An encryption method for encrypting data for multi-level access control in an ad-hoc network including hierarchical security classes includes encoding data into a predetermined code using a first public key of a highest security class, adding a private key of a security class to which a user belongs, to the predetermined code, and generating a ciphertext by adding a second public key, published by the security class to which the user belongs, to the addition result. A corresponding decryption method includes subtracting the private key from the ciphertext, performing a first decoding using a secret key known by a security class, to which a receiver belongs, by the receiver of the ciphertext, and correcting errors included in the second public key and detecting the data by performing a second decoding of the result of the first decoding using a code known by the security class to which the receiver belongs.

 
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> Systems and methods for permitting open access to data objects and for securing data within the data objects

> Encryption/decryption device and method, encryption device and method, decryption device and method, and transmission/reception apparatus

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