Patent Grant
10419345
This disclosure is generally related to distribution of digital content. More specifically, this disclosure is related to a system and method for secure and efficient transportation of content in a content centric network based on a fragmentation protocol.
The proliferation of the Internet and e-commerce continues to create a vast amount of digital content. Content centric network (CCN) architectures have been designed to facilitate accessing and processing such digital content. A CCN includes entities, or nodes, such as network clients, forwarders (e.g., routers), and content producers, which communicate with each other by sending interest packets for various content items and receiving content object packets in return. CCN interests and content objects are identified by their unique names, which are typically hierarchically structured variable length identifiers (HSVLI). An HSVLI can include contiguous name components ordered from a most general level to a most specific level. Generally, interests and content objects travel through a number of links before they can reach their destination. Each link can have its own maximum transmission unit (MTU), where the differing MTU limits impose different fragmentation requirements. End-to-end CCN fragmentation is described in U.S. patent application Ser. Nos. 14/065,691 and 14/067,587, and cut-through forwarding of CCN message fragments with IP encapsulation is described in U.S. patent application Ser. No. 14/309,681.
Fragmentation protocols related to CCN continue to evolve. One secure fragmentation protocol for CCN is known as Fragmentation with Integrity Guarantees and Optional Authentication (FIGOA), described in Ghali et al., “Secure Fragmentation for Content-Centric Networks,” Computing Research Repository, 1405.2861 (2014), which disclosure is herein incorporated by reference in its entirety. The FIGOA protocol operates by creating fragments that are chained via hash computation, transmitting fragments with a name that match an interest for the name, and including a signature in the final fragment. However, under the FIGOA protocol, a content producer signs the final fragment, which creates a delayed verification of the signature by a requesting entity until all fragments have been received. This delayed verification may decrease the overall throughput of data and may also result in the injection of malicious packets, which can create inefficiencies and introduce security issues in the network. In addition, the FIGOA protocol does not provide a method to selectively request re-transmission of a specific fragment. When a fragment is dropped, the requesting entity re-requests the entire data stream, resulting in further inefficiencies in the network.
One embodiment provides a system that facilitates efficient and secure transportation of content over a network. During operation, the system receives, by an intermediate node, a packet that corresponds to a fragment of a content object message that is fragmented into a plurality of fragments. One or more fragments of the plurality of fragments indicate a unique name. The received fragment indicates an intermediate state which is based on a hash function performed on an intermediate state from a previous fragment and data included in the received fragment. In response to determining that the received fragment is a first fragment, the system identifies a first entry in a pending interest table for an interest with a name that is based on a hash of a content object and that corresponds to the first fragment, and creates a second entry in the pending interest table based on a digest or a segment identifier for the content object message.
In the figures, like reference numerals refer to the same figure elements.
The following description is presented to enable any person skilled in the art to make and use the embodiments, and is provided in the context of a particular application and its requirements. Various modifications to the disclosed embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other embodiments and applications without departing from the spirit and scope of the present disclosure. Thus, the present invention is not limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.
Overview
Embodiments of the present invention provide a system which facilitates transportation of content over a content centric network based on a fragmentation protocol which uses efficient signature verification and allows for selective retransmission of individual fragments. One fragmentation scheme for transporting CCN content is known as Fragmentation with Integrity Guarantees and Optional Authentication (FIGOA). Under the FIGOA scheme, a content producer can fragment a content object and chain the fragments with a hash chain, where each fragment contains an intermediate state that is calculated based on the intermediate state from the previous fragment and the data from the respective fragment. Each fragment in FIGOA includes the full name of the content object message, while the signature of the producer is included only in the final fragment. The signature verification relies on the final state of the hash chain, which can only be computed when the final fragment is received. In addition, because the same name is included in each fragment, FIGOA does not provide a way to perform retransmission requests for a specific fragment or group of fragments.
