Is ZIP compress-algo 1 or 2 ?
Thu Nov 14 22:46:01 2002
I've been told that I want to use ZIP compression to be
interoperable with PGP 7.x, but I'm not sure if my options file should
contain compress-algo 1 or compress-algo 2.
The gpg.man file that came with GnuPG 1.2.1-1 for Windows says this :
Use compression algorithm n. Default is 2 which
is RFC1950 compression. You may use 1 to use the
old zlib version (RFC1951) which is used by PGP.
0 disables compression. The default algorithm
may give better results because the window size
is not limited to 8K. If this is not used the
OpenPGP behavior is used, i.e. the compression
algorithm is selected from the preferences;
note, that this can't be done if you do not
encrypt the data.
I think the RFC references are transposed and it conflicts
with the output from the exe itself...
http://www.cis.ohio-state.edu/cgi-bin/rfc/rfc1950.html is ZLIB
gpg (GnuPG) 1.2.1
Copyright (C) 2002 Free Software Foundation, Inc.
This program comes with ABSOLUTELY NO WARRANTY.
This is free software, and you are welcome to redistribute it
under certain conditions. See the file COPYING for details.
Pubkey: RSA, RSA-E, RSA-S, ELG-E, DSA, ELG
Cipher: 3DES (S2), CAST5 (S3), BLOWFISH (S4), AES (S7), AES192 (S8),
AES256 (S9), TWOFISH (S10)
Hash: MD5 (H1), SHA1 (H2), RIPEMD160 (H3)
Compress: Uncompressed (Z0), ZIP (Z1), ZLIB (Z2)
So which is correct ? And is Zip=1 ?
Thanks : )
Jason S. Mantor, MCP
Senior Computer Programmer/Analyst
New York State Higher Education Services Corporation
Telephone: (518) 402-3545