Simple C# encryption in CF

i'm looking for a very simple encryption / decryption algorithm.
for example a string would be encrypted into a string containing only 6-8
numbers.

Which method would I use here?

Thank you!

Chris
Wed Nov 23 13:47:23 CST 2005

Encryption is pretty broad. How strong of encryption do you need? Here's a
TripleDES sample:

http://blog.opennetcf.org/ctacke/PermaLink,guid,203bb0a3-2459-48fa-84f9-717dc71d6b95.aspx

--
Chris Tacke
Co-founder
OpenNETCF.org
Are you using the SDF? Let's do a case study.
Email us at d c s @ o p e n n e t c f . c o m
http://www.opennetcf.org/donate


"Nathan Laff" <nlaff@comcast.nospam.net> wrote in message
news:fbqdnSQ7a9FPXhnenZ2dnUVZ_v-dnZ2d@comcast.com...
> i'm looking for a very simple encryption / decryption algorithm.
> for example a string would be encrypted into a string containing only 6-8
> numbers.
>
> Which method would I use here?
>
> Thank you!
>

Nathan
Wed Nov 23 13:53:38 CST 2005

not strong. think of every smart phone app registration :) (at least all the
ones i've seen are pretty much the same, small string containing only
numbers based on owner name)

not strong, just a key for a program that will be sold for 1.99.

so, Nathan Laff would encrypt to like 928375



"Chris Tacke, eMVP" <ctacke@spamfree-opennetcf.org> wrote in message
news:%23XSd6aG8FHA.3200@TK2MSFTNGP11.phx.gbl...
> Encryption is pretty broad. How strong of encryption do you need? Here's
> a TripleDES sample:
>
> http://blog.opennetcf.org/ctacke/PermaLink,guid,203bb0a3-2459-48fa-84f9-717dc71d6b95.aspx
>
> --
> Chris Tacke
> Co-founder
> OpenNETCF.org
> Are you using the SDF? Let's do a case study.
> Email us at d c s @ o p e n n e t c f . c o m
> http://www.opennetcf.org/donate
>
>
> "Nathan Laff" <nlaff@comcast.nospam.net> wrote in message
> news:fbqdnSQ7a9FPXhnenZ2dnUVZ_v-dnZ2d@comcast.com...
>> i'm looking for a very simple encryption / decryption algorithm.
>> for example a string would be encrypted into a string containing only 6-8
>> numbers.
>>
>> Which method would I use here?
>>
>> Thank you!
>>
>
>

Ilya
Wed Nov 23 13:55:13 CST 2005

You're probably talking about hash, not encryption. If so, just use
String.GetHashCode().

Encryption would generate data with size proportional to original and can be
decrypted back.

With hash you get a fixed size number which can not be restored back to the
original.



You could use OpenNETCF.Security.Cryptography namespace with NETCF V1.

NETCF V2 has native encryption support in System.Security.Cryptography
namespace.

It also has hashing support.



Best regards,


Ilya

This posting is provided "AS IS" with no warranties, and confers no rights.

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"Nathan Laff" <nlaff@comcast.nospam.net> wrote in message
news:fbqdnSQ7a9FPXhnenZ2dnUVZ_v-dnZ2d@comcast.com...
> i'm looking for a very simple encryption / decryption algorithm.
> for example a string would be encrypted into a string containing only 6-8
> numbers.
>
> Which method would I use here?
>
> Thank you!
>

Nathan
Wed Nov 23 15:09:35 CST 2005

How would i use that to create passwords/keys from a string?
seems like that would be pretty easy to crack :)

