Cryptography is the collective term for algorithmic techniques used to secure data from unauthorized entities.

learn more… | top users | synonyms

0
votes
1answer
31 views

Enable GPU for cryptocurrency mining while running monitor off IGP?

Users in the cryptocurrency community usually solve this by either: -Using DVI-A or such to vga adaptor and make a dummy plug with resistors. However, all my hardware run with DVI-D. Vga adaptors ...
1
vote
1answer
31 views

OpenSSL ECDSA sign and verify file

I would like to sign and verify a pdf with elliptic curve. I got some code but it dosen't work. Create private key: openssl ecparam -genkey -name secp384r1 -noout -out private.pem Create public ...
-2
votes
2answers
43 views

Is it possible to generate a file from a md5sum (or sha1 or such)?

Is it possible to recreate a file if you have the files md5sum? Or is it only possible through brute-force? Is it any differences between the different algorithms?
0
votes
1answer
34 views

Why would one want to tag the computer where a key pair was made in a public key?

While trying to give an host a bit more of security, i decided to switch to SSH key's authentication. To do so i followed this guide, but something makes no sense in my mind. While the host is the ...
5
votes
2answers
96 views

Human-readable dump of gpg public key

Is there some tool to write out the actual content of a GnuPG public key in a way a human can unserstand? I mean not only ascii-armor which a human can read and type, but something which really breaks ...
0
votes
2answers
42 views

Hand creating a password using website name as salt [closed]

A while ago I read a blog on a method of creating passwords. It was something along the lines of: 1) create a template password, with usual mix of chars, cases, etc. 2) use the website name the ...
3
votes
1answer
854 views

“line length exception” in hashcat (kali linux)

I've received this line: root:$1$25A116L54$7/IbiL1ZsUyPwYBx/zuNv/ and asked to crack the password. So, I created a crack.hash file and put the following in it: $1$25A116L54$7/IbiL1ZsUyPwYBx/zuNv/ ...
2
votes
1answer
2k views

SSHD HMAC Configuration

I have read and understand the posting from here, Secure Configuration of Ciphers/MACs/Kex available in SSH. However, I would like to know what the /etc/sshd_config configuration would look like ...
0
votes
0answers
140 views

How to conduct a rolling data corruption test of a network connection?

I had problems installing some software packages on a Windows XP computer. I started troubleshooting the problem and at the end I decided to do a cryptographic test, and bingo! I had found the reason ...
8
votes
3answers
423 views

How to install True Image on Windows XP?

I have 1 license of Acronis True Image 2011 for 1 PC. I had it previously installed on my Windows Vista machine and it was working. Now, I wanted to move it to a Windows XP machine, by uninstalling it ...
0
votes
0answers
336 views

LUKS with Serpent and SHA512, CBC ESSIV

I am trying to setup my new Gentoo system (I believe this is not relevant, as this is not Gentoo specific question) with LUKS while trying to use: cat smth | cryptsetup luksFormat /dev/sda10 -c ...
4
votes
1answer
892 views

How can I use GnuPG with ECDSA keys?

I'd like to generate an ECDSA (rather than RSA, DSA, or ElGamal) key using GnuPG, and use it as I might otherwise use an OpenPGP-compatible master key. I've read that gpg2has support for ECDSA keys, ...
0
votes
0answers
118 views

An error has prevented the signing process from completing [-2146893802]

I have a couple of clients that are unable to perform digital signatures on Outlook emails, Adobe Pro documents, or on an internal Web Forms application (I can't get any specifics about this ...
0
votes
0answers
42 views

openssl creates invalid signature if run by a different user

Very strange problem here: openssl successfully creates signatures but only those created as root are valid whereas created by another user (www-data) are invalid! All files are readable and there are ...
0
votes
3answers
75 views

Is it a good idea to use a long password that contains patterns? [closed]

Let's say one wants to encrypt a file using a passphrase (not a key), gpg can do that. Assuming a short passphrase, does it make sense to make use of a longer passphrase that is the short one ...
1
vote
1answer
459 views

Openssl decrypt from encrypted text from command issue

I am using following command to decrypt an base64 string. openssl enc -in ciphertext -out binarytext -d -a openssl rsautl -decrypt -in binarytext -out plaintext -inkey private.pem I am facing an ...
3
votes
1answer
4k views

Why are there so many files in C:\ProgramData\Microsoft\Crypto\RSA\MachineKeys

I am running out of disk space on C:-drive. We see many (millions of) files in C:\ProgramData\Microsoft\Crypto\RSA\MachineKeys What are these files ? Why are so many files created? How can we ...
5
votes
1answer
662 views

Vim no longer prompts for encryption key when reading encrypted file; why not, and how can I get this restored?