Embodiments of the present invention address these inefficiencies by providing a fragmentation protocol also known as the Network Named Fragments (NNF) protocol that allows for more efficient signature verification and directly addressing individual CCN content object fragments. In the NNF protocol, the signature of the content producer is included in the first fragment, which makes the signature immediately verifiable. Subsequent fragments each contain an intermediate state which is based on a hash of the data of the respective fragment and the intermediate state from the previous fragment. Thus, the signature on the first fragment creates the root of a trusted hash chain for the remainder of the fragments.
In addition, the NNF protocol uniquely identifies each fragment based on certain state characteristics, such as overall digest, payload offset, and intermediate state (as described below in relation to
The overall length of the fragmented content is not limited to a specific length, which allows for the transmission of large payloads. Content sent based on the NNF protocol can be very long content with a known digest (e.g., a video file), or can be segments where the digest is not known until the end of the segment (e.g., a live video stream). In the case of a segmented stream, a content producer sending data based on the NNF protocol can generate and include a same segment identifier in each segment. The producer signs the final fragment only after the overall digest is known (e.g., has been calculated based on the intermediate state of the previous hash chain), thus binding the segment identifier to the overall digest.
The following terms describe elements of a CCN architecture:
Content Object or “content object”: A single piece of named data, which is bound to a unique name. Content Objects are “persistent,” which means that a Content Object can move around within a computing device, or across different computing devices, but does not change. If any component of the Content Object changes, the entity that made the change creates a new Content Object that includes the updated content, and binds the new Content Object to a new unique name.
Unique Names: A name in a CCN is typically location independent and uniquely identifies a Content Object. A data-forwarding device can use the name or name prefix to forward a packet toward a network node that generates or stores the Content Object, regardless of a network address or physical location for the Content Object. In some embodiments, the name may be a hierarchically structured variable-length identifier (HSVLI). The HSVLI can be divided into several hierarchical components, which can be structured in various ways. For example, the individual name components parc, home, ccn, and test.txt can be structured in a left-oriented prefix-major fashion to form the name “/parc/home/ccn/test.txt.” Thus, the name “/parc/home/ccn” can be a “parent” or “prefix” of “/parc/home/ccn/test.txt.” Additional components can be used to distinguish between different versions of the content item, such as a collaborative document.
In some embodiments, the name can include a non-hierarchical identifier, such as a hash value that is derived from the Content Object's data (e.g., a checksum value) and/or from elements of the Content Object's name. A description of a hash-based name is described in U.S. patent application Ser. No. 13/847,814 (entitled “ORDERED-ELEMENT NAMING FOR NAME-BASED PACKET FORWARDING,” by inventor Ignacio Solis, filed 20 Mar. 2013), which is hereby incorporated by reference. A name can also be a flat label. Hereinafter, “name” is used to refer to any name for a piece of data in a name-data network, such as a hierarchical name or name prefix, a flat name, a fixed-length name, an arbitrary-length name, or a label (e.g., a Multiprotocol Label Switching (MPLS) label).
Interest or “interest”: A packet that indicates a request for a piece of data, and includes a name (or a name prefix) for the piece of data. A data consumer can disseminate a request or Interest across an information-centric network, which CCN routers can propagate toward a storage device (e.g., a cache server) or a data producer that can provide the requested data to satisfy the request or Interest.
The methods disclosed herein are not limited to CCN networks and are applicable to other architectures as well. A description of a CCN architecture is described in U.S. patent application Ser. No. 12/338,175 (entitled “CONTROLLING THE SPREAD OF INTERESTS AND CONTENT IN A CONTENT CENTRIC NETWORK,” by inventors Van L. Jacobson and Diana K. Smetters, filed 18 Dec. 2008), which is hereby incorporated by reference.
