Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Write Pseudocode for the password guessing algorithm:
Consider the following authentication protocol:
Client
Transmission
Host
Explanation
U, user
U à
I am user U
ß {n, DES, SHA-1}
n, random challenge, DES, SHA-1
- I have SHA_1(P(U)), where P(U) is password of user U
- Here is a random challenge n, please use DES and SHA-1 to generate a response
r=DES(n, SHA-1(P))
U, rà
Response r is the encryption of the hash of the password P of user U using key n, DES for encryption, and SHA-1 for hashing.
ß yes/no
Compare: DES-1(n, r) to SHA_1(P(U))
Can the password of user U be obtained by using an offline password guessing attack? If your answer is yes, describe the attack and write pseudocode for the password guessing algorithm. If your answer is no, describe why the protocol is resistant to an offline guessing attack.
2) Using RSA, perform an encryption then a decryption of the message M=5 using p=3, q=11, and e=7. (please add explanation, Show all your work, not just the final answer.)
3) You are the designer of a password security policy that requires passwords to expire once they have a probability of 0.001 of being guessed. A potential attacker can test 1,000,000 passwords per second. If you chose passwords to be alphanumeric ("A" through "Z", "a" through "z", and "0" through "9"), what would you have to set the maximum lifetime of a password to in order to meet the required guessing probability (represent in days)?Assume the password size is 9 characters.
Explain TCP congestion control.
Question: (a) Explain the following security services: Confidentiality, Availability. (b) Which attack will be used to bypass even the best physical and logical security m
Question: (a) Describe how IPSec provides data source authentication. (b) Which protocol can be used to provide limited traffic analysis confidentiality? Why is it "limite
#ON A lan wher r ip datagrams transported?
Question: (a) Which of the following is not a goal of security: i) detection ii) prevention iii) recovery iv) prosecution (b) You are an honest student. One day you
Problem (a) The IEEE 802 series of standards describe both the Physical and Data Link layers of their respective technologies. Two important standards are 802.3 and 802.5, respect
Question An organization is planning to connect its networks to the Internet. The network is located within a four story building. A web server supporting online sales is also
Your rules should ensure that Internet access will be restricted to the following: Only the following services will be permitted as OUTBOUND traffic (to the Internet from the DM
Wireless Networks The origin of wireless networks and their ubiquity in the technological environment poses a new type of exposure and vulnerability for network security. Cont
What are Transmission Impairments? Explain the following concepts with respect to Transmission Impairments a) Attenuation b) Delay Distortion c) Noise ion #Minimum 100 words ac
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd