Server Fault
Server Fault

Questions tagged [md5]

MD5 message-digest algorithm is a cryptographic hash function producing a 128-bit hash value. MD5 was designed by Ronald Rivest in 1991. In the 1990s, MD5 and DES were some of the only encryption technology options available for US companies to create "export grade" (deliberately weakened) encryption. The restrictions were relaxed in 2000.

47 questions
72
votes
20 answers

How to create an SHA-512 hashed password for shadow?

The previous SF questions I've seen have lead to answers that produce MD5 hashed password. Does anyone have a suggestion on to produce an SHA-512 hashed password? I'd prefer a one liner instead of a script but, if a script is the only solution,…
Belmin Fernandez
  • 11,039
  • 28
  • 89
  • 150
33
votes
10 answers

Calculate MD5 checksum of a directory

I'm looking for a quick way to compare directory contents. Is it possible to do an md5sum (or equivalent checksum) of an entire directory? Using Ubuntu Linux
pufferfish
  • 3,012
22
votes
2 answers

Why are md5 passwords hashed differently?

I've been wondering for a while, why does running "echo 'helloworld' | openssl passwd -1 -stdin" yield different results every time?If I put any of the hashes in my /etc/shadow I can use them as my password and login to my system, how does it…
Peter
  • 1,102
19
votes
4 answers

Different md5sums for same tar contents

I run a test creating two tars from the same dir (its files remained unchanged), and I found that their md5sums were different. I assume there's some timestamp being included in the tar's header, but I haven't found the way to override it. My OS is…
xain
  • 697
11
votes
3 answers

Windows 2012 R2 - Search for Files using MD5 Hash?

My organization recently discovered malware that was sent to some users via email that managed to get past our email security in a sophisticated, targeted attack. The names of the files vary from user to user but we have collected a list of the…
Brandon Wetter
  • 221
10
votes
3 answers

vsftpd will not accept passwords encrypted with MD5

I am setting up an server with vsftpd to let virtual users access their space. Now it is fully working but only with CRYPT passwords. So sudo htpasswd -c /etc/vsftpd/ftpd.passwd phpmyadmin will not allow me to log in, but sudo htpasswd -c -d…
Marco
  • 307
8
votes
1 answer

Securing NTP: which method to use?

Can someone good at NTP configuration please share which method is the best/easiest to implement a secure, tamper-proof version of NTP? Here are some difficulties... I don't have the luxury of having my own stratum 0 time source, so must rely on…
Harry
  • 473
7
votes
1 answer

Does AWS cli do a data integrity check on sync with s3?

I've been looking into using AWS cli for data integrity checks to verify a backup has been transferred from a Linux file server correctly to AWS s3. Likewise, I would like to verify when restoring a file from backup to the Linux file server it also…
Edward_178118
  • 1,025
6
votes
1 answer

LDAP passwords encryption (userPassword attribute)

I'm trying to import passwords from an LDAP to a MySQL database. When I look at the userPassword attribute for the known password test I get this: userPassword:: e01ENX1DWTlyelVZaDAzUEszazZESmllMDlnPT0= The password at this stage is base64 encoded,…
Max Corbeau
  • 3,653
5
votes
5 answers

md5sum of large files gives different results sometimes

I have an AMD quad core, 8 gb RAM, 1 SSD EXT2 (2 months old), 2 HDD EXT4, approximately 1 year old. I'm using Ubuntu 10.04 x86-64 and when I compute the md5sum of large files (9 GB) sometimes I get different values than the one stored on a reference…
Emanuele
  • 203
5
votes
4 answers

Is it secure to encrypt my POST variables to md5 before sending them?

I have a simple login form where a user enters their username and password. When php receives the vars via POST, it encrypts the password to md5, then compares it with the database records. My question is: would it be more secure to encrypt the…
Mickwaffle
  • 51
4
votes
2 answers

Different md5sum on 2 NFS clients

2 machines are mounting the same NFS folder(which is on a single 3rd machine). Files get uploaded from either client server to this mount, usually in chunks. Server A might handle a chunk, then server B the next, all with start and end points…
KdgDev
  • 343
4
votes
3 answers

Can I force the passwd command to use MD5 hash (and not crypt)?

How can I force the passwd command to use MD5 hash and not to use crypt? I need to get the passwd command to talk to the ldap server (which it does) and use MD5 when I change passwords for the users.
MyOnlyEye
  • 135
4
votes
2 answers

Can "tar" backup incrementally?

I have my home folder with a few GB. Is it possible to run tar on it, create a home.tar.gz, and then for changed files, it creates home1.tar.gz only with modified files from previous tar (thus being an incremental backup)? I would like to check the…
Somebody still uses you MS-DOS
  • 295
  • 1
  • 4
  • 13
3
votes
2 answers

changing shadow hash algorithm to bcrypt: how to rehash

I want to change my SHA512 shadow file to use bcrypt as shown in this question/answer: Enable blowfish-based hash support for crypt The problem is that i run into a chicken and egg problem, because the existing shadow-file is SHA512 encrypted, which…
Fabian Zeindl
  • 239
  • 1
  • 3
  • 10
1
2 3 4