High speed copy protection method
OwnerJung-Wan Ko, Byung-Jun Kiminventors
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Abstract
A high speed copy protection method including encrypting a first region of a text containing a second encryption key data using a first encryption key, and encrypting a second region of the text using a second encryption key based upon the second encryption key data, and transmitting a cipher text. A large amount of cipher text data requiring high speed processing are processed using the second encryption key, which is a key used in a common key encryption method, and a smaller part of the cipher text data are processed using a larger first encryption key as used in a common key or a public key encryption method, thereby satisfying speed and security.
Claims45
A copy protection method to prevent unauthorized copying of digital data during digital data transmission between a sender and a receiver, comprising:
- encrypting a first region of a text containing a second encryption key using a first encryption key;
- encrypting a second region of the text using the second encryption key;
- and
- transmitting a cipher text comprising the encrypted first and second regions.
A copy protection method for decrypting a cipher text received from a sender who encrypts a first region of a text containing a second encryption key information using a first encryption key, encrypts a second region of the text using the second encryption key based upon the second encryption key information, and transmits the cipher text, the first encryption key, region segmentation information, and second encryption key information to a receiver, comprising:
- decrypting the first region of the cipher text using the transmitted first encryption key and the transmitted region segmentation information;
- extracting the second encryption key from the decrypted first region using the transmitted second encryption key information;
- and
- decrypting the second region of the cipher text using the extracted second encryption key.
A computer readable medium encoded with processing instructions for implementing a method of encrypting a text sent between a sender and a receiver performed by a computer, the method comprising:
- encrypting a first region of the text using a first encryption key, where the first region contains a second encryption key;
- and encrypting a second region of the text using the second encryption key.
A computer readable medium encoded with processing instructions for implementing a method of decrypting an encrypted text sent between a sender and a receiver performed by a computer, the method comprising:
- decrypting a first region of the encrypted text using a first encryption key, where the first region contains a second encryption key;
- decrypting a second region of the encrypted text using the second encryption key.
A sender for sending encrypted text, comprising:
- an authenticator to obtain a safe transmission path through which a first encryption key and information related to a second encryption key are sent;
- and
- an encryptor to encrypt a text using the first encryption key and the second encryption key, where the second encryption key is extracted from a portion of the text encrypted by the first encryption key.
A receiver for receiving encrypted text, comprising:
- an authenticator to obtain a safe transmission path through which a first encryption key and information related to a second encryption key are received, and
- a decryptor to decrypt a portion of the text using the first encryption key, to extract the second encryption key from the decrypted portion using the information related to the second encryption key, and to decrypt another portion of the text using the second encryption key.
Dependencies are inferred from the claim text.