially impractical, petroleum derivatives will keep on being popular. In any case, options are turning out to be increasingly more beneficial consistently, so the petroleum product industry will before long be in decline.

b)

"Possibly you settle your assessments, or you will be placed in prison." "I cover my charges, so then, at that point, I can't be placed in prison."

? ' e;l := 3 [3 marks] (ii) e;(iiff on the off chance that e1 tthheenn, e2 eellssee else e3) ? ' iiff on the off chance that e1 tthheenn, e;e2 eellssee else e;e3 [3 marks] (iii) e;(iiff on the off chance that e1 tthheenn, e2 eellssee else e3) ? ' iiff on the off chance that e;e1 tthheenn, e2 eellssee else e3 [3 marks] (iv) wwhhiillee while !l 0 ddoo do (e2;e3) ? ' iiff on the off chance that !l 0 tthheenn e2;(wwhhiillee while !l 0 ddoo do (e3;e2));e3 eellssee else sskkiipp skip [4 marks] X+1 k=1 ckei2kx where ck is a complicated number and ck = c k. (a) Prove that the complex coecient, ck, encodes the abundancy and stage coecients, Ak and k, in the elective structure: f(x) = X+1 k=0 Ak cos(2kx k) [10 marks] (b) What is extraordinary about the case k = 0? [2 marks] Discuss this problem from the viewpoints of both data protection law and ethics. [12 marks] 8 CST.2014.4.9 8 Security I (a) Windows implements static inheritance for the access-control lists of NTFS files and folders. (i) What does static inheritance mean here and how does it differ from dynamic inheritance? [4 marks] (ii) Five flag bits (ci,oi,np,io,i) in each NTFS access-control entry (ACE) manage how it is inherited. Briefly describe the purpose of each bit. [5 marks] (iii) User mike gives his folder project the following access-control list: project AllowAccess mike: full-access (oi,ci) AllowAccess alice: read-execute (ci,np) AllowAccess bob: read-only (oi) It contains one folder and two text files, none of which have any noninherited access-control entries: project\doc.txt project\src project\src\main.c For each of these three objects, list all inherited access-control entries, showing in parentheses the inheritance-control flag bits that are set (using the same notation as above). [5 marks] (b) Describe the purpose and four typical functions of a root kit. [6 marks] 9 (TURN OVER) CST.2014.4.10 9 Security I Block ciphers usually process 64 or 128-bit blocks at a time. To illustrate how their modes of operation work, we can use instead a pseudo-random permutation that operates on the 26 letters of the English alphabet: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 m A B C D E F G H I J K L M N O P Q R S T U V W X Y Z EK(m) P K X C Y W R S E J U D G O Z A T N M V F H L I B Q As the XOR operation is not defined on the set {A, . . . , Z}, we replace it here during encryption with modulo-26 addition (e.g., C D = F and Y C = A). (a) Encrypt the plaintext "TRIPOS" using: (i) electronic codebook mode; [2 marks] (ii) cipher-block chaining.