CA2434992C - Method and apparatus for providing an adaptable security level in an electronic communication - Google Patents
Method and apparatus for providing an adaptable security level in an electronic communication Download PDFInfo
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- CA2434992C CA2434992C CA2434992A CA2434992A CA2434992C CA 2434992 C CA2434992 C CA 2434992C CA 2434992 A CA2434992 A CA 2434992A CA 2434992 A CA2434992 A CA 2434992A CA 2434992 C CA2434992 C CA 2434992C
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- security level
- frame
- security
- computer
- individual frame
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/10—Network architectures or network communication protocols for network security for controlling access to devices or network resources
- H04L63/105—Multiple levels of security
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- Engineering & Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Computer Hardware Design (AREA)
- Computing Systems (AREA)
- General Engineering & Computer Science (AREA)
- Communication Control (AREA)
- Storage Device Security (AREA)
Abstract
A method of communicating in a secure communication system, comprises the steps of assembling as message at a sender, then determining a security level, and including an indication of the security level in a header of the message. The message is then sent to a recipient.
Description
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2 SECURITY LEVEL IN AN ELECTRONIC COMMUNICATION
3
4 BACKGROUND OF THE INVENTION
7 [0001] The present invention relates to a method and apparatus for providing an adaptable 8 security level in an electronic communication.
DESCRIPTION OF THE PRIOR ART
11 [0002] In electronic communications, it is often necessary to prevent an eavesdropper from 12 intercepting message. It is also desirable to have an indication of the authenticity of a message, 13 that is a verifiable identification of the sender. These goals are usually achieved through the use 14 of cryptography. Private key cryptography requires sharing a secret key prior to initating communications. Public key cryptography is generally preferred as it does not require such a 16 shared secret key. Instead, each correspondent has a key pair including a private key and a public 17 key. The public key may be provided by any convenient means, and does not need to be kept 18 secret.
19 [0003] There are many variations in cryptographic algorithms, and various parameters that determine the precise implementation. In standards for wireless communications, it has been 21 customary to set these parameters in advance for each frame type.
However, this approach limits 22 the flexibility of the parameters.
23 [0004] When one device is communicating with several other devices, it will often need to 24 establish separate parameters for each communication.
7 [0001] The present invention relates to a method and apparatus for providing an adaptable 8 security level in an electronic communication.
DESCRIPTION OF THE PRIOR ART
11 [0002] In electronic communications, it is often necessary to prevent an eavesdropper from 12 intercepting message. It is also desirable to have an indication of the authenticity of a message, 13 that is a verifiable identification of the sender. These goals are usually achieved through the use 14 of cryptography. Private key cryptography requires sharing a secret key prior to initating communications. Public key cryptography is generally preferred as it does not require such a 16 shared secret key. Instead, each correspondent has a key pair including a private key and a public 17 key. The public key may be provided by any convenient means, and does not need to be kept 18 secret.
19 [0003] There are many variations in cryptographic algorithms, and various parameters that determine the precise implementation. In standards for wireless communications, it has been 21 customary to set these parameters in advance for each frame type.
However, this approach limits 22 the flexibility of the parameters.
23 [0004] When one device is communicating with several other devices, it will often need to 24 establish separate parameters for each communication.
[0005] It is an object of the present invention to obviate or mitigate the above disadvantages.
28 100061 In accordance with one aspect, there is provided a method performed by a 29 communication device and computer readable storage medium comprising instructions for 1 preparing a plurality of frames, each frame having a header and data; and on a frame-by-2 frame basis, the communication device processing each individual frame by: determining 3 a security level for that individual frame, the security level indicating whether to provide 4 encryption for the individual frame and whether to provide authenticity for the individual frame, thereby allowing different frames to utilize different security levels to adapt to the
28 100061 In accordance with one aspect, there is provided a method performed by a 29 communication device and computer readable storage medium comprising instructions for 1 preparing a plurality of frames, each frame having a header and data; and on a frame-by-2 frame basis, the communication device processing each individual frame by: determining 3 a security level for that individual frame, the security level indicating whether to provide 4 encryption for the individual frame and whether to provide authenticity for the individual frame, thereby allowing different frames to utilize different security levels to adapt to the
6 nature of respective frames on the frame-by-frame basis; and based on the security level,
7 including security level data in the header of that individual frame, the security level data
8 indicating whether encryption is being used for the individual frame and whether
9 authenticity is being used for the individual frame; and the communication device providing the plurality of frames for transmission to a recipient. In accordance with 11 another aspect, there is provided a method performed by a communication device and 12 computer readable storage medium comprising instructions for receiving a plurality of 13 frames, each frame having a header and associated data, the header of each individual 14 frame including security level data that indicate for that individual frame whether encryption has been provided for the individual frame and whether authenticity has been 16 provided for the individual frame, such that different frames can utilize different security 17 levels to adapt to the nature of respective frames on a frame-by-frame basis; for each 18 frame, the communication device: identifying a security level for the frame based on the 19 security level data in the header of the frame; checking the security level against predetermined security requirements for the communication device; and rejecting the 21 frame if the security level does not meet the predetermined security requirements.
