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14
votes
5answers
3k views

Why is MD5 still used heavily?

MD5 seems to have well documented vulnerabilities and yet it remains widespread in its usage. Does anyone have any reasons for it remaining a viable option when other alternatives (e.g. SHA-2) seem to ...
14
votes
1answer
211k views

How do I recover the password of a RAR file on Mac OS X?

I'm running Mac OS X 10.6.2 and have been handed a couple of old files that need to be extracted. Old backups or finances or bills I believe. They are RAR files, and password protected. Is there a way ...
11
votes
5answers
1k views

File checksum calculator for Windows [closed]

I'm looking for a light, fast hash/checksum calculator (eg. MD5, SHA1, etc.). I've been using HashCalc and it works fine enough, but I was wondering if there was something better. When downloading ...
9
votes
1answer
526 views

Which file system automatically stores hashes of files?

Which file system automatically computes and stores hashes of files and later checks them at access to detect corruption?
8
votes
3answers
1k views

md5: Why is my command-line hash different from online md5 hash results?

On Mac OSX Leopard PowerPC, if I do: echo "hello" | md5 on the command line, the result is: b1946ac92492d2347c6235b4d2611184But if I enter hello into one of the online md5 hash sites like ...
8
votes
2answers
604 views

MD5 and SHA1 checksum uses for downloading

I notice that when downloading a lot of open source tools (Eclipse, etc.) there are links for MD5 and SHA1 checksums, and didn't know what these were or what their purpose was. I know these are ...
7
votes
4answers
14k views

Is there an Excel function to create a hash value?

I'm working with a number of data lists that are keyed by document name. The document names, while very descriptive, are quite cumbersome if I need to view them on (up to 256 bytes is a lot of real ...
5
votes
3answers
443 views

Why does sha1sum act differently with the same input?

I'm trying to replicate the behavior of the sha1sum executable in some java code, however, in the process I've discovered that sha1sum appears to behave differently given the same input in two ...
5
votes
2answers
484 views

How can zero byte files generate a hash value?

How can a zero byte text file generate a hash when hashed with sha1sum, sha256sum etc? What data are the programs hashing to generate a hash value? Ta
5
votes
3answers
1k views

Best Way to Archive Digital Photos and Avoid Duplicate File Names

This problem pertains to archiving of digital pictures taken from multiple cameras. Answers here covered the general topic of the-mechanics-of-backups: How do you archive digital photos and ...
5
votes
2answers
277 views

Calculating sha256sum of a dvd

I have a burnt dvd from an iso image. I have also sha256sum of the iso image. to compare hashes, I created an iso image from the dvd and executed sha256sum image.iso, but it differs from the hash of ...
5
votes
3answers
720 views

Tool for getting a complete directory/file listing with detailed information including hash(es)

Once in a while, I take a complete snapshot of my drives with a command like the following. > for %i in (%drives_hd%) do @dir %i:\/s/a/o>>File_List.txt This gives detailed information ...
5
votes
1answer
2k views

enabling LM hash in Windows 7

Is there any way to enable/convert an NTLM hash for a user account on Windows 7 to a LM hash? I know it's not secure, but I am trying to test something. Is it even possible?
4
votes
4answers
2k views

OpenSSL hash function for generating AES key

What hash function does OpenSSL use to generate a key for AES-256? I can't find it anywhere in their documentation. $ touch file $ openssl aes-256-cbc -nosalt -P -in file enter aes-256-cbc ...
4
votes
3answers
544 views

How secure is it to use a password hash of a common English word as a WPA2 key?

I have a wireless router, and I want a difficult password that is still, in a way, easy to remember. I came up with this idea to take the MD5, SHA-1, SHA-256, or whatever hash of a common English ...
4
votes
1answer
128 views

What files from the /boot partition, in addition to the MBR, must be hashed in order to detect an “evil maid” attack against LUKS-encrypted Linux?

Are boot.img, initrd, and vmlinuz adequate or should the entire contents be hashed? I am not familiar enough with the Linux boot process to answer this with confidence myself.
3
votes
1answer
1k 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
votes
1answer
728 views

How to check file against a hash on windows 7?

