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• PDF Encrypted, Hidden Watermark

  - by Dave Jarvis

  Background Using LaTeX to write a book. When a user purchases the book, the PDF will be generated automatically. Problem The PDF should have a watermark that includes the person's name and contact information. Question What software meets the following criteria: Applies encrypted, undetectable watermarks to a PDF Open Source Platform independent (Linux, Windows) Fast (marks a 200 page PDF in under 1 second) Batch processing (exclusively command-line driven) Collusion-attack resistant Non-fragile (e.g., PDF - EPS - PDF still contains the watermark) Well documented (shows example usages) Ideas & Resources Some thoughts and findings: Natural language processing (NLP) watermarks. Apply steganography on a randomly selected image. http://openstego.sourceforge.net/cmdline.html The problem with NLP is that grammatical errors can be introduced. The problem with steganography is that the images are sourced from an image cache, and so recreating that cache with watermarked images will impart a delay when generating the PDF (I could just delete one image from the cache, but that's not an elegant solution). Thank you!

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• Choosing Truecrypt volume names and keyfile names

  - by Howiecamp

  Any recommendations on what to name Truecrypt volumes (container files) and where to locate them? Certainly a name like "this is a truecrypt volume.tc" isn't a good idea. Any recommended storage locations? Same question for keyfiles that are generated with Truecrypt. Finally, lets say you choose an existing file, ymca.mp3, as your keyfile. Given that that file is innocuous and normal looking, isn't it easy to forget that's your key file so when you get sick of the Village People and delete the song you're hosed?

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• Encrypting peer-to-peer application with iptables and stunnel

  - by Jonathan Oliver

  I'm running legacy applications in which I do not have access to the source code. These components talk to each other using plaintext on a particular port. I would like to be able to secure the communications between the two or more nodes using something like stunnel to facilitate peer-to-peer communication rather than using a more traditional (and centralized) VPN package like OpenVPN, etc. Ideally, the traffic flow would go like this: app@hostA:1234 tries to open a TCP connection to app@hostB:1234. iptables captures and redirects the traffic on port 1234 to stunnel running on hostA at port 5678. stunnel@hostA negotiates and establishes a connection with stunnel@hostB:4567. stunnel@hostB forwards any decrypted traffic to app@hostB:1234. In essence, I'm trying to set this up to where any outbound traffic (generated on the local machine) to port N forwards through stunnel to port N+1, and the receiving side receives on port N+1, decrypts, and forwards to the local application at port N. I'm not particularly concerned about losing the hostA origin IP address/machine identity when stunnel@hostB forwards to app@hostB because the communications payload contains identifying information. The other trick in this is that normally with stunnel you have a client/server architecture. But this application is much more P2P because nodes can come and go dynamically and hard-coding some kind of "connection = hostN:port" in the stunnel configuration won't work.

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• SSH with authorized_keys to an Ubuntu system with encrypted homedir?

  - by Josh

  I recently set up a new server with Ubuntu karmic 9.10, and when I created my home directory I chose to make it encrypted. Now, after loading my authorized_keys file into ~/.ssh, it isn't recognized because my home directory isn't decrypted until after I log in. Is there a way to make SSH keys work with encrypted home directories under Ubuntu?

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• Can see partial encrypted in XP but not in windows 7

  - by RN09

  I used truecrypted V.6.3a to partially encrypted (5gb) on my 16gb usb flashdrive on my XP netbook and eveything was fine. However, I don't see the ecrypted partial (5gb) when stick the usb into windows 7-32 bits (desktop). Tried to re-encrypted the usb on windows 7 (desktop) but results are the same. No problem seeing it on XP but windows 7. Thanks

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• Buyers question: Have intel AES-NI already been integrated in IPSEC stacks?

  - by deploymonkey

  Dear serverfault, I need to decide between deploying Opteron 6100 and Xeon Westmere EP, so I regard this a platform question. If not, it may be moved to stackoverflow and I hereby declare that I am very sorry. Do any (F)OSS or proprietory IPSEC stacks already use the AES-NI functions of the Westmere-EP? Thanks a bundle! ps. If anyone would like to create the tag AES-NI, You're welcome. I couldn't due to lack of rep.

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• How to secure adhoc networks

  - by moshroum1

  What is the right way to secure adhoc networks? WPA_NONE is a cruel hack (doesn’t work most of the time, discards important packets, ..), WEP is not secure and Open… open is open. IPSec is a level to high. Does there exists something which works under linux and wifi?

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• How to proxy and encrypt all my internet traffic with Win7 and Win2008R2?

