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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?"
Users are familiar with some network services like HTTP (Hypertext Transport Protocol) - the Web; and SMTP. Tell us more about these services. How do they figure into organizational security? Elaborate with specifics.
If an attacker breaks into a corporate database, modifies some information and deletes critical files, against what security goal or goals is this attack aimed?
DNS Cache Poisoning attack, Turtle Shell Architecture,
Logic bombs, War dialing, Ping of death attack, steganography, RSA scheme, digital signature, A chain of certificates, A certificate revocation list, A trust anchor, asymmetric algorithm used by PGP, IPSec mode, IP virtual Private Networks
Authentic Assessment: The scenario will be a realistic, enterprise-level situation encompassing diverse networking components, including Microsoft Windows, Linux, VoIP, security, wireless, and Cisco technologies.
Below are ciphertext from Vigenere cipher. Determine plaintext and key. Give a clearly written description of steps you followed to decrypt each ciphertext.
Bob loves foreign languages and wants to plan his course schedule for the following years. He is interested in the following nine language courses: LA15, LA16, LA22, LA31, LA32, LA126, LA127, LA141.
TCO C states "Given a computer network for data transmission, identify and analyze possibilities for loss or modification of data. Write down the vulnerabilities of RPC? What are the present methods of securing RPC?
Security topology covers four primary areas of concern (design goals, security zones, technologies, and business requirements). Describe each area including key topics in each area. Discuss software threats.
Analyze security requirements and prepare a security policy.
block cipher and a stream cipher, Caesar cipher, cryptanalytic attacks, mono alphabetic cipher and a poly alphabetic cipher, Mix Columns, Add Round key, PGP services, traffic padding, contrast link and end-to-end encryption
Write a report on DENIAL OF SERVICE (DoS).
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