"Ilya Tumanov [MS]" <ilyatum@online.microsoft.com> wrote in message
news:4384c921$1@news.microsoft.com...
> You're probably talking about hash, not encryption. If so, just use
> String.GetHashCode().
>
> Encryption would generate data with size proportional to original and can
> be decrypted back.
>
> With hash you get a fixed size number which can not be restored back to
> the original.
>
>
>
> You could use OpenNETCF.Security.Cryptography namespace with NETCF V1.
>
> NETCF V2 has native encryption support in System.Security.Cryptography
> namespace.
>
> It also has hashing support.
>
>
>
> Best regards,
>
>
> Ilya
>
> This posting is provided "AS IS" with no warranties, and confers no
> rights.
>
> *** Want to find answers instantly? Here's how... ***
>
> 1. Go to
> http://groups-beta.google.com/group/microsoft.public.dotnet.framework.compactframework?hl=en
> 2. Type your question in the text box near "Search this group" button.
> 3. Hit "Search this group" button.
> 4. Read answer(s).
>
> "Nathan Laff" <nlaff@comcast.nospam.net> wrote in message
> news:fbqdnSQ7a9FPXhnenZ2dnUVZ_v-dnZ2d@comcast.com...
>> i'm looking for a very simple encryption / decryption algorithm.
>> for example a string would be encrypted into a string containing only 6-8
>> numbers.
>>
>> Which method would I use here?
>>
>> Thank you!
>>
>
>

Ilya
Wed Nov 23 15:25:56 CST 2005

If you have initial string, yes, that would be easy. But it would be easy no
matter what you use for hashing in this case.

Anyway, you could use, say, industry standard MD5 if you believe it's more
secure.


Best regards,

Ilya

This posting is provided "AS IS" with no warranties, and confers no rights.

*** Want to find answers instantly? Here's how... ***

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3. Hit "Search this group" button.
4. Read answer(s).

"Nathan Laff" <nlaff@comcast.nospam.net> wrote in message
news:nImdnYFk498SRxnenZ2dnUVZ_sqdnZ2d@comcast.com...
> How would i use that to create passwords/keys from a string?
> seems like that would be pretty easy to crack :)
>
> "Ilya Tumanov [MS]" <ilyatum@online.microsoft.com> wrote in message
> news:4384c921$1@news.microsoft.com...
>> You're probably talking about hash, not encryption. If so, just use
>> String.GetHashCode().
>>
>> Encryption would generate data with size proportional to original and can
>> be decrypted back.
>>
>> With hash you get a fixed size number which can not be restored back to
>> the original.
>>
>>
>>
>> You could use OpenNETCF.Security.Cryptography namespace with NETCF V1.
>>
>> NETCF V2 has native encryption support in System.Security.Cryptography
>> namespace.
>>
>> It also has hashing support.
>>
>>
>>
>> Best regards,
>>
>>
>> Ilya
>>
>> This posting is provided "AS IS" with no warranties, and confers no
>> rights.
>>
>> *** Want to find answers instantly? Here's how... ***
>>
>> 1. Go to
>> http://groups-beta.google.com/group/microsoft.public.dotnet.framework.compactframework?hl=en
>> 2. Type your question in the text box near "Search this group" button.
>> 3. Hit "Search this group" button.
>> 4. Read answer(s).
>>
>> "Nathan Laff" <nlaff@comcast.nospam.net> wrote in message
>> news:fbqdnSQ7a9FPXhnenZ2dnUVZ_v-dnZ2d@comcast.com...
>>> i'm looking for a very simple encryption / decryption algorithm.
>>> for example a string would be encrypted into a string containing only
>>> 6-8 numbers.
>>>
>>> Which method would I use here?
>>>
>>> Thank you!
>>>
>>
>>
>
>

Nathan
Wed Nov 23 15:45:47 CST 2005

yeah, MD5 is a bit more then i needed.

HashCodes seem to be what i want to use, but how would i use this in a
Licence Key scenario?

thanks so much!