  - by Malartre

  Hi, I have a Windows 7 laptop and a Windows 2008 R2 server. How can I encrypt and route all my internet request from the Win7 laptop to the Win2008R2 server? I guess the server would be called a proxy? Goal is to prevent unencrypted network snooping. I found this article about using SSH, but I would prefer an official windows integrated solution. What's the Microsoft "way" on this? http://lifehacker.com/237227/geek-to-live--encrypt-your-web-browsing-session-with-an-ssh-socks-proxy I would like this to work for all internet traffic, not just browser traffic and I would like to set this up on many Win7 clients. Carl

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• Integrate GnuPG with Outlook

  - by Rohit

  I want to integrate GnuPG with Outlook in such a way that when it receives an email, it must automatically decrypt the mail using my private key and display on-screen.

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• Log and debug/decrypt an windows application's HTTPS traffic

  - by cweiske

  I've got a proprietary windows-only application that uses HTTPS to speak with a (also proprietary, undocumented) web service. To ultimately be able to use the web service's functionality on my linux machines, I want to reverse-engineer the web service API by analyzing the requests sent by the application. Now the question: How can I decrypt and log the HTTPS traffic? I know of several solutions which don't apply in my case: Fiddler is a man-in-the-middle HTTPS proxy which I cannot use since the application doesn't support proxies. Also, I do not (yet) know if it works with self-signed server certificates, which I doubt. Wireshark is able to decrypt SSL streams if you have the server's private certificate, which I don't have. any browser extension since the application is not a browser If I remember correctly, there have been some trojans that capture online banking information by hooking into/replacing the window's crypto API. Since the machine is mine, low level changes are possible. Maybe there is a non-trojan (white-hat) network log application out there which does the same? There is a blackhat presentation with some details available to read. They refer to Microsoft Research Detour for easy API hooking.

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• FDE with DiskCryptor V1 (TRIM Support) on Crucial M4 SSD on W7 x64 - Unpartitioned Space?

  - by JamesM

  I have a new Alienware m11 laptop with a brand new Crucial M4 128GB SSD. I have installed the SSD but not used it yet. I am thinking of using FDE with DiskCryptor 1.0.732.111. I will install Win7 Pro x64. I have read about support for TRIM in v1.0.732.111 but also about leaving unpartitioned space. My SSD drive, 'Crucual M4' does not have a manufacturer built-in reserve like other drives. My questions are: Should I leave some free unpartitioned space with v1 of DC and W7x64 even though it will support TRIM or should I not do this? Should I install DC v1 first or after installing Windows 7 (assuming it is brand new, never been used SSD)?

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• saving and searching encrypted mail

  - by student

  I often send and receive gpg-encrypted mail. At the moment I use thunderbird + enigmail (in linux) to do that. As far as I know there is no way in thunderbird to find all encrypted messages which bodies contain particular keywords. There also seems to be no option to save encrypted mails decrypted (so they would be searchable). However for me it is important to be able to search old encrypted mails. So my question is: Is there a way in linux to save incoming mails automatically decrypted in my inbox and save outgoing encrypted mail decrypted in the send folder? Both times adding a line to the body which remarks that the mail was encrypted. It could be another email client for linux that could to that or perhaps a solution using procmail or maildrop. For a procmail solution I guess there could be some problems with encoding (perhaps one have to use emil?) the solution should work well with german special characters in subject and body. Note that the solution should work for multipart encrypted messages (including encrypted attachments) too i.e. with everything which could thunderbird + enigmail generate. Further note that I don't want a discussion about security holes. For me it's ok if messages are stored decrypted on my harddrive (which is encrypted as a whole anyway). In doubt for a first solution it would be ok to store my private key passphrase in cleartext on my harddrive, too. The point is that the mails are encrypted on the mailserver or more generally on their "way through the net".

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• What is a good encryptable disk image format suitable for rsync on a PC?

  - by Greg Joshner

  I’m looking for a solution to encrypt my XP home directory and then rsync the encrypted image file to a remote server. Since I don’t want to transfer several Gigs for even the smallest change in the image I’m looking for a solution which saves the image “chunked” into smaller files. That way Rsync can transfer only the changed elements. Do you have any ideas? Thanks a lot for your help!

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• MySQL based authentication with crypt()ed password fails in Apache 2.2

  - by Fester Bestertester

  I'm trying to set up a simple CalDAV/CardDAV server with a Radicale backend and an Apache 2.2 frontend. So far, it's all nice and simple, but I can't get the MySQL based authentication to work. I'd like to authenticate users against an existing MySQL database, and I need the REMOTE_USER variable to be set (pretty much like in the configuration examples for Radicale). I've tried mod_auth_mysql, which authenticated the users nicely, but failed to set the REMOTE_USER variable. The newer alternative seems to be mod_authn_dbd, which doesn't seem to like the crypted passwords in the MySQL database. According to the documentation, crypted passwords should work, so maybe I'm just missing a simple parameter. The configuration looks like this: DBDriver mysql DBDParams "sock=/var/run/mysqld/mysqld.sock dbname=myAuthDB user=myAuthUser pass=myAuthPW <Directory /> AllowOverride None Order allow,deny allow from all AuthName 'CalDav' AuthType Basic AuthBasicProvider dbd require valid-user AuthDBDUserPWQuery "SELECT crypt FROM myAuthTable WHERE id=%s" </Directory> I've tested the query, it works fine. And as mentioned before, mod_auth_mysql worked nicely against the same database, but didn't set the required variables. Am I just missing some configuration parameter? Or is mod_authn_dbd just not the right tool to achieve what I want?

