Patent ID: 11876542
Assignee: UNIVERSITY OF TSUKUBA
Field: Basic communication processes (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 21:
22. The data compression and decompression method according to claim 1, wherein
the compression apparatus transmits a common key, which includes a combination of two or more parameters selected from among a plurality of parameters set for compression processing for the symbols, to the decompression apparatus, then performs encryption using the common key on a combination of the index data indicating non-compression and the symbols and a combination of the index data indicating compression and the positional information, and transmits a result of the encryption to the decompression apparatus, and
the decompression apparatus sets the two or more parameters in the common key transmitted from the compression apparatus for decompression processing of outputting the symbols using the combination of the index data indicating non-compression and the symbols or the combination of the index data indicating compression and the positional information, performs decryption of the result of the encryption using the common key, and performs the decompression processing for the decrypted result.