Exemplary Network and Communication
A requesting entity (such as device 116) can generate an interest in a piece of content and send it to node 102. Intermediate nodes (such as CCN routers 102, 104, 112, and 114) can receive and forward the interest. A content producer (such as device or content producer 118) can satisfy the requested interest. Producer 118 can fragment a responsive content object 130 into x number of fragments, e.g., fragments 130.1-130.x. Producer 118 can sign the first fragment (as described below in relation to
It is important to note the benefit for the consumer of signing the first fragment, when the overall digest and overall length are known ahead of time. If the last fragment is signed, instead, then a consumer must buffer all the prior fragments and wait for all the content to be received and the signature verified before using the data. Firewall systems checking signatures must likewise either buffer all fragments or pass them and only drop the last fragment if it fails verification. Because the first fragment is signed, the consumer can begin signature verification in parallel with receiving later fragments, as opposed to the last fragment begin signed where the signature verification time cannot be amortized over network time. One example can be seen in Guneysu et al., “Software Speed Records for Lattice-Based Signatures,” Post-Quantum Cryptography, Volume 7932:67-82, Lecture Notes in Computer Science (“Guneysu”). Guneysu finds that RSA 2048-bit signature verification takes 77,032 CPU cycles, elliptical curve takes 209,328 CPU cycles, and an optimized lattice signature verification takes 45,036 CPU cycles. Assuming a 3 GHz CPU, these times are 25.6 usec, 69.8 usec, and 15.0 usec, respectively. On a 10 Gbps link, a 1500 byte packet takes approximately 1.2 usec, so these delays are between 12.5 to 58 packet times.
Exemplary Format of CCN Content Object Message Fragments
Overall digests 212 and 222 can be included in first fragment 210 and subsequent fragment 220, respectively, when the hash chain and the final overall digest is known in advance, e.g., when fragmenting a known file. The NNF protocol provides a slightly different format for the case of an unterminated data stream transmitted in segments of known length with a deferred digest computation, e.g., a live stream.
Selective Retransmission of a Fragment or Fragments
Because the NNF protocol uniquely identifies each fragment based on, e.g., {Name, OverallDigest, PayloadOffset, IntermediateState}, certain of these characteristics can be encoded into the name to uniquely address a fragment for selective retransmission. For example, Overall Digest (“OD”), Payload Offset (“PO”), and IntermediateState (“IS”) can be encoded in the name for a fragment:
/parc.com/movie.alto.mkv/OD=123abc/P0=4096/IS=653efa (1)
By using this naming convention, a requesting entity or intermediate node can selectively request a specific fragment.
It is not required to name every fragment. A producer may, for example, name every 3rd fragment. If the MTU is 1500 bytes, then the retransmission window in this case would be 4500 bytes. When a consumer loses one or more fragments in such a block, it only needs to send an interest for the closest prior named fragment and it will receive a retransmission of all fragments in that named block.
Note that the first fragment has two names. There is the general name, e.g. “/parc/com/movie.alto.mkv”, which retrieves all fragments, and there is the fragment name, e.g. “/parc/com/movie.alto.mkv/OD=123abc/P0=0/IS=6a09e667 . . . ” where the IS in this case is the SHA-256 Initialization Vector. The fragment name would only retrieve the first fragment or first fragment block, not the entire set of fragments like the general name.
Similar to Name (1) above, a producer can name fragments of a segment with a Segment ID instead of an OverallDigest:
/parc/com/movie.alto.mkv/SID=444ddd/P0=4096/IS=135ace (2)
An interest with a name similar to Name (2) enables retransmission of individual segment fragments or segment fragment blocks if not all fragments carry a name.
In addition, a requesting entity can selectively request a subset or chain of fragments by including the name and an additional payload size. For example, consider an interest with the following name:
/parc.com/movie.alto.mkv/OD=123abc/P0=4096/IS=653efa/PS=8192 (3)
If the size of each individual fragment is 1024B, an interest with Name (3) returns a chain of four fragments starting at byte offset 4096. Re-fragmentation can also occur. For example, consider an interest with the following name:
/parc.com/movie.alto.mkv/OD=123abc/P0=4096/IS=653efa/PS=7680 (4)
Similar to an interest with Name (3), an interest with name (4) returns a chain of four fragments. However, the fourth fragment of the chain is re-fragmented to 512B.
