Cryptography – Key management
Reexamination Certificate
2007-05-29
2007-05-29
Smithers, Matthew (Department: 2137)
Cryptography
Key management
C380S270000
Reexamination Certificate
active
10114684
ABSTRACT:
An encryption and decryption method applied upon transmitting a plaintext in a communication network containing plural subscriber ends is provided. The method includes steps of: picking a synchronization variation secret key from a first subscriber end, the value of the synchronization variation secret key synchronously varying at the subscriber ends; executing a first operation on the synchronization variation secret key by the first subscriber end to obtain an automatically changed secret key; utilizing the automatically changed secret key to process a subsequent encryption to the plaintext by the first subscriber end so as to obtain a ciphertext to be transmitted to a second subscriber end; receiving the ciphertext and picking the synchronization variation secret key by the second subscriber end to execute the first operation and obtain the automatically changed secret key; and utilizing the automatically changed secret key to process a subsequent decryption to the ciphertext by the second subscriber end so as to obtain the plaintext.
REFERENCES:
patent: 2002/0009199 (2002-01-01), Ala-Laurila et al.
patent: 2003/0095663 (2003-05-01), Nelson et al.
patent: 2003/0210787 (2003-11-01), Billhartz et al.
patent: 2003/0219129 (2003-11-01), Whelan et al.
ADMtek Incorporated
Smithers Matthew
LandOfFree
Method and device for encryption and decryption does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and device for encryption and decryption, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and device for encryption and decryption will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3822463