22212935.1 lA
[0007] These and other features of the preferred embodiments of the invention will become 6 more apparent in the following detailed description in which reference is made to the appended 7 drawings wherein:
8 [0008] Figure 1 is a schematic representation of a communication system;
9 [0009] Figure 2 is a schematic representation of an information frame exchanged in the communication system of Figure 1;
11 [0010] Figure 3 is a schematic representation of a frame control portion of the frame of 12 Figure 2;
13 [0011] Figure 4 is a schematic representation of a method performed by a sender in Figure 1;
14 [0012] Figure 5 is a schematic representation of a method performed by a recipient in Figure 1.
18 [0013] Referring to Figure 1, a communication system 10 includes a pair of correspondents 19 12, 14 connected by a communication link 16. Each correspondent 12, 14 includes a respective cryptographic unit 18, 20.
21 [0014] Each correspondent 12, 14 can include a processor 22, 24.
Each processor may be 22 coupled to a display and to user input devices, such as a keyboard, mouse, or other suitable 23 devices. If the display is touch sensitive, then the display itself can be employed as the user 24 input device. A computer readable storage medium is coupled to each processor 22, 24 for providing instructions to the processor 22, 24 to instruct and/or configure processor 22, 24 to 26 perform steps or algorithms related to the operation of each correspondent 12, 14, as further 27 explained below. The computer readable medium can include hardware and/or software such as, 28 by way of example only, magnetic disks, magnetic tape, optically readable medium such as CD
29 ROM's, and semi-conductor memory such as PCMCIA cards. In each case, the medium may McCarthy Tetrault LLP TDO-RED #8199673 v. I
1 take the form of a portable item such as a small disk, floppy diskette, cassette, or it may take the 2 form of a relatively large or immobile item such as hard disk drive, solid state memory card, or 3 RAM provided in a support system. It should be noted that the above listed example mediums 4 can be used either alone or in combination.
[0015] Referring to Figure 2, a frame used in communications between the correspondents 6 12, 14 is shown generally by the numeral 30. The frame 30 includes a header 32 and data 34. The 7 header 32 includes information about the source and destination of the frame 30 and is used for 8 processing frames. The header 32 may contain other control information as will be understood 9 by those skilled in the art.
[0016] Referring to Figure 3, the header 32 also contains frame control bits 33. The frame 11 control bits 33 include security bits 35, 36, and 37. Security bit 35 indicates whether encryption 12 is on or off. Security bits 36 and 37 together indicate the integrity level, such as 0, 32, 64, or 128 13 bits. It will be recognized that providing security bits in each frame allows the security level to 14 be modified on a frame-by-frame basis rather than on the basis of a pair of correspondents, therefore providing greater flexibility in organizing communications.
16 [0017] In order to provide security, certain minimum security levels may be used. These 17 levels should be decided upon among all of the correspondents through an agreed-upon rule.
18 This rule may be either static or dynamic.
19 [0018] In operation, the correspondent 12 performs the steps shown in Figure 4 by the numeral 100 to send information to the correspondent 14. First, the correspondent 12 prepares 21 data and a header at step 102. Then it selects the security level at step 104. The security level is 22 determined by considering the minimum security level required by the recipient, the nature of the 23 recipient, and the kind of data being transmitted. If the security level includes encryption, then 24 the correspondent 12 encrypts the data at step 106. If the security level includes authentication, then the correspondent 12 signs the data at step 108. Then the correspondent 12 includes bits 26 indicating the security level in the frame control at step 110. The correspondent 12 then sends the 27 frame to the correspondent 14.