Fragmenting a Content Object of a Known Length
Fragmenting a Content Object of an Unknown Length
The content producer then determines whether the subsequent fragment is the final fragment (decision 558). If it is not, then the content producer repeats operations 552, 554, and 556 for the next subsequent fragment. If it is the final fragment, then the content producer calculates the overall digest for the content object message based on the intermediate state for the final fragment (operation 560), and includes the overall digest in the final fragment (operation 562). The content producer signs the final fragment by including a digital signature for the content producer in the final fragment, where the digital signature creates a relationship or a binding between the segment identifier and the overall digest (operation 564). The final fragment can be a tail object that contains no payload and can be transmitted after the processing delay of calculating the overall digest. Because the tail object is signed, the size of the tail object remains small to avoid re-fragmentation by an intermediate node.
The content producer then forwards the final fragment by sending it to the next-hop CCN node based on the reverse path of the interest message (operation 566). Note that while operation 512 is depicted as occurring before operations 556 and 566, the first fragment may not arrive before the other fragments (e.g., the subsequent and final fragments). A requesting entity such as a content consumer processes the first fragment as the root of the hash chain before trusting, processing, and reassembling the remaining fragments.
Processing a Fragment of a Content Object of a Known Length
The intermediate node determines if the received fragment is the first fragment (decision 608). If the received fragment is the first fragment, the intermediate node identifies a corresponding entry in the PIT (“first entry”) based on the name or the content object hash for the first fragment (operation 610). The first fragment can be a signed content object that includes the name, the KeyId, the content object hash, the overall length, and the overall digest. The intermediate node creates a new entry in the PIT (“second entry”) based on the overall digest included in the first fragment, and removes the first entry from the PIT (operation 612). The second PIT entry can also include the overall length. Because the signature is included in the first fragment, the intermediate node can optionally perform a signature verification procedure (operation 614). The intermediate node can also verify the content by computing the hash of the initialization vector and the data from the first fragment, and comparing the result with the intermediate state included in the first fragment (not shown in
If the received fragment is not the first fragment, the intermediate node identifies the corresponding entry in the PIT (e.g., the second entry) based on the name or the overall digest (operation 616). The intermediate node can verify the content by computing the hash of the intermediate state from the previous fragment and the data from the received fragment, and comparing the result with the intermediate state included in the received fragment (operation 618). The operation then continues as described by Label C in
Exemplary Algorithms for Processing a Fragment of a Content Object
Processing a Fragment of a Content Object of an Unknown Length
Exemplary Apparatus and Computer System
In some embodiments, communication module 802 can send and/or receive data packets to/from other network nodes across a computer network, such as a content centric network, where a data packet can correspond to a fragment of a content object message that is fragmented into a plurality of fragments. In response to determining that the received fragment is a first fragment, PIT maintenance module 804 can: identify a first entry in a PIT for an interest with a name that is based on a hash of a content object and that corresponds to the first fragment; create a second entry in the PIT based on a digest or a segment identifier for the content object message; and remove the first entry from the PIT. In response to determining that the received fragment is a subsequent fragment, PIT maintenance module 804 can identify an entry in the pending interest table for an interest with a digest or a segment identifier that corresponds to the subsequent fragment. In response to determining that the received fragment corresponds to an entry in the pending interest table, PIT maintenance module 804 can update the total number of bytes forwarded based on a length and a position for the received fragment. In response to determining that the total length of bytes forwarded is equal to the overall length, PIT maintenance module 804 can also remove the corresponding entry from the PIT.
Content-fragmenting module 806 can generate, by a content producing device, a content object message that is responsive to an interest message, and can fragment the content object message into a plurality of fragments. Content-fragmenting module 806 can also include in the first fragment no payload or a payload with a size smaller than a predetermined threshold that does not require re-fragmentation. State-calculating module 808 can compute an intermediate state for a first fragment based on a hash function performed on an initialization vector for the content object message. State-calculating module 808 can also compute an intermediate state for a subsequent fragment based on a hash function performed on an intermediate state from a previous fragment and a payload for the subsequent fragment.
