kerberos 5584a556605cd
DESCRIPTION
Kerberos 5584a556605cdTRANSCRIPT
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KERBEROS: THE MIT’S COMPUTERNETWORK PROTOCOL AND ITS
DEVELOPMENT
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KERBEROS
Third Party Authenticat
Strong Cryptography
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Origin
GreekMythology
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Modern History
Massachusetts
's nstitute o!TechnologyPro"ect Athena
Ste#e Millerand Cli$ord
%eu&an
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evolution
Early Kereros (#)* #+*#,-
Kereros .
Kereros /
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BASC 0ESG%
Authentication Server
Ticket Granting Server
File Server
Key Distribution Center
CLIENT
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BASC 0ESG%
AS
TGS
FS
CLIENT
1ser%a&e2 gichyPass3ord2 )+,./4
56
Client Secret Key
One 3ay
7ash
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BASC 0ESG%
AS
TGS
FS
CLIENT
User gichy wants
to use !e ser"er
#$!ear
te%t&
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BASC 0ESG%
AS
TGS
FS
CLIENT
Checks i!client isin the
dataase
Generates theClient
SecretKey
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BASC 0ESG%
AS
TGS
FS
CLIENT
+ Messages
eing sent
A8 Client 9
TGSSession Key
B8 Ticket
GrantingTicketClientdecodes A21sing its
secret key
ClientCA%:T
decode B
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BASC 0ESG%
AS
TGS
FS
CLIENT
C8 TicketGranting
Ticket !ro&
B
08Authenticat
or
TGSdecrypts Cand gets
TicketGrantingTicket
TGSdecrypts 0
using
Client9TGSSession keyand getsClient 0
and
TGS checksthat Client 0
!ro& C&atches
Client 0 !ro&0 and
ti&esta&pdoes not
e;ceed ticket#alidity
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BASC 0ESG%
AS
TGS
FS
CLIENT
E8 Client<to<=S ticket=8Client9Ser#er Session
Key
Clientdecodes =
usingClient9TGS
session key*otains
Client9Ser#er Session
Key
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BASC 0ESG%
AS
TGS
FS
CLIENT
E8 Client<to<=S ticket
G8Authenticat
or
=S decryptsE
=S decryptsG
=S checksthat Client 0
!ro& E&atches
Client 0 !ro&G and
ti&esta&pdoes not
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BASC 0ESG%
AS
TGS
FS
CLIENT
78 The
ti&esta&p!ound in G>
encrypted
3ith theClient9Ser#er Session
Key
Clientdecrypts 7
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BASC 0ESG%
AS
TGS
FS
CLIENT
Client
issuesser#icere?uest to
the =S
=S ser#ices
the re?uest
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O%C@1SO
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an( )ou