proxies-資料下載頁(yè)
2025-05-02 18:08本頁(yè)面
【導(dǎo)讀】Checksum,CRC-protectsintegrity. formulacalledaone-wayhashfunction.one-wayhashfunctions.Senderproduces:E=encrypt(K,M). Receiverextracts:M=decrypt(K,E). IfKisdiscovered,securityispromised. Considerexample:
【正文】 s extra layer of access – DeMilitarized Zone – DMZ Ethers connect works and puters controlled by different bodies. They may be external or internal. – External DMZ Ethers link regional works with routers to internal works. – Internal DMZ Ethers link local nodes with routers to the regional works. NAT ? Network address translation (NAT) boxes also add security – A hardware device currently being developed and used to extend the Inter addresses already in use. – NAT has been suggested as an alternative to adopting IPv6 (IPng). – It allows duplicate IP addresses to be used within a corporation and unique addresses outside. Summary ? Security is a problem because Inter is not owned by one entity ? Organizations can use firewalls to prevent unauthorized access ? Encryption and digital signatures can provide confidentiality and secure identification
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