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                           <rdf:li><rdf:Description xmpDM:name="Key Management and Distribution Raj Jain Washington University in Saint Louis Saint Louis, MO 63130 Jain@cse.wustl.edu" xmpDM:startTime="0" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Audio/Video recordings of this lecture are available at: http://www.cse.wustl.edu/~jain/cse571-17/" xmpDM:startTime="0" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="" xmpDM:startTime="0" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Overview Distribution of Private Keys Distribution of Public Keys Public Key Infrastructure: PKI and PKIX X.509" xmpDM:startTime="9800" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Certificates Certificate revocation These slides are based partly on Lawrie Brown’s slides supplied with William Stallings’s book “Cryptography and Network" xmpDM:startTime="9800" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Security: Principles and Practice,” 7th Ed, 2017." xmpDM:startTime="9800" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="" xmpDM:startTime="9800" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Key Distribution Symmetric schemes require parties to share a secret key n Parties  n(n-1)/2 pairs  n(n-1)/2 keys Public" xmpDM:startTime="37467" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="key schemes require parties to acquire valid public keys." xmpDM:startTime="37467" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="How to trust a public key? Once “master” secret keys are setup, they are used only to exchange “session” secret" xmpDM:startTime="37467" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="keys." xmpDM:startTime="37467" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Session keys are used for a short time and then discarded." xmpDM:startTime="37467" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="A B I am A." xmpDM:startTime="37467" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="My nonce is N1 Let’s use session key Ks." xmpDM:startTime="37467" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="My nonce is N2." xmpDM:startTime="37467" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="I am able to decrypt using the key." xmpDM:startTime="37467" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Here is a fn of your Nonce." xmpDM:startTime="37467" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="IDA || N1 E(Km, [Ks || IDA || IDB || f(N1) || N2]) E(Ks, f(N2)) B Ref: http://en.wikipedia.org/wiki/Key_distribution" xmpDM:startTime="37467" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="" xmpDM:startTime="37467" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Key Distribution Using KDC Central authority: “Key Distribution Center” (KDC) Everyone has a shared secret key with KDC Hierarchies of" xmpDM:startTime="392167" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="KDC’s required for large networks IDA || IDB || N1 E(Ka, [Ks || IDA || IDB || N1]) || E(Kb," xmpDM:startTime="392167" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="[Ks || IDA]) E(Kb, [Ks || IDA]) E(Ks, N2) E(Ks, f(N2)) Hi I am A." xmpDM:startTime="392167" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="I want to talk to B." xmpDM:startTime="392167" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="My Nonce is N1." xmpDM:startTime="392167" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Here is the session key and a message for B Hi B, I want to talk to you." xmpDM:startTime="392167" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Here is a ticket from KDC." xmpDM:startTime="392167" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Ok." xmpDM:startTime="392167" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Here is my nonce." xmpDM:startTime="392167" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Prove that you can decrypt it." xmpDM:startTime="392167" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Here is a function of your nonce." xmpDM:startTime="392167" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="A B KDC Ref: http://en.wikipedia.org/wiki/Key_distribution_center" xmpDM:startTime="392167" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="" xmpDM:startTime="392167" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Key Distribution Using Public Keys Public key cryptosystems are inefficient So almost never used for direct data encryption Rather used" xmpDM:startTime="711500" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="to encrypt secret keys for distribution This scheme is subject to man in the middle attack Hi I am A." xmpDM:startTime="711500" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="My public key is PUA PUA || IDA Here is the session key KS E(PUA, KS) A B Ref: http://en.wikipedia.org/wiki/Man-in-the-middle_attack" xmpDM:startTime="711500" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="" xmpDM:startTime="711500" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Key Distribution Using KDC Central authority: “Key Distribution Center” (KDC) Everyone has a shared secret key with KDC Hierarchies of" xmpDM:startTime="716967" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="KDC’s required for large networks IDA || IDB || N1 E(Ka, [Ks || IDA || IDB || N1]) || E(Kb," xmpDM:startTime="716967" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="[Ks || IDA]) E(Kb, [Ks || IDA]) E(Ks, N2) E(Ks, f(N2)) Hi I am A." xmpDM:startTime="716967" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="I want to talk to B." xmpDM:startTime="716967" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="My Nonce is N1." xmpDM:startTime="716967" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Here is the session key and a message for B Hi B, I want to talk to you." xmpDM:startTime="716967" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Here is a ticket from