Security module 810 can include in the first fragment a digital signature of the content producing device. Content-fragmenting module 806 can generate a segment identifier for the content object message, and can include the segment identifier in each fragment of the plurality of fragments. In response to determining that the content object message is completely generated, content-fragmenting module 806 can generate a final fragment. State-calculating module 808 can compute a digest for the complete content object message based on a hash function performed on the intermediate state from a previous fragment and a payload for the final fragment. Security module 810 can include in the final fragment a digital signature of the content producing device.
Content-processing system 918 can include instructions, which when executed by computer system 902, can cause computer system 902 to perform methods and/or processes described in this disclosure. Specifically, content-processing system 918 may include instructions for sending and/or receiving data packets to/from other network nodes across a computer network, such as a content centric network (communication module 920). For example, content-processing system 918 can include instructions for receiving, by an intermediate node, a data packet that corresponds to a fragment of a content object message that is fragmented into a plurality of fragments (communication module 920).
Content-processing system 918 can include instructions for, in response to determining that the received fragment is a first fragment, identifying a first entry in a PIT for an interest with a name that is based on a hash of a content object and that corresponds to the first fragment (PIT maintenance module 922). Content-processing system 918 can also include instructions for creating a second entry in the PIT based on a digest or a segment identifier for the content object message, and removing the first entry from the PIT (PIT maintenance module 922). Content-processing system 918 can include instructions for, in response to determining that the received fragment is a subsequent fragment, identifying an entry in the pending interest table for an interest with a digest or a segment identifier that corresponds to the subsequent fragment (PIT maintenance module 922). Content-processing system 918 can also include instructions for, in response to determining that the received fragment corresponds to an entry in the pending interest table, updating the total number of bytes forwarded based on a length and a position for the received fragment. Content-processing system 918 can additionally include instructions for, in response to determining that the total length of bytes forwarded is equal to the overall length, removing the corresponding entry from the PIT (PIT maintenance module 922).
Content-processing system 918 can include instructions for generating a content object message that is responsive to an interest message, and can fragment the content object message into a plurality of fragments (content-fragmenting module 924). Content-processing system 918 can include instructions for including in the first fragment no payload or a payload with a size smaller than a predetermined threshold that does not require re-fragmentation (content-fragmenting module 924).
Content-processing system 918 can include instructions for computing an intermediate state for a first fragment based on a hash function performed on an initialization vector for the content object message, and for computing an intermediate state for a subsequent fragment based on a hash function performed on an intermediate state from a previous fragment and a payload for the subsequent fragment (state-calculating module 926).
Content-processing system 918 can also include instructions for including in the first fragment a digital signature of the content producing device (security module 928). Content-processing system 918 can include instructions for generating a segment identifier for the content object message, and for including the segment identifier in each fragment of the plurality of fragments (content-fragmenting module 924). Content-processing system 918 can include instructions for, in response to determining that the content object message is completely generated, generating a final fragment (content-fragmenting module 924). Content-processing system 918 can include instructions for computing a digest for the complete content object message based on a hash function performed on the intermediate state from a previous fragment and a payload for the final fragment (state-calculating module 926), and for including in the final fragment a digital signature of the content producing device (security module 928).
Data 930 can include any data that is required as input or that is generated as output by the methods and/or processes described in this disclosure. Specifically, data 930 can store at least: a packet that corresponds to a fragment of a content object message that is fragmented into a plurality of fragments; a unique name that is an HSVLI that comprises contiguous name components ordered from a most general level to a most specific level; a name that is based on a hash of a content object or that indicates a digest; an intermediate state for a fragment which is based on a hash function performed on an intermediate state from a previous fragment and data included in the fragment; a pending interest table; a digest for a content object; a segment identifier; a byte offset that corresponds to a starting byte for a fragment; an overall length for a content object; a payload size; an entry in a pending interest table; a digital signature of a content producing device; a total number of bytes forwarded; and a name that indicates the intermediate state, the byte offset, and the digest.
