Help with key issues

Im developing a backup file system for LANs in Java
Presently the client encrypts all files with the DES algorithm using the same key before sending them to a server. The key is generated the very first time the software is installed and stored in a file key.txt. All subsequent files will get encrypted using the key from this file.
The server keeps a record of which files(encrypted) it is holding for which client. The server obv does not keep the encryption key.
In my system, I want to implement a "Restore" system in which the client should be able to retrieve all his backed up files even if his entire HDD crashes. For this when the client comes up and the software is reinstalled, the user can command the software to start restore. The client searches the LAN for servers that may be holding its files (each computer on LAN will be identified through a unique user name) and retrieves them one by one.
Problem: Since the key.txt file is also lost because of HDD crash, the client will not able to decrypt the files for the user. Any suggestions on what can be done to address this issue? Does Java provide a way by which it always returns the same key given a username (string)?
Many thanks for your help
Message was edited by:
aybhave

Check out PBE. A snag would be that if I then knew the user name then I would know the key!

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Edited by: rjbanker on Mar 7, 2008 8:21 AM

SolarisSAinPA*
1.
-PostgreSQL 8.2 source code, (137004-02)
Utility used to install the update failed with exit code {0}.
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Patch: 121081-08 Obsoletes: Requires: 121453-02 Incompatibles: Packages: SUNWc cccrr, SUNWccccr, SUNWccfw, SUNWccsign, SUNWcctpx, SUNWccinv, SUNWccccfg, SUNWcc fwctrl
Patch: 122231-01 Obsoletes: Requires: 121453-02 Incompatibles: Packages: SUNWc ctpx
Patch: 120932-01 Obsoletes: Requires: Incompatibles: Packages: SUNWcctpx
Patch: 123123-02 Obsoletes: Requires: Incompatibles: Packages: SUNWccinv
Patch: 121118-12 Obsoletes: Requires: 121453-02 Incompatibles: Packages: SUNWc smauth, SUNWppror, SUNWpprou, SUNWupdatemgru, SUNWupdatemgrr, SUNWppro-plugin-su nos-base
2.
Where are all the drives? I don't know how to find the RAID box or the other 3 internal hard drives. When I >installed the OS, I think I installed it on only one hard drive and that might be part of the reason why the >medialibe update above says that I don't have enough space.
When you run format command, how many drives are listed? Identify your root drive (compare with output of df command you ran earlier) Please post here.2. Output of df-hk, looks like I ran out of room. Should I just go ahead and reinstall the OS?
Filesystem size used avail capacity Mounted on
/dev/dsk/c1t0d0s0 5.9G 5.4G 378M 94% /
/devices 0K 0K 0K 0% /devices
ctfs 0K 0K 0K 0% /system/contract
proc 0K 0K 0K 0% /proc
mnttab 0K 0K 0K 0% /etc/mnttab
swap 42G 1.3M 42G 1% /etc/svc/volatile
objfs 0K 0K 0K 0% /system/object
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5.9G 5.4G 378M 94% /platform/sun4u-us3/lib/libc_psr.so.1
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5.9G 5.4G 378M 94% /platform/sun4u-us3/lib/sparcv9/libc_psr.so.1
fd 0K 0K 0K 0% /dev/fd
swap 42G 1.1M 42G 1% /tmp
swap 42G 32K 42G 1% /var/run
/dev/dsk/c1t0d0s7 46G 47M 46G 1% /export/home
3. So I guess the general consensus is to reinstall the OS, is that correct?
4. There is nothing in \dev\rmt, and unfortunately I don't have a tape to test it with!
5. I guess 5GB will be ok for what we do.
Alan.pae*
1. I think the above text might explain why it failed, although I don't know how to correct it.
2. Output of format:
# mount
/ on /dev/dsk/c1t0d0s0 read/write/setuid/devices/intr/largefiles/logging/xattr/onerror=panic/dev=1d80008 on Mon Mar 10 10:56:51 2008
/devices on /devices read/write/setuid/devices/dev=4dc0000 on Mon Mar 10 10:56:19 2008
/system/contract on ctfs read/write/setuid/devices/dev=4e00001 on Mon Mar 10 10:56:19 2008
/proc on proc read/write/setuid/devices/dev=4e40000 on Mon Mar 10 10:56:19 2008
/etc/mnttab on mnttab read/write/setuid/devices/dev=4e80001 on Mon Mar 10 10:56:19 2008
/etc/svc/volatile on swap read/write/setuid/devices/xattr/dev=4ec0001 on Mon Mar 10 10:56:19 2008
/system/object on objfs read/write/setuid/devices/dev=4f00001 on Mon Mar 10 10:56:19 2008
/platform/sun4u-us3/lib/libc_psr.so.1 on /platform/sun4u-us3/lib/libc_psr/libc_psr_hwcap1.so.1 read/write/setuid/devices/dev=1d80008 on Mon Mar 10 10:56:50 2008
/platform/sun4u-us3/lib/sparcv9/libc_psr.so.1 on /platform/sun4u-us3/lib/sparcv9/libc_psr/libc_psr_hwcap1.so.1 read/write/setuid/devices/dev=1d80008 on Mon Mar 10 10:56:50 2008
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/tmp on swap read/write/setuid/devices/xattr/dev=4ec0002 on Mon Mar 10 10:56:52 2008
/var/run on swap read/write/setuid/devices/xattr/dev=4ec0003 on Mon Mar 10 10:56:52 2008
/export/home on /dev/dsk/c1t0d0s7 read/write/setuid/devices/intr/largefiles/logging/xattr/onerror=panic/dev=1d8000f on Mon Mar 10 10:56:57 2008
3. Judging by the above text I will be doing a reinstall huh?
4. Actually I am not familiar with tape backups let alone solaris backup apps! Any suggestions? (Preferably free, have to cut down on costs.)
5. No comment
Thanks for the help, hope to hear from you again!
rjbanker

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