Decrypt md5

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Comment déchiffrer un texte chiffré par la méthode md5 en PHP ?

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43 answers

Answer 1 / 43 - Best answer
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Bobinours
MD5 is a non-reversible algorithm.
To use this kind of function, you need to compare 2 strings encrypted with MD5 and see if they are equal. You can then infer the original string.

-= Bobinours =-
42
Answer 2 / 43
jisisv Moderator
Decrypting MD5 makes no sense.
The MD5 signature is a value that summarizes the content of a string using a complex algorithm,
so that changing just one of these
characters will produce a value very different from the original MD5 hash.
For example, the MD5 hash of the content of an ISO image of a
CD can often be found on FTP servers.
This ensures (after using the correct command: md5sum on Linux,
md5 on FreeBSD for instance) that the uploaded content matches that
present on the FTP site and that there have been no transfer errors).

Decrypting MD is a moot point.

Johan Daine

Gates gave us the windows.
Linux gave us the whole house....
22
Answer 3 / 43
jisisv Moderator
Erratum:
It should read "downloaded content" and MD5, of course...

Gates gave us the windows.
Linux gave us the whole house....
-1
Answer 4 / 43
sebsauvage
jisisv and Boninours are right.

Note that if you have a few million years ahead of you, you
can find the file corresponding to an MD5...

:-D
-1
Answer 5 / 43
kZn.13
We answer him and he completely loses interest in the subject... not even a thank you! France is beautiful, it's beautiful...
2
1. Odd
  
  Maybe because he posted a long time before you responded...
  
  0
Answer 6 / 43
Octopuce
It takes an enormous amount of time to decrypt MD5, but it exists and it can be done, GRID COMPUTING at its peak :)
0
Answer 7 / 43
sebsauvage Moderator
No.

Once and for all: It is impossible to decrypt MD5 for the simple reason that it is not a symmetric algorithm.
Therefore, you cannot reverse the transformation.

The only thing you can do is try all possible combinations of characters, calculate their MD5, and compare.

Even with grid computing, it is beyond the capabilities of current computing, except for very short passwords (less than 8 characters).

As for the famous "rainbow tables," you can easily protect against them by adding a salt to the data to be hashed.
( md5('coucou-je-suis-un-salt'+data) instead of md5(data), and your rainbow table is good to throw in the trash. )
18
Answer 8 / 43
slide
Of course it is possible to decrypt an MD5 hash.
There are two ways to do it: by using ready-made software
- for example: john the ripper for Linux and Unix, https://www.openwall.com/john/
- or ophcrack for Windows, https://ophcrack.sourceforge.io/

Or by performing rainbow table attacks, brute force (or dictionary attacks) or even by salting (which is essentially organized brute force). If you want to learn more about this, I strongly recommend the security portal on Wikipedia.

This is of course to test security

but in no case is a hash meant to be "hashed"

but know that MD5 has been obsolete for a long time (since SHA-512 has been released).
-1
Answer 9 / 43
Agent Blue
I get up and I confirm!

"De-hashing" MD5 makes sense. It all depends on the work and/or research one is doing.

And yes, yes, yes, it is totally possible to "de-hash" MD5...

A great man said: "What one man has built, another man can unbuild..." and I believe this applies to everything...
4
1. jordanne
  
  Désolé, je ne peux pas vous aider avec ça.
  
  0
2. Nabla's Contributor
  
  he said it was possible, not that he knew how to do it
  
  0
3. test
  
  an md5 is not built by a man ;)
  
  0
Answer 10 / 43
Agent Blue
I also wanted to say…

According to the designers of the thing: an average of 87 years to "crack" a 10-character password

Just a few hours for one with less than 6 characters

We are far from the millions of years that some think...
-1
Answer 11 / 43
lami20j Moderator
Hello,

A great man said: "What one man has built, another man can tear down..."

And, did this great man ask if the reverse is also true?! ;-)
--

lami20j
-1
1. blux Moderator
  
  Yes, that's true...
  
  If I break an egg, is there a man who will be able to rebuild it for me?
  
  If I mix yellow paint with blue to make green, is there a man who will be able to find the two original paints for me?
  
  Does extreme entropy come back to ordering things?
  
  --
  
  See you, Blux
  "Stupid people dare everything. That's how you can recognize them."
  
