Final Exam Research Paper Example | Topics and Well Written Essays - 1000 words

Final Exam - Research Paper Example On the other hand, bblowfish is a symmetric block cipher and operates in 64-bit block size and a variable key length - from 32 bits to 448bits with 16-round Feistel cipher and uses large key-dependent S-boxes. Moreover it encrypts data on a 32-bit processor at the rate of 18 clock cycles/byte and can run in less than 5K of memory. It is easy to implement The algorithm used in RC4 initialization phase is a key scheduling algorithm(KSA). This algorithm takes the secret key K of length l as the input and begins with the initialization of the internal state S to set it as identity permutation and then uses the key K to generate a random permutation. Thus the algorithm can be summed up as Upon initialization, the internal state S would be [0 1 2 3 †¦ N-1]. During the next step, the value of j is calculated as j = (j + S[i] + K[i mod l]) mod N. Upon swapping value in S[i] becomes value in S[j] and vice versa. From this, it is clear that, only way to keep the initial permutation state unchanged is to keep the value of i and j equal. In order to do that, the value of k should be chosen in such a way that, whenever j is calculated using this formula, it always needs to be equal to the value of i. Upon investing the formula, if we make the values within the bracket i.e j = (j + S[i] + K[i mod l]) mod N equal to N+ i, then upon Mod the result will be equal to i. Upon analysis, we can say(in this case): j+i+K[i], since the value of j depends on itself which in turn depends on the previous value of S[i] (=i) we can say that j will increment to a minimum value of i+(i-1) (Except for i=0) for each iteration. Hence 2i-1+K = N+i. Assuming N =256, we can say K should be equal to 257-i except for i=0, in which case it can be either 256 or 0 to achieve the desired result. Now K takes: Answer: It is not possible to perform encryption operations in parallel on multiple blocks of plaintext in DES CBC mode because in

Media Relations Assignment Example | Topics and Well Written Essays - 250 words - 6

Media Relations - Assignment Example In the letter, the administration assures them that it does everything in its power to ensure that the well being, security and safety of all the children in Horace Mann are a top priority (Horace Mann school website, 2012). After the publishing of the article, the school should distant itself from the previous administration, by clarifying that it is now under new administration. Arguing that the current society has changed with sexual talk and sex education between parents and children. This makes the children aware of the wrong kind of touch and would report if they experienced any. Even Amos Kamil recognized that the atrocities that happened during his days cannot happen in the current time because of the transparency that exists in society (Kamil, 2012). The Horace Mann administration should emphasize that the writer himself was not abused and that most of the alumni were not either, but the few who were abused makes it unfortunate. It should, therefore, address all the parents and assure them that such an incidence will never happen again to their children and that they are in safe hands (Ridgway,