The data structures and code described in this detailed description are typically stored on a computer-readable storage medium, which may be any device or medium that can store code and/or data for use by a computer system. The computer-readable storage medium includes, but is not limited to, volatile memory, non-volatile memory, magnetic and optical storage devices such as disk drives, magnetic tape, CDs (compact discs), DVDs (digital versatile discs or digital video discs), or other media capable of storing computer-readable media now known or later developed.
The methods and processes described in the detailed description section can be embodied as code and/or data, which can be stored in a computer-readable storage medium as described above. When a computer system reads and executes the code and/or data stored on the computer-readable storage medium, the computer system performs the methods and processes embodied as data structures and code and stored within the computer-readable storage medium.
Furthermore, the methods and processes described above can be included in hardware modules. For example, the hardware modules can include, but are not limited to, application-specific integrated circuit (ASIC) chips, field-programmable gate arrays (FPGAs), and other programmable-logic devices now known or later developed. When the hardware modules are activated, the hardware modules perform the methods and processes included within the hardware modules.
In summary, in one aspect, a system is provided, comprising: a processor; and a storage device storing instructions that, when executed by the processor, cause the processor to perform a method, the method comprising: receiving, by an intermediate node, a packet that corresponds to a fragment of a content object message that is fragmented into a plurality of fragments, wherein one or more fragments of the plurality of fragments indicate a unique name, wherein the received fragment indicates an intermediate state which is based on a hash function performed on an intermediate state form a previous fragment and data included in the received fragment; and in response to determining that the received fragment is a first fragment: identifying a first entry in a pending interest table for an interest with a name that is based on a hash of a content object and that corresponds to the first fragment; and creating a second entry in the pending interest table based on a digest or a segment identifier for the content object message.
In another aspect, a computer-implemented method for forwarding packets is provided, comprising: receiving, by an intermediate node, a packet that corresponds to a fragment of a content object message that is fragmented into a plurality of fragments, wherein one or more fragments of the plurality of fragments indicates a unique name, wherein the received fragment indicates an intermediate state which is based on a hash function performed on an intermediate state from a previous fragment and data included in the received fragment; and in response to determining that the received fragment is a first fragment: identifying a first entry in a pending interest table for an interest with a name that is based on a hash of a content object and that corresponds to the first fragment; and creating a second entry in the pending interest table based on a digest or a segment identifier for the content object message.
In yet another aspect, non-transitory computer readable media encoded with instructions are provided. The instructions, when executed by a processor, cause the processor to perform a method of: receiving, by an intermediate node, a packet that corresponds to a fragment of a content object message that is fragmented into a plurality of fragments, wherein one or more fragments of the plurality of fragments indicate a unique name, wherein the received fragment indicates an intermediate state which is based on a hash function performed on an intermediate state form a previous fragment and data included in the received fragment; and in response to determining that the received fragment is a first fragment: identifying a first entry in a pending interest table for an interest with a name that is based on a hash of a content object and that corresponds to the first fragment; and creating a second entry in the pending interest table based on a digest or a segment identifier for the content object message.
The foregoing descriptions of embodiments of the present invention have been presented for purposes of illustration and description only. They are not intended to be exhaustive or to limit the present invention to the forms disclosed. Accordingly, many modifications and variations will be apparent to practitioners skilled in the art. Additionally, the above disclosure is not intended to limit the present invention. The scope of the present invention is defined by the appended claims.
This application is a continuation of U.S. application Ser. No. 14/851,894, filed Sep. 11, 2015, the entirety of which is incorporated herein by reference.
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| Number | Date | Country | |
|---|---|---|---|
| 20180048570 A1 | Feb 2018 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 14851894 | Sep 2015 | US |
| Child | 15790893 | US |
