Cryptographic method using dual encryption keys and a wireless local area network (LAN) system therefor
First Claim
1. A cryptographic method using dual keys in a wireless local area network (LAN) system, comprising:
- (a) generating a first group key in N wireless terminals forming an ad-hoc group, where N is equal to or greater than two;
(b) generating an initial second group key in a main wireless terminal to perform a key distribution center function among the N wireless terminals in response to a request from one of(N−
1) sub wireless terminals, the request being communicated using the first group key, and transmitting the initial second group key to (N−
1) sub wireless terminals;
(c) encoding data using the initial second group key, and transmitting the encoded data between the N wireless terminals;
(d) modifying the initial second group key in the main wireless terminal according to a modification time period to form at least one modified second group key, the modification time period being predetermined in the main wireless terminal; and
(e) transmitting the at least one modified second group key to the (N−
1) sub wireless terminals, wherein the at least one modified second group key is transmitted and used to encode data between the N wireless terminals during use of the first group key, wherein in (e), the at least one modified second group key is encoded using the initial second group key, the method further comprising transmitting the encoded modified second group key to the (N−
1) sub wireless terminals,wherein in (b), the main wireless terminal encodes the initial second group key using the first group key, and transmits the encoded initial second group key to the (N−
1) wireless terminals.
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Abstract
A cryptographic method using dual encryption keys and a wireless local area network (LAN) system therefor includes (a) generating a first group key in N wireless terminals forming an ad-hoc group, where N is equal to or greater than two, (b) generating a second group key in a main wireless terminal to perform a key distribution center function among the N wireless terminals, and transmitting the second group key to (N−1) sub wireless terminal, and (c) encoding data using the second group key, and transmitting the encoded data between the N wireless terminals. Data security in a wireless LAN system of an ad-hoc network is increased by creating a first group key having a low frequency of use using a group password, and using a random key generation algorithm to create, distribute, and modify a second group key in a wireless terminal functioning as a key distribution center.
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Citations
20 Claims
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1. A cryptographic method using dual keys in a wireless local area network (LAN) system, comprising:
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(a) generating a first group key in N wireless terminals forming an ad-hoc group, where N is equal to or greater than two; (b) generating an initial second group key in a main wireless terminal to perform a key distribution center function among the N wireless terminals in response to a request from one of(N−
1) sub wireless terminals, the request being communicated using the first group key, and transmitting the initial second group key to (N−
1) sub wireless terminals;(c) encoding data using the initial second group key, and transmitting the encoded data between the N wireless terminals; (d) modifying the initial second group key in the main wireless terminal according to a modification time period to form at least one modified second group key, the modification time period being predetermined in the main wireless terminal; and (e) transmitting the at least one modified second group key to the (N−
1) sub wireless terminals, wherein the at least one modified second group key is transmitted and used to encode data between the N wireless terminals during use of the first group key, wherein in (e), the at least one modified second group key is encoded using the initial second group key, the method further comprising transmitting the encoded modified second group key to the (N−
1) sub wireless terminals,wherein in (b), the main wireless terminal encodes the initial second group key using the first group key, and transmits the encoded initial second group key to the (N−
1) wireless terminals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A wireless local area network (LAN) system, comprising:
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N, where N is equal to or greater than two, wireless terminals which form an ad-hoc group, and create first and second group keys, wherein the N wireless terminals include; a main wireless terminal for performing a key distribution center function in the ad-hoc group, for creating an initial second group key in response to a request from one of(N−
1) sub wireless terminals, the request being communicated using the first group key, and encoding data using the initial second group key, and for transmitting the encoded data between the remaining wireless terminals; and(N−
1) sub wireless terminals for generating a first group key and for receiving the initial second group key from the main wireless terminal and encoding data using the initial second group key, and for transmitting the encoded data between the remaining wireless terminals,wherein the main wireless terminal modifies the initial second group key according to a modification time period to form at least one modified second group key, the modification time period being predetermined in the main wireless terminal; wherein the main wireless terminal transmits the at least one modified second group key to each of the (N−
1) sub wireless terminals, the at least one modified second group key being transmitted and used to encode data between the N wireless terminals during use of the first group key;wherein the main wireless terminal encodes the initial second group key using the first group key, and transmits the encoded initial second group key to the (N−
1) wireless terminals; andwherein the main wireless terminal encodes the at least one modified second group key using the initial second group key, and transmits the encoded modified second group key to the (N−
1) sub wireless terminals. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A wireless terminal using dual keys for cryptography, the wireless terminal for performing a key distribution center function in an ad-hoc group including other wireless terminals, the wireless terminal comprising:
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first means for creating an initial second group key in accordance with a first group key, for encoding data using the initial second group key, for transmitting the encoded data between the other wireless terminals, for modifying the initial second group key according to a predetermined modification time period to form at least one modified second group key, and for transmitting the at least one modified second group key to at least one wireless terminal, wherein the at least one modified second group key is transmitted and used to encode data during use of the first group key, wherein the wireless terminal encodes the initial second group key using the first group key, and transmits the encoded initial second group key to the other wireless terminals; and wherein the wireless terminal encodes the at least one modified second group key using the initial second group key, and transmits the encoded modified second group key to other wireless terminals. - View Dependent Claims (17, 20)
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18. A wireless terminal using dual keys for cryptography, the wireless terminal comprising:
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first means for creating a first group key, for receiving an initial second group key communicated using the first group key and a modified second group key, communicated using the initial second group key from another wireless terminal performing a key distribution center function in an ad-hoc group, for encoding data using the modified second group key, and for transmitting the encoded data between wireless terminals existing in the ad-hoc group, wherein the initial second group key is modified in the other wireless terminal performing the key distribution center according to a predetermined modification time period to form the at least one modified second group key, wherein at least one modified second group key is transmitted and used to encode data during use of the first group key, wherein the wireless terminal encodes the initial second group key using the first group key, and transmits the encoded initial second group key to the other wireless terminals; and wherein the wireless terminal encodes the at least one modified second group key using the initial second group key, and transmits the encoded modified second group key to the other wireless terminals. - View Dependent Claims (19)
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Specification