ipsec - IPSEC Protocols Internet Security Association and...

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IP SEC packetlife.net Protocols Internet Security Association and Key Management Protocol (ISAKMP) · A framework for the negotiation and management of security associations between peers; traverses UDP port 500 Internet Key Exchange (IKE) · Responsible for key agreement using public key cryptography Encapsulating Security Payload (ESP) · Provides data encryption, data integrity, and peer authentication; IP protocol 50 Authentication Header (AH) · Provides data integrity and peer authentication, but not data encryption; IP protocol 51 IPsec Modes Transport Mode · The ESP or AH header is inserted behind the IP header; the IP header can be authenticated but not encrypted Tunnel Mode · A new IP header is created in place of the original; this allows for encryption of the entire original packet Encryption Algorithms Type Key Strength DES Symmetric 56-bit Weak 3DES Symmetric 168-bit Medium AES Symmetric 128, 192, or 256-bit Strong RSA Asymmetric 1024-bit minimum Strong Hashing Algorithms
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