Patent ID: 7532724
Filing Date: 2009-05-12
Classification: H04L

Abstract:
1. An encryption method for encrypting data in an ad-hoc network containing at least two hierarchical security classes, the method comprising: encoding data into a predetermined code using a public key of a first security class, which is a highest security class of the at least two hierarchical security classes; adding a private key of a second security class to which a user belongs, the second security class being lower than the first security class, to the predetermined code, so as to form an addition result; and generating a ciphertext by adding a secret key of the user to the addition result, so as to form the ciphertext, wherein: predetermined codes of respective security classes are sequentially embedded such that a higher predetermined code of a higher security class of the at least two hierarchical security classes is embedded in a lower predetermined code of a lower security class of the at least two hierarchical security classes.