How to check downloaded file against its hash (SHA-256 Hash, SHA-1 Hash, MD5 Hash) on windows?
3
votes
3answers
2k views

How to check for duplicate files?

I have an external hard drive on which I have backed up files several times. Some files were modified between backups, others were not. Some may have been renamed. Now I'm running out of space, and ...
3
votes
1answer
45 views

Any examples of duplicate MD5 Hashes?

I was wondering, as it is theoretically possible to have duplicate MD5 hashes, are there any known examples of this, or is it all just theoretical?
3
votes
1answer
3k views

What is the fastest MD5 sum calculator?

I tested the speed of md5sum on a few Ubuntu 8.04 servers Pentium III 700 MHz: 52 MB/s Atom 1.6 GHz, 32-bit: 119 MB/s Core 2 (Yorkfield) 2.5GHz, 32-bit: 194 MB/s Core 2 (Yorkfield) 2.5GHz, 64-bit: ...
3
votes
0answers
27 views

Embedding index in pdf files [closed]

Are there any (free) tools for building an index of a pdf and embedding it in the file in order to speed up searching? I know Acrobat Pro has a catalog option but I was hoping for a free tool and ...
2
votes
1answer
565 views

Is the linux md5 password hashing considered secure?

On my RHEL6 linux is configured to use MD5 password hashing is the linux usage of MD5 for password hashing considered secure?
2
votes
1answer
749 views

Compute salt with known plaintext and hash?

I have the string that was used in a webapp with md5 hashing to come up with a hash. I also have the hash. But the md5 of the string doesn't match the hash, so I'm guessing there's a salt involved. Is ...
2
votes
1answer
757 views

QR Codes for Files on Google Code

When you download files from Google Code now (example), in addition to the text version of the SHA1 hash, it includes a QR code of it. The device that the file was downloaded to is the one that has ...
1
vote
3answers
2k views

sha1sum for a directory of directories

sha1sum ./path/to/directory/* | sha1sum the above was posted as a way to compute a sha1sum of a directory which contains files. This command fails if the directory includes more directories. Is ...
1
vote
3answers
225 views

Current alternative to the old CHECKSUM program

I'm looking for an application that does md5/sha hash check on specific files/folders periodically and store an index file per folder for future verification. I remember such application exist in DOS ...
1
vote
2answers
332 views

Why is an internal table of PATH directories maintained?

I was looking for what rehash command does and found this: The rehash command re-computes the internal hash table of the contents of directories listed in the path environmental variable to ...
1
vote
2answers
2k views

Is there a way to detect encryption used on a file?

I have a small file that is encrypted and I want to see if it is a encryption method that has been broken or cracked.
1
vote
1answer
41 views

How does applications read my hashed passwords?

mpdas (last.fm scrobbler for mpd) forces one to write password hashed in md5. But if it's hashed, how does it login to last.fm? Isn't hash function one-way only?
1
vote
3answers
2k views

md5sum of files in two folders

I'm trying to compare all the files in two folders via an md5sum in one command. Some like the following (bash) in Debian: $ cd ~/FOLDER1 $ md5sum ~/FOLDER2/* | md5sum -c - The idea is that the ...
1
vote
3answers
2k views

How to add hash to MS Word documents?

I'd like to add a SHA, or some other kind of a hash to a Word (for Windows) document. Is there a good program / macro that would help me with that? Or some kind of a tutorial somewhere on the net? ...
1
vote
1answer
267 views

Where can I find hashes for Mozilla applications?

What is a reliable source for cryptographic hash values for Mozilla applications? Update 1: the value from http://releases.mozilla.org/pub/mozilla.org/thunderbird/releases/latest/MD5SUMS, ...
1
vote
3answers
51 views

How can SHA512 make a long string into a short string

I´m wondering how this random and very long string €£$€@]}$€{[$£}]£[€€£$€@]}$€{[$£}]£[€]}€486745896€$@fdhhsgpbkjhYUVYUDTYhµµµ½789ty45thhrhYUFVYU7645646f8cgI JKHVruxty dw78fg f 9w64f ...
1
vote
1answer
185 views

How to make sure a downloaded .iso matches a hash value?