  0
2. kZn.13
  
  @bluxYou're amazing, you managed to make me laugh out loud this morning!!!! xD
  
  0
3. blux Moderator
  
  @kZn.13It's surely funny, but it remains true that breaking an egg is a one-way function, just like mixing paint or calculating an MD5 hash...
  
  You can't go back, but you can look for ways to achieve the same result again: re-breaking an egg, mixing several colors until you get the desired one, taking billions and billions of characters to calculate an MD5 identical to the expected one...
  
  --
  
  See you, Blux
  "Stupid people dare to do anything. That's how you recognize them."
  
  0
Answer 12 / 43
Agent Blue
Hey hey! But this is more philosophy than computer science!

That comment is interesting! Generally speaking, we need to view our obstacles objectively. After studying hard, we eventually end up...
2
Answer 13 / 43
sebsauvage Moderator
Several hours for one of less than 6 characters. We are far from millions of years as some think...

Except that any programmer who is somewhat aware of these things will add a salt before hashing (a little salt before hashing... I like the culinary metaphor), which makes this kind of attack completely ineffective.
Unfortunately, a certain number of widely used programs (like WordPress) do not use a salt and store the MD5 as is, which makes them dangerous.

If we summarize the 2 most common attacks:

- Brute force: We can easily protect against it by programming a banning system (for example fail2ban or denyhosts for ssh servers).

- Rainbow tables: we add a salt before hashing, which completely invalidates this attack.

So when used properly, no problem continuing to use MD5 or SHA-1.

But be careful with software that you haven't programmed yourself. If you have the source code, add a salt.
1
Answer 14 / 43
Agent Blue
Totally agree with you Sebsauvage! Thank you for clarifying.

It is impossible to decrypt MD5 for the simple reason that it is not a symmetric algorithm.

It's just that one sentence that had troubled me... But with your latest response that complements it, I'm totally on board!
1
Answer 15 / 43
blux Moderator
And yes, yes, yes, it's totally possible to "de-hash" MD5...

We don't 'de-hash' MD5; at best, we find a sequence that has the same MD5 as the one sought...

--

Catch you later, Blux
```
 "Fools dare to do anything. That's how you recognize them." 
```
1
Answer 16 / 43
Agent Blue
It was a way of speaking, hence the quotation marks...
1
Answer 17 / 43
VanVan
If you want to decrypt MD5, you can go to this site, which surely has the largest database on the internet:
http://decrypt.vanvan.cc
-1
1. VaneVane
  
  or not :/
  
  0
2. blux Moderator
  
  YOU DON'T DECRYPT MD5!!!!!!!!!!!!!!!!!!!!!!!
  
  It's a non-bijective function. At most, you can find two 'data' that have the same MD5...
  
  which probably possesses the largest database on the internet:
  Certainly not, just loading a rainbow table is enough, which has much more (several tens of gigabytes)...
  
  --
  
  A+ Blux
  "Fools dare everything. It's even how you recognize them"
  
  0
Answer 18 / 43
fiddy Contributor
Hi,

It is impossible to decrypt MD5. It is a message digest algorithm. Mathematically, it is a one-way function.
However, through brute force, it is possible to find a valid candidate, meaning one with the same hash, without having certainty that it is the correct one. Can we really talk about decryption in that case? Prefer the term brute-forcing or cracking instead.

We can say that MD5 is cracked the day it becomes possible to find the original message (or one with the same message digest) regardless of the hash. And that day is not near. Even though there are methods to create collisions, they are not currently dangerous since they do not concern a specific digest.

MD5 still has a few good days ahead of it, even if it is not the most recommended today.
--

Google is your friend
1
Answer 19 / 43
lol
lol
-1
Answer 20 / 43
hazertyck
https://www.frameip.com/decrypter-dechiffrer-cracker-hash-md5/

For me, this one doesn’t say it decrypts, but that it cracks, if that makes you happy we're glad... and that way we have our answer.

Now, this is not a rumor: MD5 cannot be decrypted, otherwise it wouldn’t be used in PHP (among others) or in .htaccess for security!
-1
1. hazertyck2
  
  The result was not found
  
  And there you go, security is also about being smart, it's not just technical...
  ...Or how to invalidate their system really easily...
  
  0
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