KDC." xmpDM:startTime="716967" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Ok." xmpDM:startTime="716967" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Here is my nonce." xmpDM:startTime="716967" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Prove that you can decrypt it." xmpDM:startTime="716967" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Here is a function of your nonce." xmpDM:startTime="716967" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="A B KDC Ref: http://en.wikipedia.org/wiki/Key_distribution_center" xmpDM:startTime="716967" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="" xmpDM:startTime="716967" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Key Distribution Symmetric schemes require parties to share a secret key n Parties  n(n-1)/2 pairs  n(n-1)/2 keys Public" xmpDM:startTime="717667" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="key schemes require parties to acquire valid public keys." xmpDM:startTime="717667" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="How to trust a public key? Once “master” secret keys are setup, they are used only to exchange “session” secret" xmpDM:startTime="717667" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="keys." xmpDM:startTime="717667" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Session keys are used for a short time and then discarded." xmpDM:startTime="717667" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="A B I am A." xmpDM:startTime="717667" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="My nonce is N1 Let’s use session key Ks." xmpDM:startTime="717667" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="My nonce is N2." xmpDM:startTime="717667" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="I am able to decrypt using the key." xmpDM:startTime="717667" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Here is a fn of your Nonce." xmpDM:startTime="717667" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="IDA || N1 E(Km, [Ks || IDA || IDB || f(N1) || N2]) E(Ks, f(N2)) B Ref: http://en.wikipedia.org/wiki/Key_distribution" xmpDM:startTime="717667" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="" xmpDM:startTime="717667" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Key Distribution Using KDC Central authority: “Key Distribution Center” (KDC) Everyone has a shared secret key with KDC Hierarchies of" xmpDM:startTime="724567" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="KDC’s required for large networks IDA || IDB || N1 E(Ka, [Ks || IDA || IDB || N1]) || E(Kb," xmpDM:startTime="724567" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="[Ks || IDA]) E(Kb, [Ks || IDA]) E(Ks, N2) E(Ks, f(N2)) Hi I am A." xmpDM:startTime="724567" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="I want to talk to B." xmpDM:startTime="724567" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="My Nonce is N1." xmpDM:startTime="724567" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Here is the session key and a message for B Hi B, I want to talk to you." xmpDM:startTime="724567" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Here is a ticket from KDC." xmpDM:startTime="724567" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Ok." xmpDM:startTime="724567" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Here is my nonce." xmpDM:startTime="724567" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Prove that you can decrypt it." xmpDM:startTime="724567" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Here is a function of your nonce." xmpDM:startTime="724567" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="A B KDC Ref: http://en.wikipedia.org/wiki/Key_distribution_center" xmpDM:startTime="724567" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="" xmpDM:startTime="724567" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Key Distribution Using Public Keys Public key cryptosystems are inefficient So almost never used for direct data encryption Rather used" xmpDM:startTime="725567" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="to encrypt secret keys for distribution This scheme is subject to man in the middle attack Hi I am A." xmpDM:startTime="725567" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="My public key is PUA PUA || IDA Here is the session key KS E(PUA, KS) A B Ref: http://en.wikipedia.org/wiki/Man-in-the-middle_attack" xmpDM:startTime="725567" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="" xmpDM:startTime="725567" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Secret Key Distribution with Confidentiality and Authentication Hi I am A." xmpDM:startTime="837900" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="My nonce is N1." xmpDM:startTime="837900" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="E(PUB, [N1 || IDA]) Here is my nonce." xmpDM:startTime="837900" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Prove that you have private key for A E(PUA, [N1 || N2]) Here is your nonce." xmpDM:startTime="837900" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="E(PUB, N2) Now that we know each other." xmpDM:startTime="837900" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Let’s use session key KS." xmpDM:startTime="837900" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="E(PUB, E(PRA, KS)) A B" xmpDM:startTime="837900" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Key Distribution Using Public Keys Public key cryptosystems are inefficient So almost never used for direct data encryption Rather used" xmpDM:startTime="920567" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="to encrypt secret keys for distribution This scheme is subject to man in the middle attack Hi I am A." xmpDM:startTime="920567" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="My public key is PUA PUA || IDA Here is the session key KS E(PUA, KS) A B Ref: http://en.wikipedia.org/wiki/Man-in-the-middle_attack" xmpDM:startTime="920567" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="" xmpDM:startTime="920567" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Key