Corrupted Files -- Need Help

[Steve Butler]

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After several months of smooth operation we have received 3 different
copies of a file that we are unable to decrypt.

AFAIK nothing has changed on either side. 

1.  All three files are exactly the same length, 1280 bytes.  This does
seem odd as most files that I encrypt a 2nd time are usually several
bytes different in size.


2.  All three files are different starting in byte 20.  The first 32
bytes from each file are (from xxd)

File1:  a803 5047 50c1 c14e 036b a0ba 0a5a 2cea   4810 07ff 6e41 b28f
b07b e150 7c3c 020d

File2:  a803 5047 50c1 c14e 036b a0ba 0a5a 2cea  4810 07fd 1ab3 4d1a
2290 7606 3c63 7ed8 

File3: a803 5047 50c1 c14e 036b a0ba 0a5a 2cea   4810 07ff 5559 d7c0
8165 8a9a 3e6f a799 


3.  Each file ends with a different number of hex zeros:

File1:  113 hex zero bytes at tail of file.  Last byte before zeros is
hex 27

File2:  Also has 113 hex zero bytes preceeded by hex F0.

File3:  Has 48 hex zeros preceeded by hex 06.


4.  gpg --no-batch --verbose --list-packets

File1:
:marker packet:
 50 47 50
:pubkey enc packet: version 3, algo 16, keyid 6BA0BA0A5A2CEA48
   data: [2047 bits]
   data: [2046 bits]
gpg: public key is 5A2CEA48
gpg: using secondary key 5A2CEA48 instead of primary key 1B32D54B

You need a passphrase to unlock the secret key for
user: "First Choice Health Network (FCHN) <helpdesk at fchn.com>"
gpg: using secondary key 5A2CEA48 instead of primary key 1B32D54B
2048-bit ELG-E key, ID 5A2CEA48, created 2001-10-16 (main key ID
1B32D54B)

:encrypted data packet:
   length: 630
gpg: encrypted with 2048-bit ELG-E key, ID 5A2CEA48, created
2001-10-16
      "First Choice Health Network (FCHN) <helpdesk at fchn.com>"
gpg: AES encrypted data
:compressed packet: algo=1
:literal data packet:
   mode b, created 268435456, name="enc_20031201_1339",
   raw data: 0 bytes
gpg: [don't know]: invalid packet (ctb=3b)
:compressed packet: algo=153
gpg: uncompressing failed: unknown compress algorithm
gpg: WARNING: message was not integrity protected


File2:
:marker packet:
 50 47 50
:pubkey enc packet: version 3, algo 16, keyid 6BA0BA0A5A2CEA48
   data: [2045 bits]
   data: [2047 bits]
gpg: public key is 5A2CEA48
gpg: using secondary key 5A2CEA48 instead of primary key 1B32D54B

You need a passphrase to unlock the secret key for
user: "First Choice Health Network (FCHN) <helpdesk at fchn.com>"
gpg: using secondary key 5A2CEA48 instead of primary key 1B32D54B
2048-bit ELG-E key, ID 5A2CEA48, created 2001-10-16 (main key ID
1B32D54B)

:encrypted data packet:
   length: 630
gpg: encrypted with 2048-bit ELG-E key, ID 5A2CEA48, created
2001-10-16
      "First Choice Health Network (FCHN) <helpdesk at fchn.com>"
gpg: AES encrypted data
:compressed packet: algo=1
:literal data packet:
   mode b, created 268435456, name="enc_20031201_1339",
   raw data: 0 bytes
gpg: block_filter 0x80e3fe0: read error (size=8302,a->size=57479)
gpg: packet(7) with unknown version 255
gpg: WARNING: message was not integrity protected
gpg: block_filter: pending bytes!


File3:
:marker packet:
 50 47 50
:pubkey enc packet: version 3, algo 16, keyid 6BA0BA0A5A2CEA48
   data: [2047 bits]
   data: [2047 bits]
gpg: public key is 5A2CEA48
gpg: using secondary key 5A2CEA48 instead of primary key 1B32D54B

You need a passphrase to unlock the secret key for
user: "First Choice Health Network (FCHN) <helpdesk at fchn.com>"
gpg: using secondary key 5A2CEA48 instead of primary key 1B32D54B
2048-bit ELG-E key, ID 5A2CEA48, created 2001-10-16 (main key ID
1B32D54B)

:encrypted data packet:
   length: 695
gpg: encrypted with 2048-bit ELG-E key, ID 5A2CEA48, created
2001-10-16
      "First Choice Health Network (FCHN) <helpdesk at fchn.com>"
gpg: AES encrypted data
:compressed packet: algo=1
:literal data packet:
   mode b, created 268435456, name="enc_20031130_2400",
   raw data: 0 bytes
gpg: [don't know]: invalid packet (ctb=73)
gpg: packet(5) with unknown version 25
gpg: WARNING: message was not integrity protected


I'm open to suggestions, ideas or requests for more information.

- --Steve Butler
Oracle Administrator
First Choice Health Network
sbutler at fchn.com
206-268-2309
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