Internet Key Exchange (IKE) Key Management Requirements Internet Key Exchange (IKE) IKE Basic Philosophy Initial Exchange What Do We Have? Authentication

IPSec In Depth Encapsulated Security Payload (ESP) Must encrypt and/or authenticate in each packet Encryption occurs before authentication Authentication is applied to data in the IPSec header as well as the data contained as payload IPSec Encapsulating Security Payload (ESP) in Transport Mode IPSec ESP Tunnel Mode Authentication Header (AH) Authentication is applied to the entire packet, with Oct 31, 2013 · The IPsec NAT Traversal feature (NAT-T) introduces support for IPsec traffic to travel through NAT or PAT devices by encapsulating both the IPsec SA and the ISAKMP traffic in a UDP wrapper. NAT-T was first introduced in Cisco IOS version 12.2(13)T, and is auto-detected by VPN devices. IPSec By Maggie Zhou Oct, 2008 Basic concepts : 2 Basic concepts a suite of protocols for securing network connections network layer, layer 3 IPsec supports network-level peer authentication, data origin authentication, data integrity, data confidentiality (encryption), and replay protection IPsec has been deployed widely to implement Virtual Private Networks (VPNs) Virtual Private Network (VPN): Virtual Private Network (VPN) More and more across-country or worldwide companies due to global market there is a problem for all of them how to maintain fast, secure and reliable communications wherever their offices are Leased lines very May 27, 2019 · Internet Protocol Security (IPSec) is a framework of open standards for ensuring private, secure communications over Internet Protocol (IP) networks, through the use of cryptographic security services. IPSec is a suite of cryptography-based protection services and security protocols. The IP security architecture (IPsec) provides cryptographic protection for IP datagrams in IPv4 and IPv6 network packets. This protection can include confidentiality, strong integrity of the data, data authentication, and partial sequence integrity. known as replay protection. IPsec is performed inside the IP module.

SSL vs IPsec • Layer 3 (IPsec) theoretically better – SSL: Rogue packet problem • TCP by definition, not involved in crypto • So attacker can generate TCP with (noncrypto) good checksum – TCP will accept it – Real data will be discarded as duplicate • Only recourse: break the connection – In contrast, each IPsec pkt ind. protected

IPsec intercepts IP datagrams as they are passed down the protocol stack, provides security, and passes them to the data link layer. The advantage of this technique is that IPsec can be retrofitted to any IP device, since the IPsec functionality is separate from IP.

If IPsec processing is applied, there is a link from the SPD cache entry to the relevant SAD entry (specifying the mode, cryptographic algorithms, keys, SPI, PMTU, etc.). IPsec processing is as previously defined, for tunnel or transport modes and for AH or ESP, as specified in their respective RFCs [Ken05b and Ken05a].

ipsec.ppt - Free download as Powerpoint Presentation (.ppt), PDF File (.pdf), Text File (.txt) or view presentation slides online. IPSec Policy Phase 2 policies are defined in terms of proposals Each proposal: May contain one or more of the following AH sub-proposals ESP sub-proposals IPComp sub-proposals Along with necessary attributes such as Key length, life time, etc IPSec Policy Example In English: All traffic to must be: Use pre-hashed key Nov 06, 2014 · PHASE 2 ! access-list cptomap_vpn_siteb extended permit ip ! crypto ipsec security-association lifetime seconds 28800 crypto ipsec security-association lifetime kilobytes 4608000 crypto ipsec ikev1 transform-set ESP-3DES-MD5 esp-3des esp-md5- hmac ! S/MIME, PGP, Kerberos, SSL/HTTPS however there are security concerns that cut across protocol layers would like security implemented by the network for all applications IPSec general IP Security mechanisms provides authentication confidentiality key management applicable to use over LANs, across public & private WANs, & for the Internet IPSec IPsec is a whole family of connection protocols. Most of the time, IPSec is used with the key exchange protocols ikev1 (aka Cisco IPSec) or ikev2. L2TP/IPSec is less common nowadays. Like PPTP, IPSec is available “out of the box” in most modern operating systems. crypto ipsec transform-set MyTS esp-aes 256 esp-sha-hmac mode tunnel IPsec Transform Set crypto ipsec profile MyProfile set transform-set MyTS IPsec Profile interface Tunnel0 ip address tunnel source tunnel destination tunnel mode ipsec ipv4 tunnel protection ipsec profile MyProfile Virtual Tunnel IPSEC, short for IP Security, is a suite of protocols, standards, and algorithms to secure traffic over an untrusted network, such as the Internet. IPSEC is supported on both Cisco IOS devices and PIX Firewalls. IPSEC provides three core services: •Confidentiality– prevents the theft of data, using encryption.