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Actually, I took this question from Matt Bishop's Introduction to Computer Security. The answer can be in any format but is preferred if it is short in points.
"The designers of the UNIX password algorithm used a 12-bit salt to perturb the first and third sets of 12 entries in the E-table of the UNIX hashing function (the DES). Consider a system with 224 users. Assume that each user is assigned a salt from a uniform random distribution and that anyone can read the password hashes and salts for the users.
What is the expected time to find all users' passwords using a dictionary attack?
Assume that eight more characters were added to the password and that the DES algorithm was changed so as to use all 16 password characters. What would be the expected time to find all users' passwords using a dictionary attack?
Assume that the passwords were eight characters long but that the salt length was increased to 24 bits. Again, the salts (and the corresponding algorithms) are known to all users. What would be the expected time to find all users' passwords using a dictionary attack?"
Dissect an email you have received. First, get the original, ASCII text of the email, including the headers, and the blank line separating the headers and the body of the email.
SSL Record protocol of the SSL protocol stack, RADIUS, networks for access control, DNS poisoning, Spear Phishing attacks, centralised or decentralised access control, encrypt email data
Using RSA User1 ciphers his text M with User2 public key and he gets the cipher text C=371 he sends the Ciphertext to User2 who decrypts the cophertext with his private key.
Using CBC mode of operation what are the consequences of decrypting the cipher text if it has an error in the first bit of the first block C?
List three controls that could be applied to detect or prevent salami attacks. Modularity can have a negative as well as a positive effect. A program that is overmodularized performs its operations in very small modules.
Sally generates key KA when required as KA = h(Alice,KS ),with keys KB and KC generated in similar manner. Explain one advantage and one disadvantage of key diversi?cation.
Concur with, dispute, or qualify following statement: "The strong ciphers produced by Enigma machine are result of complex mathematical trapdoor functions used to encrypt messages."
Based on the article by Lenning (2005), determine a primary security risk that users must acknowledge when using macros? Why is it significant to educate users of these risks once their dilemma is resolved?
Servers, administrative and support users 2 subnets with 50 hosts for faculty & student labs 10 or more WAN links for point-to-point home office address. Design the subnet?
Prepare a graph of the storage requirements for the project.
The pattern or generator is P 1001. Calculate the CRC or FCS for the sender. You must give the details of this calculation.
A report on Tools to enhance Password Protection.
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