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  • What is a "good" tool to password-protect .pdf files?

    - by Marius Hofert
    What is a "good" tool to encrypt (password protect) .pdf files? (without being required to buy additional software; the protection can be created under linux but the password query should work on Windows, too) I know that zip can do it: zip zipfile_name_without_ending -e files_to_encrypt.foo What I don't like about this is that for a single file, you have to use Winzip to open the zip and then click the file again. I rather would like to be prompted for a password when opening the .pdf (single file case). I know that pdftk can do this: pdftk foo.pdf output foo_protected.pdf user_pw mypassword. The problem here is that the password is displayed in the terminal -- even if you use ... user_pw PROMPT. But in the end you get a password-protected .pdf and you are prompted for the password when opening the file.

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  • Getting the EFS Private Key out of system image

    - by thaimin
    I had to recently re-install Windows 7 and I lost my exported private key for EFS. I however have the entirety of my user directory and my figuring that the key must be in there SOMEWHERE. The only question is how to get it out. I did find the PUBLIC keys in AppData\Roaming\Microsoft\SystemCertificates\My\Certificates If I import them using certmg.msc it says I do have the private key in the information, but if I try export them it says I do not have the private key. Also, decryption of files doesn't work. There is also a "keys" folder at AppData\Roaming\Microsoft\SystemCertificates\My\Keys. After importing the certificates I copy those over into my new installation but it has no effect. I am starting to believe they are either in AppData\Roaming\Microsoft\Protect\S-1-5-21-...\ or AppData\Roaming\Microsoft\Crypto\RSA\S-1-5-21-...\ but I am unsure how to use the files in those folders. Also, since my SID has changed, will I be able to use them? The other parts of the account have remained the same (name and password). I also have complete access to the user registry hive and most of the old system files (including the old system registry hives). I do keep seeing references to "Key Recovery Agent" but have not found anything about using, just that it can be used. Thanks!

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  • What should I encrypt in Debian during install?

    - by ianfuture
    I have seen various guides and recommendations on web about how best to do this but nothing that clearly explains the best way and why. So I understand there is a need for part of Debian during install to be un-encrypted on its own partition to allow it to boot. Most info I have seen is call this /boot and set the boot flag. Next I believe the best approach is to create another partition out of all the rest of the disk space, encrypt this, then on top of that create a LVM and then within the LVM create my various partitions , name them , select size, and file system type. Can I include /swap in the encrypted LVM part ? Is this approach sound? If so what are the partitions I should use (this is going to be a minimal server install with a view to install as and when what I need for a dev server)? Finally how does the installer know what to put in each partition I define ? I appreciate there are more than one question but any help and suggestions would be appreciated. If further clarification is needed please mention in the comments . EDIT : 16/3/2010 After Richard Holloways reply I thought it relevant to add this info: The reasons why I want to do this are to explore maximising security on any server install and set up, due to interest in the area of Computer Security and Forensics. Also I am trying to peform the task as if it being performed in an enterprise situation. On a technical matter, once set up and configured with minimal packages and ssh this server will not physically be easy to access so I will only be entering via ssh. (Yes I know why encrypt something no one will ever be able to get their hands on? Because I can and I want to is the simple answer, but see above too).

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  • Fully secured gateway web sites

    - by SeaShore
    Hello, Are there any web sites that serve as gateways for fully encrypted communication? I mean sites with which I can open a secured session, and then to exchange through them with other sites in a secure way both URLs and content? Thanks in advance. UPDATE Sorry for not being clear. I was wondering if there was a way to access any site over the Internet (http or https) without letting any Intranet-proxy read the requested URL or the received content. My question is whether such a site exists, e.g.: I am connected to that site via https, I send it a URL in a secured way, the site gets the content from the target site (possibly in a non-secured way) and returns to me the requested content in a secured way.