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• What are the technical differences between truecrypt, bit locker to go and an iron key?

  - by Craig

  I am looking to get a new USB drive (my old one took an unauthorized vacation) and am looking into how to secure the data on it. Ideally I would like a visible, unencrypted space that may or maynot be bootable then an encrypted area for low security files followed by a second encrypted space for the most secure files. Is there a solution that will handle this?

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• How can I automatically synchronize a directory tree on multiple machines?

  - by Blacklight Shining

  I have two Mac laptops and a Debian server, each with a directory that I would like to keep in sync between the three. The solution should meet the following criteria (in rough order of importance): It must not use any third-party service (e.g. Dropbox, SugarSync, Google whatever). This does not include installing additional software (as long as it's free). It must not require me to use specific directories or change my way of storing things. (Dropbox does this IIRC) It must work in all directions (changes made on /any/ machine should be pushed to the others) All data sent must be encrypted (I have ssh keypairs set up already) It must work even when not all machines are available (changes should be pushed to a machine when it comes back online) It must work even when the /directories/ on some machines are not available (they may be stored on disk images which will not always be mounted) This can be solved for Macs by using launchd to automatically launch and kill (or in some way change the behavior of) whatever daemon is used for syncing when the images are mounted and unmounted. It must be immediate (using an event-based system, not a periodic one like cron) It must be flexible (if more machines are added, I should be able to incorporate them easily) I also have some preferences that I would like to be fulfilled, but do not have to be: It should notify me somehow if there are conflicts or other errors. It should recognize symbolic and hard links and create corresponding ones. It should allow me to create a list of exceptions (subdirectories which will not be synced at all). It should not require me to set up port forwarding or otherwise reconfigure a network. This can be solved by using an ssh tunnel with reverse port forwarding. If you have a solution that meets some, but not all of the criteria, please contribute it in the comments as it might be useful in some way, and it might be possible to meet some of the criteria separately. What I tried, and why it didn't work: rsync and lsyncd do not support bidirectional synchronization csync2 is designed for server clusters and does not appear to work with machines with dynamic IPs DRBD (suggested by amotzg) involves installing a kernel module and does not appear to work on systems running OS X

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• Local admin password recovery: Windows Vista

  - by Jim Dennis

  I am faced with an unsettling situation. A friend of my father's has rather suddenly become a widower. Naturally they've taken care of the bank accounts and all the normal mundane things that people have been doing for a century or so. However, she was the computer user of the household. He was aware that they had some online banking stuff and bill paying stuff ... and that she spent lots of time on FaceBook and stuff like that. However, he doesn't know what her local passwords were (actually only vaguely aware that her couple of desktop and couple of laptop system even had passwords). He's never heard of "admin" passwords so that's no good either. In the past I've used KNOPPIX and the old LinuxCare "bootable business card" to recover NT passwords. I've never done this with MS Windows Vista. So, I'm looking for the best advice on how to do this. Naturally I do have physical access to the systems (the two laptops are charging across the room from me; and her old desktop systems are, naturally, still back at his place). Getting it right is much more important than fast or easy (I don't want to mess up those filesystems and possibly lose some photos or other stuff that he or his kids or grandkids will want). (BTW: if anyone things this is some social engineering hack to play upon the sympathies of the community to get the information I'm asking for ... think about it for a minute. I know about IRC and the "warez" boards. I know I can find this stuff out there if I dig enough. I'm just asking here because it'll hopefully be faster and, secondarily to raise awareness. As more of us put more of our lives online ... as we get older and as places like FaceBook continue to widen the appeal of computing to a broader segment of older people ... we are, as computer nerds, going to see a lot more of this. Survivors will needs us to be careful, sensitive and ethically responsible as they try to recover those bits of legacy during their bereavement. I can now tell you, first hand, it sucks!)

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• Autofill password in Google Chrome

  - by raoulsson

  Hi, I have to do a lot of loggin in on webpages and I like that firefox autofills in my passwords, once it knows them... How can I achieve the same for google chrome? I have read this post, installed the autofill=true extension but that does not do the job... Thanks!

