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

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Looking for new way to create password [on hold]

I tend to use same 2-3 passwords for all sites and want to change that but want to make sure I standardize my new approach as well. Looking at password hashing and I know very little other than what ...
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1answer
50 views

GnuPG / OpenGPG: Recovering public key from private key

I know that the public SSH key can be recovered from the private using ssh-keygen -y. How can a (deleted) public key be recovered from the private key in GPG (preferably in a way that is OpenGPG ...
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40 views

Can I use a “Microsoft Office” Digital ID / certificate to sign PDFs in Adobe Acrobat?

I've been needing to sign PDFs lately - fortunately everyone's been fine with me using a self-signed certificate, however I feel it's unprofessional. I'm looking for a personal certificate I can use ...
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2answers
59 views

gpg2 - no option to select aes block cipher and outdated use agent?

With OpenSSL, I can select a what type of block cipher to use for encrypting a file. For example, if I want to encrypt a file with AES256 CBC block cipher mode: openssl aes-256-cbc -a -salt -pass ...
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0answers
20 views

Viewing and listing keys in MSCAPI CSP containers

I have a MSCAPI container created and hosted within a Windows Server 2003 environment. How do I use the command line to list keys and their details within the container onto the command line ?
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18 views

gpg keyserver duplicates signatures on my key

I created a new GPG key (rsa + rsa subkey), let's call it key1, and uploaded it to the keyserver. It has two uids. Later I signed this new key with another key (let's call it key2), and uploaded the ...
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1answer
66 views

Recover the ISPConfig 3 passwords

I have a backup of the old ISPConfig database. There are tons of email accounts and their aliases. I need to add them manually to the newer version of ISPConfig (this database is not compatible with ...
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1answer
101 views

Is it possible to stream live audio/video safe from duplication/copying?

What I'd like to do is play an audio file exactly once and then it should not be possible to play it again. Is there such a file format or function? The scenarios I had was 1) Some famous music group ...
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2answers
187 views

Generate a public key certificate signed by CA with OpenSSL

I am working on a webservice that requires a signature in the sent and received messages. After sending a certificate request to the entity that will consume the webservice, they sent me (in addition ...
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1answer
471 views

How to get system-wide use of Intel's AES-NI acceleration with OpenSSL 0.9.8?

I found the following instructions to get Intel's contrib OpenSSL 0.9.8 engine code on some Westmere-based systems that we have: $ wget https://www.openssl.org/contrib/intel-accel-1.5.tar.gz $ tar ...
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47 views

CryptoLocker Ransomware. Can you recover files? [duplicate]

Today one of our PCs got infected with nasty CryptoLocker trojan crap. The PC was a Windows XP machine with up-to-date NOD32 a/v. As you probably know the virus encrypts your file with an 2048 bit ...
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31 views

How to change cryptography method at TLS protocol on Localhost(XAMPP)?

How do I change the cryptography method at SSL/TLS protocol on Localhost(XAMPP)? I want to use Blowfish as symmetric cypher, and RSA for PKC....
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219 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 ...
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1answer
827 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 ...
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2answers
62 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?
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39 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 ...
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3answers
282 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 ...
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2answers
51 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 ...
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1answer
2k 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/ ...
3
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1answer
4k 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 ...
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251 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 ...
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3answers
628 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 ...
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1k 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, ...
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3answers
83 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 ...
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1answer
804 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 ...
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2answers
6k 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 ...
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1answer
850 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 ...
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1answer
88 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 ...
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2answers
527 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 ...
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1answer
419 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 ...
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818 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 ...
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1answer
244 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. ...
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1answer
348 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 ...
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1answer
270 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 ...
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37 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 ...
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1answer
229 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 ...
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2answers
323 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 ...
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1answer
620 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 ...
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3answers
778 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 ...
3
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2answers
3k 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
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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 ...
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3answers
561 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 ...
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1answer
1k 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 ?
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2answers
2k 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 ...
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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.
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195 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
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1answer
913 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 ...
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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. ...
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375 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. ...
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174 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.