I recently began using Vim to encrypt text files (by using the :X command and entering an encryption key at the prompt). As documented, Vim then prompts for that key when I reopen the file and ...
0
votes
1answer
80 views

Computing Number of Bits in Public Key

I am working with DKIM and trying to compute the public key size of some DKIM signatures. I know from tools that Gmail's is now 2048, but how could I have figured this out myself (i.e., what exact ...
2
votes
2answers
284 views

how to verify the trust path to a gpg key?

I want to check whether the gpg key used by Julien Danjou for his emacs snapshot repository can be trusted. There are many trust paths from my key to Juliens key. But I can't believe that there ...
1
vote
1answer
327 views

How to open a LUKS, OTFE .vol?

I feel like this is a dumb question, but I can't find the answer anywhere. I have a .vol, LUKS/OTFE. I know the password. How can I open it? This should be simple, but the closest answer I've ...
4
votes
2answers
689 views

What is id_rsa.keystore?

In my .ssh directory I have the following files - drwx------ 2 rohit rohit 4096 Jun 22 03:34 ./ drwxr-xr-x 62 rohit rohit 4096 Jun 22 11:16 ../ -rw-r--r-- 1 rohit rohit 402 May 25 15:19 ...
1
vote
1answer
179 views

How to encrypt email with recipient's key?

I need to send an encrypted email to someone who has published his key. He doesn't have mine, so instead of encrypting the email with my private key as usual, I think I have to use his public key. ...
1
vote
1answer
326 views

How many guesses per second are possible against an encrypted disk? [closed]

I understand that guesses per second depends on the hardware and the encryption algorithm, so I don't expect an absolute number as answer. For example, with an average machine you can make a lot ...
0
votes
1answer
207 views

per-host-pair cryptographic keys on a network

Got a homework question here that I have been staring at for a while. I am being asked how many keys will exist in a network of 'n' number of nodes with keys being distributed on a per-host-pair ...
0
votes
1answer
35 views

Creating and evaluating digital signed signatures for authentication etc

This question is triggered by an email from Microsoft this morning about a security bulletin. It started with -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 and ended with a PGP signature. I've ...
1
vote
1answer
212 views

Is Data Object on openPGP smartcard v2 encrypted?

Currently I thinking about on-the-fly disk encryption using Truecrypt/dmcrypt LUKS with key stored on smartcard. I would like to use openPGP v2 smart card, respectively GPF Cryptostick which is based ...
1
vote
2answers
292 views

Encrypt a file without common tools [closed]

I am guessing this probably has a really long answer, so feel free to give a little explanation, with a link to a helpful article, tutorial or w.e How can I encrypt a file without using one of those ...
3
votes
1answer
491 views

Windows CryptoAPI store?

I just discovered that windows can store certificates and keys that an application uses in a 'crypto store'. I would like to know how secure the store is? If I select for example high security and ...
0
votes
1answer
134 views

Disabling or removing a crypto partition

I accidentally created a crypto partition on a Debian server I recently installed. When I reboot the server I have to enter the passphrase to manually get the server into the right runlevel. Is ...
4
votes
3answers
701 views

protecting Dropbox files - Dropbox & encryption

I'm using Dropbox to sync files. There's a big disadvantage that files are stored somewhere unencrypted. I'd like to encrypt and decrypt them on the client, but have no clue how to do it. Tried ...
2
votes
2answers
2k views

Public key in hex format, conversion to base64

Hi I'm new to cryptogragraphy and have no idea how to do this. So i get a public key from a Putty session and it looks like this: ...
3
votes
3answers
2k views

How difficult is it to crack HTTPS? [closed]

I'll be using a computer at a foreign country. Suppose the government is trying to figure out my password, would I be able to protect my password using HTTPS to log into GMail, or my company ...
4
votes
3answers
472 views

Noisy RAM? Or noisy power supply?

