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Fat AP and Cloud AP V200R008C00 CLI-based Configuration Guide

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Defense Against Brute Force Attacks on Keys

Defense Against Brute Force Attacks on Keys

The brute force method is to search for a password by trying to use all possible password combinations. This method is also called the exhaustive attack method. For example, a 4-digit password that contains only digits may have a maximum of 10,000 combinations. The password can be decrypted after a maximum of 10,000 attempts. In theory, the brute force method can decrypt any password. The only problem is how to shorten the time used to decrypt a password. When a WLAN uses WPA/WPA2-PSK, WAPI-PSK, or WEP-Shared-Key as the security policy, attackers can use the brute force method to decrypt the password.

Defense against brute force attacks on key can prolong the time used to decrypt passwords to improve password security. An RU checks whether the number of key negotiation attempts during WPA/WPA2-PSK, WAPI-PSK, or WEP-Shared-Key authentication exceeds the configured threshold. If so, the RU considers that a user is using the brute force method to decrypt the password and reports an alarm to the central AP. If the dynamic blacklist function is enabled, the RU adds the user to the dynamic blacklist, discards all the packets of the user until the dynamic blacklist entry ages.

Updated: 2019-01-11

Document ID: EDOC1000176006

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