Re: [fpc-pascal] MD5 decryption?

[Michael Schnell]

On 12/11/2013 05:54 PM, silvioprog wrote:


Go to: http://md5decryption.com 
In "Please input the MD5 hash that you would like to be decrypted:" 
field, put: 7db4a8dae498d1b4686ebd1f79326602

See the result in "Decrypted Text:" field.




Nice !

So you obviously can compress the bible in 32 hex numbers.

Is this patented ?

-Michael
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Re: [fpc-pascal] MD5 decryption?

[silvioprog]

2013/12/11 Ewald 

>  Once upon a time, silvioprog said:
>
>  2013/12/11 Ewald 
>
>  Go to: http://md5decryption.com
> In "Please input the MD5 hash that you would like to be decrypted:" field,
> put: 7db4a8dae498d1b4686ebd1f79326602
> See the result in "Decrypted Text:" field.
>
> Yes, I've seen the  site, what they probably do is a reverse lookup in a
> table, but it cannot be called `decryption`. Encryption is two way: an
> output can be converted back to the original input. This is not the case
> with a hashing function. Take for example a very simple function that xor's
> all input bytes together (with MD5 it boils down to the same, albeit a bit
> more complex). If I give you the output $F0, how do you know what was the
> original input? The answer is you don't. It could be [$80 $70] as well as
> it could have been [$C0 $FF $30 $FF]...
>
> While both algorithm types (encryption and hashing) are related (the above
> xor example classified as a checksum, whereas xor encryption also exists),
> they are definitly not the same.
>
> --
> Ewald
>
>
Nice explanation, thanks! (y)

-- 
Silvio Clécio
My public projects - github.com/silvioprog
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Re: [fpc-pascal] MD5 decryption?

[Ewald]

Once upon a time, Michael Van Canneyt said:
>
> You should read the description.
> They look in a database. They don't do actual decryption.

Euhm... Forget about my last reply to this mail (the one with the
bicycle and the car), my brain read something different there. Sorry for
the noise.

-- 
Ewald

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Re: [fpc-pascal] MD5 decryption?

[Ewald]

Once upon a time, Michael Van Canneyt said:
>
> You should read the description.
> They look in a database. They don't do actual decryption.

Yep, that's what I did, I even looked at the little line advertising how
much records they had in their database. Most unfortunately though it
cannot be called decryption. If I would advertise a bicycle as a car to
you there would also be some confusion don't you think :-)

-- 
Ewald

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Re: [fpc-pascal] MD5 decryption?

[Ewald]

Once upon a time, silvioprog said:
> 2013/12/11 Ewald mailto:ew...@yellowcouch.org>>
>
> Go to: http://md5decryption.com 
> In "Please input the MD5 hash that you would like to be decrypted:"
> field, put: 7db4a8dae498d1b4686ebd1f79326602
> See the result in "Decrypted Text:" field.
Yes, I've seen the  site, what they probably do is a reverse lookup in a
table, but it cannot be called `decryption`. Encryption is two way: an
output can be converted back to the original input. This is not the case
with a hashing function. Take for example a very simple function that
xor's all input bytes together (with MD5 it boils down to the same,
albeit a bit more complex). If I give you the output $F0, how do you
know what was the original input? The answer is you don't. It could be
[$80 $70] as well as it could have been [$C0 $FF $30 $FF]...

While both algorithm types (encryption and hashing) are related (the
above xor example classified as a checksum, whereas xor encryption also
exists), they are definitly not the same.

-- 
Ewald

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Re: [fpc-pascal] MD5 decryption?

[silvioprog]

2013/12/11 Michael Van Canneyt 
>
>
> On Wed, 11 Dec 2013, silvioprog wrote:
>
>  2013/12/11 Ewald 
>>   Once upon a time, silvioprog said:
>>   > Hello,
>>   >
>>   > How to decrypt a MD5 in FPC?:
>> MD5 is a hashing algorithm, not an encryption algorithm. There is more
>> than one input for this algorithm which will generate the same hash, as
>> opposed to a cipher.
>>
>> --
>> Ewald
>>
>>
>> Go to: http://md5decryption.com
>> In "Please input the MD5 hash that you would like to be decrypted:"
>> field, put: 7db4a8dae498d1b4686ebd1f79326602
>> See the result in "Decrypted Text:" field.
>>
>
> You should read the description.
> They look in a database. They don't do actual decryption.
>
> Michael.


