i've got some serious problems creating a hash for the /etc/shadow. I try to understand how linux creates this hash. Till now i understood that the $6$ shows me that my ubuntu 9.10 uses sha512 to create the hash. I also understood that the "salt"-thing makes the whole think much more secure, but can someone please explain how the WHOLE thing works? Is the hash created only out of the password or password and username? And, if it uses the password and username, in which order are they used? Hope someone could help
---------- Post updated at 09:24 AM ---------- Previous update was at 08:16 AM ----------
Hello again,
maybe my problem is not totally clear. If I, do this
Code:
sudo adduser ralph
and choose "hello" as the password, the entry in the /etc/shadow looks like this
Hi,
I am new to shell programming and trying to write a command that would show the etc/shadow file but without the hashes. So, something like this:
root: <HASH PASSWORD FOUND BUT OBFUSCATED>
daemon: NP
bin: NP
sys: NP
If there is a... (2 Replies)
I have a script with dynamic hash of hashes , and I want to print the entire hash (with all other hashes).
Itried to do it recursively by checking if the current key is a hash and if yes call the current function again with refference to the sub hash.
Most of the printing seems to be OK but in... (1 Reply)
Hello,
I want to know the reason behing the scene why some systems have hashed password in /etc/shadow file as "x" not the alienoid language like A1Dksxi3kaA.. (13 characters)
As far as I understand, etc/password will show password as "x" and move all hashed password to etc/shadow.... (8 Replies)
Hello,
I have a hash in hsh. I need to assign it to another hash globalHsh. I think the below statement does not work
$globalHsh{$id} = %hsh;
What is the right way to assign it?
Thanks (3 Replies)
Can Someone explain me why even using Tie::IxHash I can not get the output data in the same order that it was inserted? See code below.
#!/usr/bin/perl
use warnings;
use Tie::IxHash;
use strict;
tie (my %programs, "Tie::IxHash");
while (my $line = <DATA>) {
chomp $line;
my(... (1 Reply)
Hi,
In Perl, is it possible to use a range of numbers with '..' as a key in a hash?
Something in like:
%hash = (
'768..1536' => '1G',
'1537..2560' => '2G'
);
That is, the range operation is evaluated, and all members of the range are... (3 Replies)
I am trying to use John the Ripper but it doesn't take regular MD5 hashes, only shadow MD5 hashes. For example this hash: 900150983cd24fb0d6963f7d28e17f72 (which, decrypted, is 'abc') within a text file, John the Ripper does not detect because it is not in shadow format. How can I convert this MD5... (2 Replies)
Hi,
I have an hashes of hash, where hash is dynamic, it can be n number of hash. i need to compare data_count values of all .
my %result (
$abc => {
'data_count' => '10',
'ID' => 'ABC122',
}
$def => {
'data_count' => '20',
'ID' => 'defASe',
... (1 Reply)
Hi, I have a hash of hash where it has
name, activities and count
i have data like this -
$result->{$name}->{$activities} = $value;
content of that are -
name - robert tom cat peter
activities - running, eating, sleeping , drinking, work
i need to print output as below
... (3 Replies)
Discussion started by: asak
3 Replies
LEARN ABOUT PHP
uuidgen
UUIDGEN(1) User Commands UUIDGEN(1)NAME
uuidgen - create a new UUID value
SYNOPSIS
uuidgen [options]
DESCRIPTION
The uuidgen program creates (and prints) a new universally unique identifier (UUID) using the libuuid(3) library. The new UUID can reason-
ably be considered unique among all UUIDs created on the local system, and among UUIDs created on other systems in the past and in the
future.
There are three types of UUIDs which uuidgen can generate: time-based UUIDs, random-based UUIDs, and hash-based UUIDs. By default uuidgen
will generate a random-based UUID if a high-quality random number generator is present. Otherwise, it will choose a time-based UUID. It
is possible to force the generation of one of these first two UUID types by using the --random or --time options.
The third type of UUID is generated with the --md5 or --sha1 options, followed by --namespace namespace and --name name. The namespace may
either be a well-known UUID, or else an alias to one of the well-known UUIDs defined in RFC 4122, that is @dns, @url, @oid, or @x500. The
name is an arbitrary string value. The generated UUID is the digest of the concatentation of the namespace UUID and the name value, hashed
with the MD5 or SHA1 algorithms. It is, therefore, a predictable value which may be useful when UUIDs are being used as handles or nonces
for more complex values or values which shouldn't be disclosed directly. See the RFC for more information.
OPTIONS -r, --random
Generate a random-based UUID. This method creates a UUID consisting mostly of random bits. It requires that the operating system
have a high quality random number generator, such as /dev/random.
-t, --time
Generate a time-based UUID. This method creates a UUID based on the system clock plus the system's ethernet hardware address, if
present.
-h, --help
Display help text and exit.
-V, --version
Display version information and exit.
-m, --md5
Use MD5 as the hash algorithm.
-s, --sha1
Use SHA1 as the hash algorith.
-n, --namespace namespace
Generate the hash with the namespace prefix. The namespace is UUID, or '@ns' where "ns" is well-known predefined UUID addressed by
namespace name (see above).
-N, --name name
Generate the hash of the name.
-x, --hex
Interpret name name as a hexidecimal string.
CONFORMING TO
OSF DCE 1.1
EXAMPLES
uuidgen --sha1 --namespace @dns --name "www.example.com"
AUTHOR
uuidgen was written by Andreas Dilger for libuuid.
SEE ALSO libuuid(3), RFC 4122
AVAILABILITY
The uuidgen command is part of the util-linux package and is available from https://www.kernel.org/pub/linux/utils/util-linux/.
util-linux June 2011 UUIDGEN(1)
01-18-2010