28 [0019] Upon receiving the frame, the correspondent 14 performs the steps shown in Figure 5 29 by the numeral 120. The correspondent 14 first receives the frame at step 122. It then extracts the McCarthy Tetrault LLP TDO-RED #8199673 v 1 1 security bits at step 124. If the security bits indicate encryption, then the correspondent 14 2 decrypts the data at step 126. If the security bits indicate authentication, then the correspondent 3 14 verifies the signature at step 126. Finally, the correspondent 14 checks the security level to 4 ensure it meets predetermined minimum requirements. If either the encryption or authentication fails, or if the security level does not meet the minimum requirements, then the correspondent 14 6 rejects the message.
7 [0020] It will be recognized that providing security bits and an adjustable security level 8 provides flexibility in protecting each frame of the communication. It is therefore possible for the 9 sender to decided which frames should be encrypted but not authenticated.
Since authentication typically increases the length of a message, this provides a savings in constrained environments 11 when bandwidth is at a premium.
12 [0021] In a further embodiment, the correspondent 12 wishes to send the same message to 13 multiple recipients 14 with varying minimum security requirements. In this case, the 14 correspondent 12 chooses a security level high enough to meet all of the requirements. The correspondent 12 then proceeds as in Figure 4 to assemble and send a message with the security 16 level. The message will be accepted by each recipient since it meets each of their minimum 17 requirements. It will be recognized that this embodiment provides greater efficiency than 18 separately dealing with each recipient's requirements.
19 [0022] In another embodiment, a different number of security bits are used. The actual number of bits is not limited to any one value, but rather may be predetermined for any given 21 application. The security bits should indicate the algorithm parameters.
They may be used to 22 determine the length of a key as 40 bits or 128 bits, the version of a key to be used, or any other 23 parameters of the encryption system.
24 [0023] Although the invention has been described with reference to certain specific embodiments, various modifications thereof will be apparent to those skilled in the art without 26 departing from the scope of the claims appended hereto.
22212935.1 lA
[0007] These and other features of the preferred embodiments of the invention will become 6 more apparent in the following detailed description in which reference is made to the appended 7 drawings wherein:
8 [0008] Figure 1 is a schematic representation of a communication system;
9 [0009] Figure 2 is a schematic representation of an information frame exchanged in the communication system of Figure 1;
11 [0010] Figure 3 is a schematic representation of a frame control portion of the frame of 12 Figure 2;
13 [0011] Figure 4 is a schematic representation of a method performed by a sender in Figure 1;
14 [0012] Figure 5 is a schematic representation of a method performed by a recipient in Figure 1.
18 [0013] Referring to Figure 1, a communication system 10 includes a pair of correspondents 19 12, 14 connected by a communication link 16. Each correspondent 12, 14 includes a respective cryptographic unit 18, 20.
21 [0014] Each correspondent 12, 14 can include a processor 22, 24.
Each processor may be 22 coupled to a display and to user input devices, such as a keyboard, mouse, or other suitable 23 devices. If the display is touch sensitive, then the display itself can be employed as the user 24 input device. A computer readable storage medium is coupled to each processor 22, 24 for providing instructions to the processor 22, 24 to instruct and/or configure processor 22, 24 to 26 perform steps or algorithms related to the operation of each correspondent 12, 14, as further 27 explained below. The computer readable medium can include hardware and/or software such as, 28 by way of example only, magnetic disks, magnetic tape, optically readable medium such as CD
29 ROM's, and semi-conductor memory such as PCMCIA cards. In each case, the medium may McCarthy Tetrault LLP TDO-RED #8199673 v. I
1 take the form of a portable item such as a small disk, floppy diskette, cassette, or it may take the 2 form of a relatively large or immobile item such as hard disk drive, solid state memory card, or 3 RAM provided in a support system. It should be noted that the above listed example mediums 4 can be used either alone or in combination.
[0015] Referring to Figure 2, a frame used in communications between the correspondents 6 12, 14 is shown generally by the numeral 30. The frame 30 includes a header 32 and data 34. The 7 header 32 includes information about the source and destination of the frame 30 and is used for 8 processing frames. The header 32 may contain other control information as will be understood 9 by those skilled in the art.
