Cryptography – Communication system using cryptography
Reexamination Certificate
2008-04-15
2011-10-11
Lim, Krisna (Department: 2453)
Cryptography
Communication system using cryptography
C380S035000, C380S264000
Reexamination Certificate
active
08036383
ABSTRACT:
Provided are a method and apparatus for secure communication between cryptographic systems using a Real Time Clock (RTC). The method and apparatus allow a transmitting cryptographic system to transfer partial RTC data and a receiving cryptographic system to restore entire RTC data, thereby minimizing data to be transferred between the cryptographic systems. The method includes: calculating a largest RTC deviation between a transmitting cryptographic system and a receiving cryptographic system; calculating the smallest number of bits of partial data on an RTC required for restoring entire data on the RTC on the basis of the calculated largest RTC deviation; calculating the partial RTC data on the basis of the calculated smallest number of bits of the partial RTC data; and transferring the calculated partial RTC data to the receiving cryptographic system.
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Han Jae Woo
Kim Dong Chan
Kim Jae Heon
Park Sang Woo
Electronics and Telecommunications Research Institute
Ladas & Parry LLP
Lim Krisna
LandOfFree
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