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Cryptography |
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Cryptosystem |
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Encryption keys |
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Hashing, Hashing Message Authentication Codes (HMACs) |
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DES, 3DES, and AES ciphers |
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Message Digest 5 (MD5) and Secure Hashing Algorithm -1 (SHA-1) hashes |
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Certificate Authority (CA) |
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Digital certificates |
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Exam Topics Covered in This Chapter: |
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Explain the different methods used in cryptography |
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Explain IKE protocol functionality and phases |
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Describe the building blocks of IPSec and the security functions it provides |
Note
These exam topics are from cisco.com. Check there periodically for the latest exam topics and info.
This chapter provides an overview of the art and science of cryptography. Emphasis is on key points, especially where this knowledge is important in understanding cryptography’s implementation in virtual private networks (VPNs) and other IOS services that require cryptography. Chapter 7, “Virtual Private Networks with IPsec,” has more information on configuring VPNs. This chapter has a practical emphasis, with specific reference to examples of where cryptographic technology might be implemented in a modern cryptosystem, such as those found in Cisco Self-Defending Networks.