I have download the .iso file as guided here and there is part that says to verify the downloaded .iso with CRC or SHA-1 hash value. Make sure that the CRC and SHA1 hash values of the downloaded ...
1
vote
2answers
62 views

Is there a way to search for files by hash value?

Is there a way I can have a hash value as input when searching for files and a complete list of files and their locations as output? This could be helpful when trying to pin point file duplicates. I ...
1
vote
2answers
273 views

Obtain SHA256 Value for Subject Key Identifier

Using Keytool we can view the details of a Keystore with the command keytool -list -v -keystore <KeystoreName> This returns a set of values including a Subject Key Identifer ...
1
vote
0answers
121 views

hash-based asyncronous directory comparison

I am trying to efficiently synchronize two large directories via VPN over a long distance. Unfortunately I cannot install advanced tools like git or rsync on the remote server due to company ...
1
vote
0answers
656 views

How to verify 7zip'd files integrity

For some files I have compressed, I have been looking for a MD5 add-on to 7zip (As I have the MD5's by way of an Explorer Column Handler, in xplorer2); or a CRC Explorer Column Handler (Because 7Zip ...
1
vote
1answer
31 views

Is it possible to store Hashed data in a different field than userPassword in LDAP

I've been asked to store hashed data in a LDAP server. Putting hashed passwords is easy but I'm not sure if LDAP allows to store data like email hashed or even encrypted. Creating a LDIF file with a ...
0
votes
5answers
5k views

Is it possible to decrypt MD5 Hashing? [closed]

I was seeing a video on how to hash passwords with MD5 Hashing. After googling on it I found out that Facebook also uses MD5 hashing scheme. Now I was curious to know if we can decrypt the password ...
0
votes
4answers
4k views

Can you use OpenSSL to generate an md5 or sha hash on a directory of files?

I'm interested in storing an indicator of file / directory integrity between two archived copies of directories. It's around 1TB of data stored recursively on hard drives. Is there a way using ...
0
votes
1answer
156 views

How do you make multiple computers work on the same task? (hash cracking)

This is a question that's been plaguing me since I saw the following YouTube video: http://www.youtube.com/watch?v=TBXBB5sy5sA This man installed 20 video cards across 5 different rigs, all running ...
0
votes
1answer
23 views

Adding peers from another torrent with different hash values

I found two exact torrent files (same in size) with two different hash values. Since the contents of the files were the same and the number of seeds was very less, I thought that I could connect the ...
0
votes
2answers
84 views

2 users that have the same passwords on windows 7. will the hashes in the SAM file be the same?

Let's say I have a computer with win7 and I made 2 different accounts. Now I've set the same password for both accounts. My question is whether the hashes of the passwords in the SAM file will be ...
0
votes
1answer
112 views

Is it possible to write an app that ignores the zip archive password?

I am not sure how password protected archives work but is it the programs enforcing the protection or is it the way the format works where if it's password protected, there is no way to extract the ...
0
votes
2answers
5k views

Strongest Encryption and Hashing Algorithms Today [closed]

Basically, I want to know what the strongest (hardest to break) encryption algorithm today is. The same goes for the hashing algorithm. Let's say I pick a super-strong password too (bonus: how long ...
0
votes
2answers
1k views

How to download a file properly with a proper hash check? [duplicate]

Possible Duplicate: EXE file package repair I'm trying to download the Oracle VM with Enterprise Linux and database tools from here. It's an appliance that can be imported with VirtualBox ...
0
votes
1answer
26 views

Restore Partiton only on change

I have wrote a script that restores a partition from a previous made dd dump. Basically it calls this line: dd if=stored_image.img of=/dev/sdb1 bs=1M The restore for this takes about 5 Minutes ...
0
votes
1answer
16 views

How can a user login to a workstation if the DC is down?

Is it possible to do such thing? Because the hash of that users' password is normally stored on the DC.. And if it is, where are the users credentials stored on that workstation?