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  • How to mount encrypted volume at login (Ubuntu 12.04, pam_mount)

    - by Nick Lothian
    I'm trying to get pam_mount working on Ubuntu 12.04. I have /dev/sda1 (encrypted partition) with /dev/dm-1 (ext4 formatted) inside it. Should ~/.pam_mount.conf.xml be trying to mount /dev/sda1 or /dev/dm-1? If I use the line: <volume fstype="ext4" path="/dev/dm-1" mountpoint="~/slowstore" options="rw" /> then it nearly works. It prompts for the password (ok, I'd like pam_mount to do that for me, but still..) then I get: pam_mount(rdconf2.c:126): checking sanity of luserconf volume record (/dev/dm-1) pam_mount(rdconf2.c:132): user-defined volume (/dev/dm-1), volume not owned by user If I do: sudo chown nick:disk /dev/dm-1 Then re-login the encrypted partition mounts correctly (ignoring th fact I have to reneter the password). However, if I log out completely the ownership on /dev/dm-1 gets reset to root:disk. What am I doing wrong?

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  • SSH Tunnel doesn't work in China

    - by Martin
    Last year I was working in China for a few months. I never bothered setting up a real VPN, but just created a SSH tunnel, and changed my browsers proxy settings to connect through it. Everything worked great (except flash of course) but that was fine. However, now I'm back in China but I'm having problems with this approach. I do the same thing as last time, and according to https://ipcheckit.com/ my IP address is indeed the IP of my (private) server in the US, and I'm logging in to my server using a fingerprint I created long before going to China so no MITM should be possible. Furthermore the certificate from ipcheckit.com is from GeoTrust - so everything should be OK However, I still can't access sites which are blocked in China. Any idea how this could be possible?

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  • Partitioning of Ubuntu server which will use OpenVZ and encrypted partitions (unlocked through SSH l

    - by DeletedAccount
    Hi, I'm about to install a server. Some context: My HDD is 1 TB and I have 2 GB RAM Ubuntu Server Lucid Lynx AMD 64 I will use OpenVZ and have most functionality separated into containers. To support disk quotas I need to use ext3 (not ext4) for the container partition. Each time I reboot the server I want to be forced to login through SSH and mount the encrypted partitions by typing my password (if someone steals the server, no critical data should be available). I want to have as much as possible encrypted. Yet I want to be able to login through SSH as I don't have a monitor or keyboard at the server. I am not sure how big I need my partitions to be. Being able to resize them later would be nice. I guess it implies using LVM? But the manual partition mount using SSH is also very important (in fact it's more important, if I have to pick one). How do you recommend that I partition the HDD? If I have daemons which needs the encrypted partitions, will they fail and can I just restart them after mounting the needed partitions?

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  • Can files deleted on an ecnrypted drive be restored?

    - by roddik
    Hi. There are ways to restore files, deleted from the system by default, I'm not sure about the way they work but I guess thet read content, that has not been overwritten. On the other hand, there are programs (e.g. TrueCrypt), that encrypt disks, claiming that it wouldn't be possible to tell apart random data and file contents on such a disk without a password. Therefore I think that files, deleted from such disks can't be restored. Is that correct? I know one way to find out would be to try it, but there is a possibility, that I would just pick the wrong restoring software. Moreover, I'm more interested in theorethical explanation why it would/wouldn't be possible. Thanks

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  • Access denied to EFS encrypted files after PC joins domain

    - by mjmarsh
    I'm experiencing strange behavior with Windows Encrypted File System: I have a machine that is in workgroup mode (not joined to a domain) I encrypt an entire directory structure on the machine (basically a folder and subfolders with data files for my application). My application writes and reads files from the encrypted file hierarchy as a local Windows user (let's call the account 'SecureUser'). This works fine I then join the PC to a domain (Let's call it 'TEST') Afterwards, processes running as the local 'SecureUser' account can't read the files it wrote originally when it was off the domain (What is also strange is that the files are listed as "read only" now and I cannot unset this flag via Windows Explorer or the command line, even though it looks like it succeeds) I then 'un-join' the PC from the domain and everything works again Is there something about changing domain membership on a PC that changes the behavior of EFS so that previously encrypted files cannot be read, even by the originating user? Thanks in advance

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  • Can I install fresh Linux accross partitions (LUKS & LVM) and preserve/use existing home user?