[0016] Referring to Figure 3, the header 32 also contains frame control bits 33. The frame 11 control bits 33 include security bits 35, 36, and 37. Security bit 35 indicates whether encryption 12 is on or off. Security bits 36 and 37 together indicate the integrity level, such as 0, 32, 64, or 128 13 bits. It will be recognized that providing security bits in each frame allows the security level to 14 be modified on a frame-by-frame basis rather than on the basis of a pair of correspondents, therefore providing greater flexibility in organizing communications.
16 [0017] In order to provide security, certain minimum security levels may be used. These 17 levels should be decided upon among all of the correspondents through an agreed-upon rule.
18 This rule may be either static or dynamic.
19 [0018] In operation, the correspondent 12 performs the steps shown in Figure 4 by the numeral 100 to send information to the correspondent 14. First, the correspondent 12 prepares 21 data and a header at step 102. Then it selects the security level at step 104. The security level is 22 determined by considering the minimum security level required by the recipient, the nature of the 23 recipient, and the kind of data being transmitted. If the security level includes encryption, then 24 the correspondent 12 encrypts the data at step 106. If the security level includes authentication, then the correspondent 12 signs the data at step 108. Then the correspondent 12 includes bits 26 indicating the security level in the frame control at step 110. The correspondent 12 then sends the 27 frame to the correspondent 14.
28 [0019] Upon receiving the frame, the correspondent 14 performs the steps shown in Figure 5 29 by the numeral 120. The correspondent 14 first receives the frame at step 122. It then extracts the McCarthy Tetrault LLP TDO-RED #8199673 v 1 1 security bits at step 124. If the security bits indicate encryption, then the correspondent 14 2 decrypts the data at step 126. If the security bits indicate authentication, then the correspondent 3 14 verifies the signature at step 126. Finally, the correspondent 14 checks the security level to 4 ensure it meets predetermined minimum requirements. If either the encryption or authentication fails, or if the security level does not meet the minimum requirements, then the correspondent 14 6 rejects the message.
7 [0020] It will be recognized that providing security bits and an adjustable security level 8 provides flexibility in protecting each frame of the communication. It is therefore possible for the 9 sender to decided which frames should be encrypted but not authenticated.
Since authentication typically increases the length of a message, this provides a savings in constrained environments 11 when bandwidth is at a premium.
12 [0021] In a further embodiment, the correspondent 12 wishes to send the same message to 13 multiple recipients 14 with varying minimum security requirements. In this case, the 14 correspondent 12 chooses a security level high enough to meet all of the requirements. The correspondent 12 then proceeds as in Figure 4 to assemble and send a message with the security 16 level. The message will be accepted by each recipient since it meets each of their minimum 17 requirements. It will be recognized that this embodiment provides greater efficiency than 18 separately dealing with each recipient's requirements.
19 [0022] In another embodiment, a different number of security bits are used. The actual number of bits is not limited to any one value, but rather may be predetermined for any given 21 application. The security bits should indicate the algorithm parameters.
They may be used to 22 determine the length of a key as 40 bits or 128 bits, the version of a key to be used, or any other 23 parameters of the encryption system.
24 [0023] Although the invention has been described with reference to certain specific embodiments, various modifications thereof will be apparent to those skilled in the art without 26 departing from the scope of the claims appended hereto.
Claims (40)
1. A method performed by a communication device, said method comprising:
said communication device preparing a plurality of frames, each frame having a header and data; and on a frame-by-frame basis, said communication device processing each individual frame by:
determining a security level for said individual frame, the security level indicating whether to provide encryption for said individual frame and whether to provide authenticity for said individual frame, thereby allowing different frames to utilize different security levels on said frame-by-frame basis; and based on said security level, including security level data in the header of said individual frame, said security level data indicating whether encryption is being used for said individual frame and whether authenticity is being used for said individual frame;
and said communication device providing the plurality of frames for transmission to a recipient.
said communication device preparing a plurality of frames, each frame having a header and data; and on a frame-by-frame basis, said communication device processing each individual frame by:
determining a security level for said individual frame, the security level indicating whether to provide encryption for said individual frame and whether to provide authenticity for said individual frame, thereby allowing different frames to utilize different security levels on said frame-by-frame basis; and based on said security level, including security level data in the header of said individual frame, said security level data indicating whether encryption is being used for said individual frame and whether authenticity is being used for said individual frame;
and said communication device providing the plurality of frames for transmission to a recipient.
