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figure 319 in the text shows that des creates 16 different 48-bit keys one for each round why do we need 16 different
1 if alice and bob need to communicate using asymmetric-key cryptography how many keys do they need who needs to create
1 in rsa why cant bob choose 1 as the public key e2 what is the role of the secret key added to the hash function in
1 distinguish message authentication and entity authentication2 alice signs the message she sends to bob to prove that
1 assume alice needs to send a confidential signed document to 100 people how many keys does alice need to use to
atbash was a popular cipher among biblical writers in atbash a is encrypted as z b is encrypted as y and so on
one of the attacks an intruder can apply to a simple cipher like an additive cipher is called the ciphertext attack in
another method used in a ciphertext attack see previous problem is called the statistical approach in which the
each round in a block cipher should be invertible to make the whole block invertible modern block ciphers use two
the key in des is 56 bits assume eve the intruder tries to find the key using a brute-force attack tries all of the
assume bob using the rsa cryptosystem selects p 11 q 13 and d 7 which of the following can be the value of public
in rsa given p 107 q 113 e 13 and d 3653 encrypt the message this is tough using 00 to 26 a 00 and space 26 as the
a cryptographic hash function needs to be second preimage resistant which means that given the message m and the
1 explain why private-public keys cannot be used in creating a mac2 the nonce in figure 3122 is to prevent a replay of
assume you want to write a program to simulate the permutation boxes in figure 318 in the texta show how you represent
the swap operation is one of the components of the modern block ciphersa swap the word 100110112b swap the word
1 are both ah and esp needed for ip security why or why not2 what are the two protocols discussed in this chapter that
1 what are the names of the protocols discussed in this chapter that provide security for e-mail2 how does pgp create a
1 what are the two types of firewalls2 what is a vpn and why is it needed3 how do lans on a fully private internet
1 when we talk about authentication in ipsec do we mean message authentication or entity authentication explain2 if
1 can we use ssl with udp explain2 why is there no need for a security association with ssl3 compare and contrast pgp
1 we defined two security services for e-mail pgp and smime explain why e-mail applications cannot use the services of
1 assume alice needs to send an e-mail to bob explain how the confidentiality of the e-mail is achieved using pgp2
1 assume alice needs to send an e-mail to bob explain how the confidentiality of the e-mail is achieved using smime2
assignmentnbsp 1electric fields dielectrics generation and measurements of hvdc amp hvac1 for a coaxial cylindrical