Ah ha... I haven't seen this detail. xD

Phew, I was thinking it would be possible to know the hidden text in a hash.

-- 
Silvio Clécio
My public projects - github.com/silvioprog
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Re: [fpc-pascal] MD5 decryption?

[Sven Barth]

Am 11.12.2013 17:54, schrieb silvioprog:

2013/12/11 Ewald mailto:ew...@yellowcouch.org>>

Once upon a time, silvioprog said:
> Hello,
>
> How to decrypt a MD5 in FPC?:
MD5 is a hashing algorithm, not an encryption algorithm. There is more
than one input for this algorithm which will generate the same
hash, as
opposed to a cipher.

--
Ewald


Go to: http://md5decryption.com 
In "Please input the MD5 hash that you would like to be decrypted:" 
field, put: 7db4a8dae498d1b4686ebd1f79326602

See the result in "Decrypted Text:" field.

Please read what they write on their web page (stresses by me):

=== quote begin ===

Encrypt MD5 hash, Decrypt MD5 hash
MD5Decryption.com allows you to enter a MD5 hash and we will look *into 
our database*

and try to decrypt MD5. Basically it is a MD5 decrypter.

What is an MD5 hash, or MD5 Checksum?
MD5 is a 128-bit message digest function.
It is used commonly in user authentication and MD5 checksum for data 
integrity.


How many MD5 hashes are in our database?
*We have encrypted* more than 105,300,000 words, phrases, acronyms, etc 
since 2006.


=== quote end ===

So they have build themselves a database of a limited number of md5 
hashes and use that to resolve your requests. MD5 is a one way hashing 
function. Full stop. Don't believe it? Well... I generated a hash of 
"wrxlbrmpf" which is d162435be814d6c6f4e1e4f077e5343d. This hash is not 
found in their database. Or better yet: Hash a 1GB movie and ask them to 
decrypt that. It would definitely be awesome if you could store a 1GB 
movie inside a 16-Byte hash...


Regards,
Sven
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Re: [fpc-pascal] MD5 decryption?

[Michael Van Canneyt]

On Wed, 11 Dec 2013, silvioprog wrote:


2013/12/11 Ewald 
  Once upon a time, silvioprog said:
  > Hello,
  >
  > How to decrypt a MD5 in FPC?:
MD5 is a hashing algorithm, not an encryption algorithm. There is more
than one input for this algorithm which will generate the same hash, as
opposed to a cipher.

--
Ewald


Go to: http://md5decryption.com
In "Please input the MD5 hash that you would like to be decrypted:" field, put: 
7db4a8dae498d1b4686ebd1f79326602
See the result in "Decrypted Text:" field.


You should read the description.
They look in a database. They don't do actual decryption.

Michael.___
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Re: [fpc-pascal] MD5 decryption?

[silvioprog]

2013/12/11 Ewald 

> Once upon a time, silvioprog said:
> > Hello,
> >
> > How to decrypt a MD5 in FPC?:
> MD5 is a hashing algorithm, not an encryption algorithm. There is more
> than one input for this algorithm which will generate the same hash, as
> opposed to a cipher.
>
> --
> Ewald


Go to: http://md5decryption.com
In "Please input the MD5 hash that you would like to be decrypted:" field,
put: 7db4a8dae498d1b4686ebd1f79326602
See the result in "Decrypted Text:" field.

-- 
Silvio Clécio
My public projects - github.com/silvioprog
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Re: [fpc-pascal] MD5 decryption?

[Robert Wolfe]

Not sure if this helps or not:

http://wiki.freepascal.org/hash

On 12/11/2013 10:41 AM, silvioprog wrote:

Hello,

How to decrypt a MD5 in FPC?:

http://md5decryption.com 

--
Silvio Clécio
My public projects - github.com/silvioprog 


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Re: [fpc-pascal] MD5 decryption?

[Ewald]

Once upon a time, silvioprog said:
> Hello,
>
> How to decrypt a MD5 in FPC?:
MD5 is a hashing algorithm, not an encryption algorithm. There is more
than one input for this algorithm which will generate the same hash, as
opposed to a cipher.

-- 
Ewald

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