2. The method according to claim 1, wherein said security level data include one or more security mode bits indicating a security mode.
3. The method according to claim 1 or claim 2, wherein said security level data include an indication of a parameter associated with a key to be used.
4. The method according to any one of claims 1 to 3, wherein said communication device provides the plurality of frames for transmission to multiple recipients, and determining said security level includes determining a minimum security level to satisfy all of the recipients, wherein said security level data are based on said minimum security level.
5. The method according to any one of claims 1 to 3, wherein said security level data enable a recipient device to identify said security level for said individual frame and to reject said individual frame if said security level does not comply with a minimum security level required by the recipient device.
6. The method according to any one of claims 1 to 5, wherein said security level is determined based on predetermined minimum requirements.
7. The method according to claim 6, wherein said predetermined minimum requirements are determined among said communication device and at least one recipient device based on an agreed-upon rule.
8. The method according to any one of claims 1 to 7, wherein said security level is determined based upon content of said individual frame.
9. The method according to any one of claims 1 to 8, further comprising said communication device encrypting the data for said individual frame according to said security level for the frame.
10. The method according to any one of claims 1 to 9, wherein said security level data include one or more integrity bits indicating an integrity level.
11. The method according to any one of claims 1 to 10, wherein said security level data include an indication of a cryptographic algorithm parameter.
12. The method according to any one of claims 1 to 11, further comprising the communication device signing the header and data for said individual frame according to said security level for said individual frame.
13. A computer-readable storage medium comprising computer-executable instructions that are operable when executed by data processing apparatus to perform operations comprising:
preparing a plurality of frames, each frame having a header and data;
on a frame-by-frame basis processing each individual frame by:
determining a security level for said individual frame, the security level indicating whether to provide encryption for said individual frame and whether to provide authenticity for said individual frame, thereby allowing different frames to utilize different security levels on said frame-by-frame basis; and based on said security level, including security level data in the header of said individual frame, said security level data indicating whether encryption is being used for said individual frame and whether authenticity is being used for said individual frame;
and providing the plurality of frames for transmission to a recipient.
preparing a plurality of frames, each frame having a header and data;
on a frame-by-frame basis processing each individual frame by:
determining a security level for said individual frame, the security level indicating whether to provide encryption for said individual frame and whether to provide authenticity for said individual frame, thereby allowing different frames to utilize different security levels on said frame-by-frame basis; and based on said security level, including security level data in the header of said individual frame, said security level data indicating whether encryption is being used for said individual frame and whether authenticity is being used for said individual frame;
and providing the plurality of frames for transmission to a recipient.
14. The computer-readable storage medium according to claim 13, wherein said security level data include one or more security mode bits indicating a security mode.
15. The computer-readable storage medium according to claim 13 or claim 14, wherein said security level data include an indication of a parameter associated with a key to be used.
16. The computer-readable storage medium according to any one of claims 13 to 15, wherein said plurality of frames are provided for transmission to multiple recipients, determining said security level includes determining a minimum security level to satisfy all of the recipients, and said security level data are based on said minimum security level.
17. The computer-readable storage medium according to any one of claims 13 to 16, wherein said security level is determined based on predetermined minimum requirements.
18. The computer-readable storage medium according to claim 17, wherein said predetermined minimum requirements arc determined based on an agreed-upon rule.
19. The computer-readable storage medium according to any one of claims 13 to 18, wherein said security level is determined based upon content of said individual frame.
20. The computer-readable storage medium according to any one of claims 13 to 19, the operations further comprising encrypting the data for said individual frame according to said security level for said individual frame.
21. The computer-readable storage medium according to any one of claims 13 to 20, wherein said security level data include one or more integrity bits indicating an integrity level.
22. The computer-readable storage medium according to any one of claims 13 to 21, wherein said security level data include an indication of a cryptographic algorithm parameter.
23. The computer-readable storage medium according to any one of claims 13 to 22, the operations further comprising signing the header and data for each individual frame according to said security level for the frame.