    - by xtian
    With an existing LUKS encrypted logical volume partitioned hard disk dual boot to Windoz and Linux (Fedora 15), is it necessary to "start over" with the LUKS setup when upgrading the system? I recall some note about dividing the Linux installation over different partitions would help to preserve the home data in future update (I can't find this now) Before I try it, is this possible and intended use case for partitioning a Linux installation? # lsblk -fa NAME FSTYPE LABEL MOUNTPOINT sda [80G] +-sda1 [system W95 FAT 32] vfat +-sda2 ext4 /boot +-sda3 [52.4G] crypto_LUKS +-luks-de25ac97-6a32-4b79-a6a0-296a39376b3b (dm-0) LVM2_member +-cryptVG-root (dm-1) [21.5G] ext4 / +-cryptVG-swap (dm-2) [5.4MB] swap [SWAP] +-cryptVG-data (dm-3) [25.6G] ext4 /home

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  • Hardware recommendations for building an Ubuntu encrypted file server

    - by Robert Mashlan
    I would like to build a file server for my home network using Ubuntu. It will serve files from RAID1 configured disks, either in the OS or in hardware. It will be connected to a Gigabit ethernet LAN. The disks will use an encrypted file system. It will serve samba shares. I would like a recommendation on what kind of processing power/memory I would need to build a box that would be able to sustain the full capacity of the Gigabit ethernet connection in a file transfer for a single connection with the overhead of serving from an encrypted disk. I'm not looking to build a dream server, I just want enough processing capacity for high performance (and reliable) file sharing and spend as little as possible for it. This may be tangential, but what kind of hardware would I need to have a server be able to reliably go into a low power mode when no requests are being made of it?

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  • Cloud storage services offering one-time download links? [closed]

    - by TARehman
    Is anyone aware of consumer-targeted cloud storage services that allow users to generate a one-time download link for hosted files? Case in point: I have an encrypted container with some documents I need to send to a vendor. I would prefer to give them a one-time download link, so that I know when they have accessed the file, and then inform them of the passphrase by phone. I have heard that MediaFire offers 1-time links, but that they are buried in tons of advertising. At the moment, I'm not sure that I consider MediaFire fully legitimate; I'm more interested in solutions with Google Drive, Box.net, DropBox, etc.

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  • Windows 7 Synchronize folders BUT while some files are open

    - by Nick
    I need some way to synchronize 2 drives I have. I want to do this ofter (once a day or so) There is the main drive that I want to clone/synchronize on a backup hard disk. The problem is in that there is an open TrueCrypt file mounted as a drive, and its live. If you don't know what true crypt is, basically you create a file on a hard disk and that file is encrypted. It's constantly open and modified live. Also Its pretty large. 100GB + I will use freefilesync . There are many tools that can do that. My question is, is it safe to copy the encrypted file while its open ? Does the software freeze the file in one state and copies it ? Or will I get a corrupted file on the other drive ? It was not clear to me how windows handles that. I read something about shadow copy, and the software says that it supports this. Does anyone know something on the matter that can help me ? or some software that will work ok in my scenario ? Thanks

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  • Truecrypt rescue usb

    - by geekbutitsokk
    i have found tutorials on their official forum and on the internet about how to make a truecrypt rescue bootable usb stick. I'm guessing anyone who can answer will know what that is already, but it is basically just a way to boot into the system using a usb stick instead of a DVD. But the only problem is all of these tutorials involve using Grub4Dos, and i cannot run Grub4Dos on 64 bit windows 7. Is there any other alternative method? Thanks!

