Method and apparatus for providing adaptive self-synchronized dynamic address translation as an intrusion detection sensor
First Claim
Patent Images
1. A system, comprising:
- a memory configured to store a host table;
a translator configured to restore predetermined portions of packet header information of a data packet, the packet header information including a network portion of a destination address routable over a wide area network and an encrypted host portion of the address identifying a destination host, the restoration including to;
extract, from the packet header information, predetermined portions of packet header data including the encrypted host portion of the address,decrypt the extracted packet header data to determine a restored host portion of the restored address, andplace the restored host portion of the address back into the packet header information of the data packet, preserving the network portion of the destination address of the packet header;
a mapping device configured to map the restored address to the host table;
a host resolution device configured to issue a request to the network to resolve the restored address when the restored address does not match an entry in the host table and to supplement the host table with the restored address upon receipt of a reply to the request that indicates that the restored address is valid; and
an actuator configured to trigger a security device when the restored address does not match an entry in the host table.
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Abstract
A translator is provided for translating predetermined portions of packet header information including an address of a data packet according to a cipher algorithm keyed by a cipher key derived by a key exchanger. A mapping device is also provided for mapping the address to a host table stored in memory. If the address does not match an entry in the host table, a security device is triggered.
24 Citations
12 Claims
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1. A system, comprising:
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a memory configured to store a host table; a translator configured to restore predetermined portions of packet header information of a data packet, the packet header information including a network portion of a destination address routable over a wide area network and an encrypted host portion of the address identifying a destination host, the restoration including to; extract, from the packet header information, predetermined portions of packet header data including the encrypted host portion of the address, decrypt the extracted packet header data to determine a restored host portion of the restored address, and place the restored host portion of the address back into the packet header information of the data packet, preserving the network portion of the destination address of the packet header; a mapping device configured to map the restored address to the host table; a host resolution device configured to issue a request to the network to resolve the restored address when the restored address does not match an entry in the host table and to supplement the host table with the restored address upon receipt of a reply to the request that indicates that the restored address is valid; and an actuator configured to trigger a security device when the restored address does not match an entry in the host table. - View Dependent Claims (2, 3, 4, 5, 11)
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6. A method, comprising:
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restoring predetermined portions of packet header information of a data packet, the packet header information including a network portion of a destination address routable over a wide area network and an encrypted host portion of the address identifying a destination host, the restoring including; extracting, from the packet header information, predetermined portions of packet header data including the encrypted host portion of the address, decrypting the extracted packet header data to determine a restored host portion of the restored address, and placing the host portion of the restored address back into the packet header information of the data packet, preserving the network portion of the destination address of the packet header; issuing a request to the network to resolve the restored address when the restored address does not match an entry in a host table and supplementing the host table with the restored address upon receipt of a reply to the request that indicates that the restored address is valid; and triggering a security device when the restored address does not match an entry in the host table. - View Dependent Claims (7, 8, 9, 10, 12)
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Specification