How Does Ipsec Prevent Replay Attacks?
Share
Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
IPSec prevents replay attacks by using two main techniques: packet sequence numbering and replay windowing. Packet sequence numbering works by assigning each packet a unique sequence number, which is encrypted and checked by the receiving host. If the sequence number of a packet is out of order or is duplicated, the receiving host will not accept it. Windowing works by allowing only a certain number of packets to be accepted within a specified time interval. Any packets outside of this window will be discarded and not accepted.
IPSec prevents replay attacks by using cryptographic techniques such as replay detection and anti-replay window. Replay detection is a mechanism that compares packets to each other based on their sequence number. If it detects a duplicate or out of order packet, it will drop the packet. Anti-replay window allows only a certain number of packets to be sent before an expiration number is reached, thus preventing the malicious user from sending the same packet over and over again.