Estimation of time within untrusted time device disconnected...

Details Estimation of time within untrusted time device disconnected... Estimation of time within untrusted time device disconnected...

2004-11-14

2008-08-12

Miska, Vit W (Department: 2833)

Horology: time measuring systems or devices

Combined with disparate device

C368S046000, C709S223000, C713S178000, C713S194000, C713S400000, C725S029000, C725S151000

Reexamination Certificate

active

07411868

ABSTRACT:
Upon connecting to a trusted device, an untrusted device: (a) acquires a trusted current time; (b) stores an elapsed time; (c) determines an estimated current time; and, (d) stores a time difference between the estimated current time and an untrusted current time. The untrusted device (e) repeats (b)-(d) until turned off. Upon being turned on and able to connect to the trusted device, the untrusted device (f) repeats (a)-(e). Otherwise, it: (g) determines a temporary current time; and, (h) compares the estimated current time of (c) with the temporary current time. The untrusted device, (i) where the estimated current time of (c) is less than the temporary current time, sets an offline current time as the temporary current time, or, (j) where the estimated current time of (c) is greater than the temporary current time, sets the offline current time as the estimated current time of (c).

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