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IPSecurity (¿µ¹®)

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2019.09.20
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32 page / 217.2 KB
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  • Microsoft PowerPoint (pptx)Microsoft PowerPoint (pptx)
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  introduction  1  internet threats  packet sniffing  
an adversary covertly listens to communication and data
flowing over the internet  loss of data integrity  
an adversary can tamper data even though he or she cannot read the data flowing
identity spoofing  
an adversary can spoof the identity of the source
replay old packets  
an adversary may not be able to read or tamper data.however, he or she can replay stale data
  introduction  2  ip security (ipsec)  
a method proposed to solve the attacks mentioned on the previous slide through interaction with the network layer
supporting a variety of application scenarios is that it can encrypt or authenticate all traffic at the ip level
all distributed applications, including remote login, client/server, e-mail, file transfer, web access, and so on, can be secured
  introduction  ip security (ipsec)  
-scenario
3    ipsec architecture and components  4  ipsec security function  data confidentiality  data integrity  origin identification  replay attack prevention  ipsec adoption form  
ipsec mechanisms are designed to be algorithm independent in
order to accommodate the best cryptographic algorithms
host-to-host communication  gateway-to-gateway communication  host-to-gateway communication    ipsec architecture and components  5  ipsec components  authentication header (ah)  an authentication-only function  encapsulating security payload (esp)  
a combined authentication and encryption function
security associations (sas)  
represent an agreement between two peers on a set of security services to be applied to the ip traffic stream between these nodes
key management infrastructure  setting up sa between two communicating peers    ipsec architecture and components  6  authentication header  
supporting for data integrity and authentication of ip packets
data integrity feature  
ensuring that undetected modification to the content of a packet in transit is not possible
authentication feature  
enables an end system or network device to authenticate the user or application and filter traffic accordingly
preventing the address spoofing attacks observed on today¡¯s
internet  guarding against replay attacks    ipsec architecture and components  7  authentication header  ah format  next header (8 bits)  
identifying the type of header immediately following this header   (ÀÌÇÏ »ý·«)

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