Distribution Using KDC Central authority: “Key Distribution Center” (KDC) Everyone has a shared secret key with KDC Hierarchies of" xmpDM:startTime="920800" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="KDC’s required for large networks IDA || IDB || N1 E(Ka, [Ks || IDA || IDB || N1]) || E(Kb," xmpDM:startTime="920800" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="[Ks || IDA]) E(Kb, [Ks || IDA]) E(Ks, N2) E(Ks, f(N2)) Hi I am A." xmpDM:startTime="920800" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="I want to talk to B." xmpDM:startTime="920800" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="My Nonce is N1." xmpDM:startTime="920800" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Here is the session key and a message for B Hi B, I want to talk to you." xmpDM:startTime="920800" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Here is a ticket from KDC." xmpDM:startTime="920800" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Ok." xmpDM:startTime="920800" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Here is my nonce." xmpDM:startTime="920800" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Prove that you can decrypt it." xmpDM:startTime="920800" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Here is a function of your nonce." xmpDM:startTime="920800" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="A B KDC Ref: http://en.wikipedia.org/wiki/Key_distribution_center" xmpDM:startTime="920800" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="" xmpDM:startTime="920800" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Key Distribution Symmetric schemes require parties to share a secret key n Parties  n(n-1)/2 pairs  n(n-1)/2 keys Public" xmpDM:startTime="921000" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="key schemes require parties to acquire valid public keys." xmpDM:startTime="921000" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="How to trust a public key? Once “master” secret keys are setup, they are used only to exchange “session” secret" xmpDM:startTime="921000" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="keys." xmpDM:startTime="921000" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Session keys are used for a short time and then discarded." xmpDM:startTime="921000" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="A B I am A." xmpDM:startTime="921000" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="My nonce is N1 Let’s use session key Ks." xmpDM:startTime="921000" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="My nonce is N2." xmpDM:startTime="921000" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="I am able to decrypt using the key." xmpDM:startTime="921000" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Here is a fn of your Nonce." xmpDM:startTime="921000" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="IDA || N1 E(Km, [Ks || IDA || IDB || f(N1) || N2]) E(Ks, f(N2)) B Ref: http://en.wikipedia.org/wiki/Key_distribution" xmpDM:startTime="921000" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="" xmpDM:startTime="921000" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Overview Distribution of Private Keys Distribution of Public Keys Public Key Infrastructure: PKI and PKIX X.509" xmpDM:startTime="921167" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Certificates Certificate revocation These slides are based partly on Lawrie Brown’s slides supplied with William Stallings’s book “Cryptography and Network" xmpDM:startTime="921167" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Security: Principles and Practice,” 7th Ed, 2017." xmpDM:startTime="921167" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="" xmpDM:startTime="921167" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Key Distribution Symmetric schemes require parties to share a secret key n Parties  n(n-1)/2 pairs  n(n-1)/2 keys Public" xmpDM:startTime="922267" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="key schemes require parties to acquire valid public keys." xmpDM:startTime="922267" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="How to trust a public key? Once “master” secret keys are setup, they are used only to exchange “session” secret" xmpDM:startTime="922267" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="keys." xmpDM:startTime="922267" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Session keys are used for a short time and then discarded." xmpDM:startTime="922267" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="A B I am A." xmpDM:startTime="922267" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="My nonce is N1 Let’s use session key Ks." xmpDM:startTime="922267" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="My nonce is N2." xmpDM:startTime="922267" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="I am able to decrypt using the key." xmpDM:startTime="922267" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Here is a fn of your Nonce." xmpDM:startTime="922267" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="IDA || N1 E(Km, [Ks || IDA || IDB || f(N1) || N2]) E(Ks, f(N2)) B Ref: http://en.wikipedia.org/wiki/Key_distribution" xmpDM:startTime="922267" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="" xmpDM:startTime="922267" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Key Distribution Using KDC Central authority: “Key Distribution Center” (KDC) Everyone has a shared secret key with KDC Hierarchies of" xmpDM:startTime="930833" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="KDC’s required for large networks IDA || IDB || N1 E(Ka, [Ks || IDA || IDB || N1]) || E(Kb," xmpDM:startTime="930833" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="[Ks || IDA]) E(Kb, [Ks || IDA]) E(Ks, N2) E(Ks, f(N2)) Hi I am A." xmpDM:startTime="930833" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="I want to