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Decryption Speed
A certain cryptography vendor was providing an encryption technology that was breakable within 10 hours. Considering the continuous increase in computer speed, the company decided to increase the size of the encryption key so that the time to break the encryption become more than 250 hours. What should be the minimum key size increase to meet this objective?
Hint: Normally, the increase of a single bit in the size of the encryption key doubles the amount of needed computations.
If IPSec provides security at the network layer, why is it that security mechanisms are still needed at layers above IP?
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 two- page letter to describe what security threats she is facing and how she can decraese these threats. Remember that you are writing for friend, not for a teacher.
Define Physical secuirty and three types of threats related with physical security. Write down the steps in designing and choosing a secure site in detail.
The topic, may be of your interest, needs to be approved in advance by the course convenor Dr Xin-Wen Wu; other than that, there are no restrictions.
Defacement, Infiltration, Phishing, Pharming, Insider Threats, Click Fraud, Denial of Service, Data Theft/Loss, IP Whitelisting and IP Spoofing, recursive PHP functio, worm and a virus, hash on a string using MD5
Originally Linux/UNIX systems had one all-powerful user called root that managed systems. Discuss the risks of having a single root user and how more limited management abilities can be given to others users on Linux/UNIX systems.
What is your understanding of the difference between a stream cipher and a block cipher?
the relation between passwords and key size. For this purpose we consider a cryptosystem where the user enters a key in the form of a password
Generates an alternative message that has a hash value that collides with Bob's original hash value. Show a message that Alice may have spoofed, and demonstrate that its hash value collides with Bob's original hash."
If Bob receives M and S, describe process Bob will use to verify signature. Illustrate that in this case signature verification will succeed.
Write 700-1050 word paper explaining hardware and software used to support personal, workgroup, and enterprise computing within current organization, an organization.
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