I was developing a seekable implementation of AES and when I ran it; a high pitched noise started coming from inside my computer. I know it was NOT the hard drive because there was hardly any hard ...
0
votes
1answer
701 views

How to determine if zip is encrypted by AES

I have to determine encryption method of ZIP files I'm receiving. Mostly I'm interested to know if AES was used or not... Any idea ?
1
vote
2answers
1k views

Which symmetric key algorithm does SSL use?

I understand that thru SSL, the browser gets public key of the secured website and thru public key encryption rsa algorithm, these 2 establish session key and then continue communication thru some ...
3
votes
1answer
4k views

What Algorithm does Microsoft Office 2010 use for Encryption?

Does it use the standard AES 128bit key for encryption? I've searched a lot on Google, but I still haven't found the algorithm is uses for encrypting. I'm encrypting a PowerPoint file.
0
votes
2answers
188 views

Best solution top keep data secure

What is the simplest and most elegant way of storing a small amount of data in a reasonably secure way? I am not looking for ridiculous levels of advanced encryption (AES-256 is more than enough) and ...
2
votes
1answer
810 views

Using openssl command line tool to encrypt/decrypt data, DES ECB

How can I create a random 64 bit key for DEC ECB encryption/decryption, and then use the same key for encryption/decryption many times? All this must be done using openssl command line tool. In all ...
0
votes
1answer
1k views

Decrypting Windows XP encrypted files from an old disk

I had an old Windows XP machine with an encrypted directory. When moving to a new Win7 machine I connected the old disk as a slave in the new machine, and hence cannot access the encrypted files. ...
1
vote
1answer
354 views

Isn't a hidden volume used when encrypting a drive with TrueCrypt detectable?

I don't purport to be an expert on encryption (or even TrueCrypt specifically), but I have used TrueCrypt for a number of years and have found it to be nothing short of invaluable for securing data. ...
0
votes
1answer
167 views

What is the minimum time-period for selecting a new AES?

After how many years submissions are accepted for a new AES? Few months back I heard the news of attacks on AES and it is suggested that AES-128 bit is more secure than AES-256-bit.
1
vote
1answer
2k views

Missing Cryptographic Service on Windows XP Pro SP3

I have a single Windows XP Pro SP3 computer that is having problems installing updates from a WSUS server. The entries in the WindowsUpdate.log point to a problem with the Cryptographic service on ...
3
votes
1answer
748 views

How to force gpg2 to use expired key?

$ gpg -ear XXXXXXX gpg: XXXXXXXX: skipped: unusable public key $ gpg --debug-ignore-expiration -ear XXXXXXXX gpg: Invalid option "--debug-ignore-expiration" How to encrypt? There are no updates for ...
17
votes
3answers
12k views

Can other people on an encrypted Wi-Fi AP see what you're doing?

If you connect to an open, unencrypted Wi-Fi access point, everything you do can be captured by other people within range. If you connect to an encrypted point, then people nearby can intercept what ...
4
votes
3answers
1k views

Decrypt files encrypted with TrueCrypt

I have a usb pen memory crypted with TrueCrypt. Is there a way to decrypt ( without TrueCrypt ) files encrypted with TrueCrypt in linux ?
4
votes
4answers
2k views

What happens if the private key of a Certificate Authority(CA) like Verisign is leaked?

I was just wondering what will happen if the private key of a CA is leaked? Won't it be then possible to make fake certificates for any other website?
18
votes
4answers
37k views

How can I get a list of installed certificates on Windows?

I know I have some certificates installed on my Windows 7 machine, how can I see what they are, the nicknames they are known by, and browse detailed information (such as issuer and available usage)?
2
votes
1answer
614 views

Crypto-Analysis of keylogger logs and config file. Possible?

Is there any way to break the encryption on an unidentified file? The files in question are the config and log files from Ardamax keylogger. These files date back to 2008. I searched everywhere, ...
0
votes
1answer
136 views

Linux cryptography strength outside USA?

Question: The USA forbids the export of secure cryptography. NSAKEY has already been discovered in the Windows cryptograhic API. Since the Linux-Kernel is hosted in the USA, how secure is its ...