talk to B." xmpDM:startTime="930833" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="My Nonce is N1." xmpDM:startTime="930833" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Here is the session key and a message for B Hi B, I want to talk to you." xmpDM:startTime="930833" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Here is a ticket from KDC." xmpDM:startTime="930833" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Ok." xmpDM:startTime="930833" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Here is my nonce." xmpDM:startTime="930833" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Prove that you can decrypt it." xmpDM:startTime="930833" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Here is a function of your nonce." xmpDM:startTime="930833" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="A B KDC Ref: http://en.wikipedia.org/wiki/Key_distribution_center" xmpDM:startTime="930833" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="" xmpDM:startTime="930833" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Key Distribution Using Public Keys Public key cryptosystems are inefficient So almost never used for direct data encryption Rather used" xmpDM:startTime="931167" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="to encrypt secret keys for distribution This scheme is subject to man in the middle attack Hi I am A." xmpDM:startTime="931167" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="My public key is PUA PUA || IDA Here is the session key KS E(PUA, KS) A B Ref: http://en.wikipedia.org/wiki/Man-in-the-middle_attack" xmpDM:startTime="931167" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="" xmpDM:startTime="931167" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Secret Key Distribution with Confidentiality and Authentication Hi I am A." xmpDM:startTime="932233" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="My nonce is N1." xmpDM:startTime="932233" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="E(PUB, [N1 || IDA]) Here is my nonce." xmpDM:startTime="932233" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Prove that you have private key for A E(PUA, [N1 || N2]) Here is your nonce." xmpDM:startTime="932233" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="E(PUB, N2) Now that we know each other." xmpDM:startTime="932233" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Let’s use session key KS." xmpDM:startTime="932233" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="E(PUB, E(PRA, KS)) A B" xmpDM:startTime="932233" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Hybrid Key Distribution Retain use of private-key KDC Shares secret master key with each user Distributes session key using master" xmpDM:startTime="952533" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="key Public-key used to distribute master keys Especially useful with widely distributed users Rationale Performance Backward compatibility" xmpDM:startTime="952533" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Secret Key Distribution with Confidentiality and Authentication Hi I am A." xmpDM:startTime="976200" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="My nonce is N1." xmpDM:startTime="976200" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="E(PUB, [N1 || IDA]) Here is my nonce." xmpDM:startTime="976200" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Prove that you have private key for A E(PUA, [N1 || N2]) Here is your nonce." xmpDM:startTime="976200" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="E(PUB, N2) Now that we know each other." xmpDM:startTime="976200" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Let’s use session key KS." xmpDM:startTime="976200" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="E(PUB, E(PRA, KS)) A B" xmpDM:startTime="976200" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Hybrid Key Distribution Retain use of private-key KDC Shares secret master key with each user Distributes session key using master" xmpDM:startTime="986267" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="key Public-key used to distribute master keys Especially useful with widely distributed users Rationale Performance Backward compatibility" xmpDM:startTime="986267" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Distribution of Public Keys Public announcement: Forgery possible Publicly available directory: Message can be tampered with." xmpDM:startTime="1013800" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Public-key authority: users know public key for the directory I want to talk B." xmpDM:startTime="1013800" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Time is T1 Request || T1 Here is the certified public key for B E(PRauth, [PUB || Request || T1])" xmpDM:startTime="1013800" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Hi, I am A." xmpDM:startTime="1013800" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="My nonce is N1." xmpDM:startTime="1013800" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="E(PUB, [IDA || N1]) Requires real-time access to directory when keys are needed A Authority B Time is T2." xmpDM:startTime="1013800" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="What’s A’s public key? Request || T2 Here is the certified public key for A E(PRauth, [PUA || T2]) Here" xmpDM:startTime="1013800" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="is my nonce." xmpDM:startTime="1013800" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Prove that you are A." xmpDM:startTime="1013800" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="E(PUA, [N1 || N2]) I was able to decrypt." xmpDM:startTime="1013800" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="Here is your nonce." xmpDM:startTime="1013800" xmpDM:duration="1000"/></rdf:li><rdf:li><rdf:Description xmpDM:name="E(PUB, N2)" xmpDM:startTime="1013800" xmpDM:duration="1000"/></rdf:li></rdf:Seq>
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