17. The method of claim 15 , wherein, for a first archive file type of the plurality of different types of archive files, the descriptive information includes a hash value of the contained file in uncompressed format and a size of the contained file in uncompressed format.
17. The method of claim 15 , wherein, for a first archive file type of the plurality of different types of archive files, the descriptive information includes a hash value of the contained file in uncompressed format and a size of the contained file in uncompressed format. 21. The method of claim 17 , wherein, for a second archive file type of the plurality of different types of archive files, the descriptive information includes a digital signature and a size of the contained file in compressed format.