Which encryption communication protocols does IPSec support and what are their differences

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IPSec supports Authentication Header (AH) and Encapsulating Security Payload (ESP) protocols. The differences between these protocols are:

-AH: provides data origin authentication, data integrity check, and the anti-replay services. The sender performs the hash algorithm on the IP payload and all header fields of an IP packet except for variable fields to generate a message digest. The receiver recalculates the message digest according to the received IP packet and compares the two message digests to determine whether the IP packet has been modified during transmission. AH does not encrypt the IP payload. AH is applicable to transmit non-confidential data.

-ESP: encrypts the IP payload in addition to providing all the functions of AH. ESP can encrypt and authenticate the IP payload but does not protect the IP packet header. ESP can be used to transmit confidential data.

AH and ESP can be used independently or together. When AH and ESP are used together, ESP encapsulation and then AH encapsulation are performed on an IP packet to enhance security.

Other related questions:
Which encryption protocols does an AR support
AR routers support the Authentication Header (AH) and Encapsulating Security Payload (ESP) protocols. Their differences are as follows: - AH: provides data origin authentication, data integrity check, and anti-replay services. The sender performs the hash algorithm on the IP payload and all header fields of an IP packet except for variable fields to generate a message digest. The receiver recalculates the message digest according to the received IP packet and compares the two message digests to determine whether the IP packet has been modified during transmission. AH does not encrypt the IP payload. It applies to non-confidential data transmission. - ESP: encrypts the IP payload in addition to providing all the functions of AH. ESP can encrypt and authenticate the IP payload but does not protect the IP packet header. It applies to non-confidential data transmission. AH and ESP can be used independently or together. When AH and ESP are used together, ESP encapsulation and then AH encapsulation are performed on an IP packet to be sent, providing higher security.

Which encryption protocols does the AR support
The AR supports Authentication Header (AH) and Encapsulating Security Payload (ESP) protocols. Their differences are as follows: -AH: provides data origin authentication, data integrity check, and anti-replay. The sender performs the hash algorithm on the IP payload and all header fields of an IP packet except for variable fields to generate a message digest. The receiver recalculates the message digest according to the received IP packet and compares the two message digests to determine whether the IP packet has been modified during transmission. AH does not encrypt the IP payload. AH applies to non-confidential data transmission. -ESP: provides data encryption in addition to the functions provided by the AH protocol. ESP can encrypt and authenticate the IP payload but does not protect the IP packet header. ESP applies to confidential data transmission. AH and ESP can be used independently or together. When AH and ESP are used together, ESP and AH headers are encapsulated in sequence, enhancing security.

Which Protocols Does a Security Group Support?

The protocol used by a security group can be set to TCP, UDP, ICMP, or ANY. ANY indicates that the security group takes effect for all protocols. If the TCP or UDP protocol is selected, configure ports 1 to 65535 for the protocols to access the security group. If the ICMP protocol is selected, you can set the ICMP protocol type. The default value is ANY.


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