Appeal No. 95-0143
Application 07/865,849
Pogue further teaches in column 2, lines 56-66, that these
objectives are accomplished by a method in which the key only
stores a secret key number and a unique key ID. In column 2,
line 67, through column 4, line 63, Pogue teaches the
initialization mode which allows a single key to operate with an
unlimited number of locks. The initialization mode is only done
once to introduce the key to a lock. During the initialization
mode, information Q is determined by encrypting the key’s secret
key, S, by a private key P and the key’s ID is transfered to the
lock. The key does not store the private key, P, but only stores
the secret key, S, and the key’s ID. The lock stores the key’s
ID, the private key, P, and information Q where Q=P(S). Pogue
teaches in column 4, lines 64-67, that this process allows the
key to only store the secret key, S, and its ID.
In column 5, lines 9-23, Pogue teaches the authentication
method as diagrammed in Figure 4. To start this mode, the lock
wakes up the key by sending out key IDs. If one of the key IDs
matches the key’s ID stored in the key, the key sends a reply.
Upon receiving a reply, the lock enters into the authentication
mode to verify that the key is an authorized unit. During this
mode, the lock sends a random number R and the Q which
corresponds to the ID which was matched in the key. The key
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Last modified: November 3, 2007