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• Encrypted folders and files stay encrypted when copied

  - by user66126

  Hi all, I just tried out Windows 7 feature to encrypt a folder. I found that when I access the encrypted folder from another computer (the parent folder of the encrypted folder is shared) I can see the files there but I could not open it (which is good). But when I copy the file to another folder outside the encrypted folder (regardless it is on the same remote computer or to the computer from where I am accessing the files) then I can open the file without any problem. This might be how it works ... but that's not what I need. My question is: Can I encrypt a folder (and all files inside), access those files (create, edit) seamlessly while I am logged in normally to the computer ... but make the files stays encrypted when they were copied to another directory outside the encrypted folder? Regardless they were copied to the same computer or another computer or uploaded to a remote server. If this is not a feature that Windows natively support, is there third party software that does that? Thank you.

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• How to proxy and encrypt all my internet traffic with Win7 and Win2008R2?

  - by Malartre

  I have a Windows 7 laptop and a Windows 2008 R2 server. How can I encrypt and route all my internet request from the Win7 laptop to the Win2008R2 server? I guess the server would be called a proxy? Goal is to prevent unencrypted network snooping. I found this article about using SSH, but I would prefer an official windows integrated solution. What's the Microsoft "way" on this? http://lifehacker.com/237227/geek-to-live--encrypt-your-web-browsing-session-with-an-ssh-socks-proxy I would like this to work for all internet traffic, not just browser traffic and I would like to set this up on many Win7 clients. Carl

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• create log for an encrypted tar

  - by magiza83

  I want to create an encrypted tar but also I want to have a log of what tar has compressed, I'm using the following command: tar -cvvf - --files-from=/root/backup.cfg | openssl des3 -salt -k backuppass | dd of=/root/tmp/back.encrypted But I need to have a log of tar's stdout. I don't know how to get it, because If I use "" in tar command openssl result is not correct. I've also checked tar manual hoping to find some option to write stdout to a file, but I have found nothing. any help? thanks & Regards.

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• ext3: maximum recommended partition size / handling large partitions

  - by Hansi

  Hi! I would like to do an encrypted install of Ubuntu on a 2 Terabyte drive (i.e., using LUKS/DMcrypt). In order to not have to type in passwords too often, the partitioning scheme will be 50 GB for / and about 1 TB for /home (and the rest for Windows 7), just for clarity. Even though by now LVM is regarded as being stable, I don't want to bother having more room for errors by introducing unnecessary layers of complexity. For both Ubuntu partitions I want encrypted ext3 with the default blocksize of ext3 (4k?). Thoughts: When I look at most partition schemes here on this site or elsewhere, I usually see at most about 400 or 500 GB partitions (maybe I didn't see enough). There may be different reasons for this, but is reliability an issue here? Are larger ext3 partitions, like about 1 TB, harder to handle for the OS or filesystem driver or at some other level? If I make the partition too large, will it be harder to repair in case of corruptions? Are there some default settings for ext3 that I should change for 1 TB partitions? Question: What maximum partition size for ext3 do you recommend and why? Thanks!

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• Our company claims that the DLP system can even monitor the contents of HTTPS traffic, how is this possible?

  - by Ryan

  There is software installed on all client machines for DLP (Data Loss Prevention) and HIPAA compliance. Supposedly it can read HTTPS data clearly. I always thought that between the browser and the server, this was encrypted entirely. How can software sneak in and grab this data from the browser prior to it is encrypted or after it is decrypted? I am just curious as to how this could be possible. I would think that a browser wouldn't be considered very secure if this was possible.

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• Streamline Active Directory account creation via automated web site

  - by SteveM82

  In my company we have high employee turnover, and hence our helpdesk receives about a dozen requests per week for new Active Directory accounts. Currently, we receive these requests simply via e-mail or voice-mail, and rarely do we have all of the information necessary to create the account. I would like to find a web application that can be used by a manager or supervisor to formalize the requests they make for AD accounts for new employees under their command. Ideally, the application would prompt for all of necessary information, and allow the helpdesk to review the requests and approve or deny each one. If approved, the application would take care of creating the account and send an e-mail to the manager. I have found several application on the Internet that handle self-service account management (i.e., password resets or update contact info), which is also nice to have, but nothing that streamlines the new account request and creation part. Can anyone make suggestions on such an application? Thanks.

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• How to crypt and share a directory on OS-X via NFS?

  - by dgAlien

  We have an osx desktop Environment with nfs shares and using linux/vm´s as nfs-clients We want to encrpyt the nfs-data/directories on our os-x machines. Is that possible? Apple´s File-Fault is using kerberos, but file-fault data isnt´ accessible via nfs. Is there a possibility to use file-vault anyway or should we use truecrypt volumes? How do we setup truecypt/filevault + nfs?

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