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  • Linux Has Become Very Slow Dealing With Large Data

    - by Kohjah Breese
    Last year I bought a computer, for around $1,800, so it is relatively high-end. When I first got it I was particularly pleased at how quick it dealt with large MySQL queries, imports and exports. But somewhere along the way something has gone wrong and I am not sure how to diagnose the problem. Any job that involves processing large amounts of data, e.g. gzipping file c. 1GB+, UPDATEs on large MySQL tables etc. have become very slow. I just performed an intensive alter statement on a 240,000,000 row table on a remote server, which is lower spec. This took about 10 minutes. However, performing the same query on a 167,000,000 row table on my computer went fine until it hit 860MB. Now it is only writing about 1MB every 15 seconds. Does anyone have any advice as to debugging what the issue is? I am using LinuxMint (based on Ubuntu 12.04.) The home partition is encrypted, which really slows down gzip. I have noticed the swap is barely used, but am not sure if that is because there is more than enough RAM. The filesystem is ext4. The MySQL server is on a separate hard drive, but it was fine when I first installed it. Other than the above issues, there are no other problems with it. I am going to install a fresh Ubuntu on the 4th hard drive to see if that is any different.

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  • Encrypted directory makes file operations for whole disk very slow

    - by user1566277
    I am running an arm GNU/Linux and I have a SD-Card with three partitions on it. On one of the Partition I create an encfs file and then mount it on a directory which is in another partition to make that directory encrypted. Works fine. But now the writing speed on all the partitions are reduced drastically. I can understand that it should be slow for encrypted directory but why the its reducing write speed for all the partitions. E.g., if do not mount the encrypted directory 20MB is transferred in 2 Sec. roughly but with the encrypted directory mounted its like 20 Seconds for same file. I am using LUKS and all the partitons are ext3 except for the directory where /dev/mapper/encfs is mounted as type ext2. Any hints?

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  • Is it possible to create a full "encrypted worried about privacy" VPS, but still being externally us

    - by Somebody still uses you MS-DOS
    I've been reading a lot of things about privacy, "being in control of your data" and everything, and now a project called diaspora* is trying to be an OSS Facebook alternative. Fact is: you still have to use a server. Even if you use a VPS somewhere, they still have access do your data, so diaspora* isn't that protective shell people are looking for absolute power over your data unless you create a server on your basement. My question is: is it possible to create a really encrypted usable server using a VPS? From database to source files? If not, what it can be "obfuscated" or encrypted? (And just a mention, not really my question, do you think is diaspora* really possible to be made?) (I know if you really want privacy you shouldn't be even using these services and being social, but I'm asking if it's possible to at least avoid companies using your data)

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  • How to securely control access to a backend key server?

    - by andy
    I need to securely encrypt data in my database so that if the database is dumped, hackers are unable to decrypt the data. I'm planning on creating a simple key server on a different machine, and allowing the DB server access to it (restricted by IP address on the key server to permit the DB server). The key server would contain the key required to encrypt/decrypt data. However, if a hacker were able to get a shell on the DB server, they could request the key from the key server and therefore decrypt the data in the database. How could I prevent this (assuming all firewalls are in place, DB is not connected directly to the internet, etc)? i.e. is there some method I could use that could secure a request from the DB server to the key server so that even if a hacker had a shell on the DB server they'd be unable to make those same requests? Signed requests from the DB server could make issuing these requests less trivial - I suppose that'd help increase the amount of time it'd take to compromise the key server, something a hacker probably wouldn't have much of. As far as I can see, if someone can get a shell on the DB server everything's lost anyway. This could be mitigated by using one key per data item in the DB so at least there's not a single "master" key, but multiple keys that the hacker would need to access. What would be a secure method of ensuring requests from the DB server to the key server were authentic and could be trusted?

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  • How to generate Serial Keys? [closed]

    - by vincent mathew
    Which software can I use to generate Product keys if I have the GroupId, KeyId, Secret and Hash for the generation? Edit: I had seen a post which generated Product Keys using this information. [Additional Key Details/Activation Decryption*: GroupId = 86f 2159 KeyId = ed46 60742 Secret = e0cdc320ba048 3954789545910344 Hash = 5f 95 ] So I was wondering if there is any software which could generate keys using this information? Thanks.

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  • Best password practices?

    - by sansenya
    for sensitive data, would it be better to have a somewhat long, but memorable password (and hence not totally random) or use a program like keepass to make a super long, random password with the highest possible entropy, and then just write down the password on a piece of paper kept in ones pocket. If that bang on the door comes, then swallow the paper. Which is a better security practice? I'm not in any way a criminal, i just am curious about topics concerning security. Thanks.

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