24. A method performed by a communication device, the method comprising:
said communication device receiving a plurality of frames, each frame having a header and associated data, the header of each individual frame including security level data that indicate for that individual frame whether encryption has been provided for the individual frame and whether authenticity has been provided for the individual frame, such that different frames can utilize different security levels on a frame-by-frame basis;
for each frame, said communication device:
identifying a security level for the frame based on the security level data in the header of the frame;
checking said security level against predetermined security requirements for said communication device; and rejecting the frame if said security level does not meet said predetermined security requirements.
said communication device receiving a plurality of frames, each frame having a header and associated data, the header of each individual frame including security level data that indicate for that individual frame whether encryption has been provided for the individual frame and whether authenticity has been provided for the individual frame, such that different frames can utilize different security levels on a frame-by-frame basis;
for each frame, said communication device:
identifying a security level for the frame based on the security level data in the header of the frame;
checking said security level against predetermined security requirements for said communication device; and rejecting the frame if said security level does not meet said predetermined security requirements.
25. The method according to claim 24, wherein said security level data include one or more security mode bits indicating a security mode.
26. The method according to claim 24 or claim 25, wherein said security level data include an indication of a parameter associated with a key to be used.
27. The method according to any one of claims 24 to 26, wherein said security level is selected by another device based on said predetermined security requirements for said communication device.
28. The method according to claim 27, wherein said predetermined security requirements are determined among said communication device and said other device based on an agreed-upon rule.
29. The method according to any one of claims 24 to 28, wherein said security level data include one or more integrity bits indicating an integrity level.
30. The method according to any one of claims 24 to 29, wherein said security level data include an indication of a cryptographic algorithm parameter.
31. The method according to any one of claims 24 to 30, further comprising decrypting the frame according to said security level for the frame.
32. The method according to any one of claims 24 to 31, further comprising verifying the authenticity of the frame according to said security level for the frame.
33. A computer-readable storage medium comprising computer-executable instructions that are operable when executed, by data processing apparatus of a communication device, to perform operations comprising:
receiving a plurality of frames, each individual frame having a header and data, the header of the individual frame including security level data that indicate for the individual frame whether encryption has been provided for the individual frame and whether authenticity has been provided for the individual frame, such that different frames can utilize different security levels on a frame-by-frame basis;
for each of the plurality of frames:
identifying a security level for the frame based on the security level data in the header of the frame;
checking said security level against predetermined security requirements for said communication device; and rejecting the frame if said security level does not meet said predetermined security requirements.
receiving a plurality of frames, each individual frame having a header and data, the header of the individual frame including security level data that indicate for the individual frame whether encryption has been provided for the individual frame and whether authenticity has been provided for the individual frame, such that different frames can utilize different security levels on a frame-by-frame basis;
for each of the plurality of frames:
identifying a security level for the frame based on the security level data in the header of the frame;
checking said security level against predetermined security requirements for said communication device; and rejecting the frame if said security level does not meet said predetermined security requirements.
34. The computer-readable storage medium according to claim 33, wherein said security level data include one or more security mode bits indicating a security mode.
35. The computer-readable storage medium according to claim 33 or claim 34, wherein said security level is selected by another device based on said predetermined security requirements for said communication device.
36. The computer-readable storage medium according to any one of claims 33 to 35, wherein said predetermined security requirements are determined among the communication device and the other device based on an agreed-upon rule.
37. The computer-readable storage medium according to any one of claims 33 to 36, wherein said security level data include one or more integrity bits indicating an integrity level.
38. The computer-readable storage medium according to any one of claims 33 to 37, wherein said security level data include an indication of a cryptographic algorithm parameter.
39. The computer-readable storage medium according to any one of claims 33 to 38, the operations further comprising decrypting each frame according to said security level for the frame.
40. The computer-readable storage medium according to any one of claims 33 to 39, the operations further comprising verifying the authenticity of the frame according to said security level for the frame.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2434992A CA2434992C (en) | 2003-07-07 | 2003-07-07 | Method and apparatus for providing an adaptable security level in an electronic communication |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2434992A CA2434992C (en) | 2003-07-07 | 2003-07-07 | Method and apparatus for providing an adaptable security level in an electronic communication |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2434992A1 CA2434992A1 (en) | 2005-01-07 |
| CA2434992C true CA2434992C (en) | 2014-08-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2434992A Expired - Lifetime CA2434992C (en) | 2003-07-07 | 2003-07-07 | Method and apparatus for providing an adaptable security level in an electronic communication |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2434992C (en) |
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- 2003-07-07 CA CA2434992A patent/CA2434992C/en not_active Expired - Lifetime
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| Publication number | Publication date |
|---|---|
| CA2434992A1 (en) | 2005-01-07 |
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