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problemprior to the introduction of ieee 80211i the security scheme for ieee 80211 was wired equivalent privacy wep wep
problemfor wep data integrity and data confidentiality are achieved using the rc4 stream encryption algorithm the
problem1 in a public-key system using rsa you intercept the ciphertext c 10 sent to a user whose public key is e 5n
problemsuppose bob uses the rsa cryptosystem with a very large modulus n for which the factorization cannot be found in
problemconsider a diffie-hellman scheme with a common prime q 11 and a primitive root a 2a if user a has public key
problem1 list four functions supported by smime2 what is radix-64 conversion3 why is radix-64 conversion useful for an
problem1 what is dkim2 what protocols comprise ssl3 what is the difference between and ssl connection and an ssl
problem1 what services are provided by the ssl record protocol2 what is the purpose of https3 what services are
problem1 what is an ipsec security association2 what are two ways of providing authentication in ipsec3 in ssl and tls
problemconsider the following threats to web security and describe how each is countered by a particular feature of
problema replay attack is one in which an attacker obtains a copy of an authenticated packet and later transmits it to
problemipsec esp can be used in two different modes of operation in the first mode esp is used to encrypt and
problemconsider radix-64 conversion as a form of encryption in this case there is no key but suppose that an opponent
probleman alternative to the radix-64 conversion in smime is the quoted-printable transfer encoding the first two
problem1 what are the principal elements of a kerberos system2 what is kerberos realm3 what are the differences between
problem1 what is x5092 what key elements are included in a x509 certificate3 what is the role of a ca in x5094 what
problemconsider a feistel cipher composed of 16 rounds with block length 128 bits and key length 128 bits suppose that
problemfor any block cipher the fact that it is a nonlinear function is crucial to its security to see this suppose
problem1 what rc4 key value will leave s unchanged during initialization that is after the initial permutation of s the
problemrc4 has a secret internal state which is a permutation of all the possible values of the vector s and the two
problemcbc-pad is a block cipher mode of operation used in the rc5 block cipher but it could be used in any block
problemkey distribution schemes using an access control center andor a key distribution center have central points
problemsuppose that someone suggests the following way to confirm that the two of you are both in possession of the
problema management briefing lists the following as the top five actions that to improve privacy compare these
problem1 what are the essential ingredients of a symmetric cipher2 what are the two basic functions used in encryption