"Ilya Tumanov [MS]" <ilyatum@online.microsoft.com> wrote in message
news:4384de64$1@news.microsoft.com...
> If you have initial string, yes, that would be easy. But it would be easy
> no matter what you use for hashing in this case.
>
> Anyway, you could use, say, industry standard MD5 if you believe it's more
> secure.
>
>
> Best regards,
>
> Ilya
>
> This posting is provided "AS IS" with no warranties, and confers no
> rights.
>
> *** Want to find answers instantly? Here's how... ***
>
> 1. Go to
> http://groups-beta.google.com/group/microsoft.public.dotnet.framework.compactframework?hl=en
> 2. Type your question in the text box near "Search this group" button.
> 3. Hit "Search this group" button.
> 4. Read answer(s).
>
> "Nathan Laff" <nlaff@comcast.nospam.net> wrote in message
> news:nImdnYFk498SRxnenZ2dnUVZ_sqdnZ2d@comcast.com...
>> How would i use that to create passwords/keys from a string?
>> seems like that would be pretty easy to crack :)
>>
>> "Ilya Tumanov [MS]" <ilyatum@online.microsoft.com> wrote in message
>> news:4384c921$1@news.microsoft.com...
>>> You're probably talking about hash, not encryption. If so, just use
>>> String.GetHashCode().
>>>
>>> Encryption would generate data with size proportional to original and
>>> can be decrypted back.
>>>
>>> With hash you get a fixed size number which can not be restored back to
>>> the original.
>>>
>>>
>>>
>>> You could use OpenNETCF.Security.Cryptography namespace with NETCF V1.
>>>
>>> NETCF V2 has native encryption support in System.Security.Cryptography
>>> namespace.
>>>
>>> It also has hashing support.
>>>
>>>
>>>
>>> Best regards,
>>>
>>>
>>> Ilya
>>>
>>> This posting is provided "AS IS" with no warranties, and confers no
>>> rights.
>>>
>>> *** Want to find answers instantly? Here's how... ***
>>>
>>> 1. Go to
>>> http://groups-beta.google.com/group/microsoft.public.dotnet.framework.compactframework?hl=en
>>> 2. Type your question in the text box near "Search this group" button.
>>> 3. Hit "Search this group" button.
>>> 4. Read answer(s).
>>>
>>> "Nathan Laff" <nlaff@comcast.nospam.net> wrote in message
>>> news:fbqdnSQ7a9FPXhnenZ2dnUVZ_v-dnZ2d@comcast.com...
>>>> i'm looking for a very simple encryption / decryption algorithm.
>>>> for example a string would be encrypted into a string containing only
>>>> 6-8 numbers.
>>>>
>>>> Which method would I use here?
>>>>
>>>> Thank you!
>>>>
>>>
>>>
>>
>>
>
>

Ilya
Wed Nov 23 16:10:28 CST 2005

You really don't want anybody to know how it works exactly, so it's up to
you to come up with the solution and keep it secret. :)


Best regards,

Ilya

This posting is provided "AS IS" with no warranties, and confers no rights.

*** Want to find answers instantly? Here's how... ***

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3. Hit "Search this group" button.
4. Read answer(s).

"Nathan Laff" <nlaff@comcast.nospam.net> wrote in message
news:9p-dnRv_ipCRfhneRVn-iA@comcast.com...
> yeah, MD5 is a bit more then i needed.
>
> HashCodes seem to be what i want to use, but how would i use this in a
> Licence Key scenario?
>
> thanks so much!
>
> "Ilya Tumanov [MS]" <ilyatum@online.microsoft.com> wrote in message
> news:4384de64$1@news.microsoft.com...
>> If you have initial string, yes, that would be easy. But it would be easy
>> no matter what you use for hashing in this case.
>>
>> Anyway, you could use, say, industry standard MD5 if you believe it's
>> more secure.
>>
>>
>> Best regards,
>>
>> Ilya
>>
>> This posting is provided "AS IS" with no warranties, and confers no
>> rights.
>>
>> *** Want to find answers instantly? Here's how... ***
>>
>> 1. Go to
>> http://groups-beta.google.com/group/microsoft.public.dotnet.framework.compactframework?hl=en
>> 2. Type your question in the text box near "Search this group" button.
>> 3. Hit "Search this group" button.
>> 4. Read answer(s).
>>
>> "Nathan Laff" <nlaff@comcast.nospam.net> wrote in message
>> news:nImdnYFk498SRxnenZ2dnUVZ_sqdnZ2d@comcast.com...
>>> How would i use that to create passwords/keys from a string?
>>> seems like that would be pretty easy to crack :)
>>>
>>> "Ilya Tumanov [MS]" <ilyatum@online.microsoft.com> wrote in message
>>> news:4384c921$1@news.microsoft.com...
>>>> You're probably talking about hash, not encryption. If so, just use
>>>> String.GetHashCode().
>>>>
>>>> Encryption would generate data with size proportional to original and
>>>> can be decrypted back.
>>>>
>>>> With hash you get a fixed size number which can not be restored back to
>>>> the original.
>>>>
>>>>
>>>>
>>>> You could use OpenNETCF.Security.Cryptography namespace with NETCF V1.
>>>>
>>>> NETCF V2 has native encryption support in System.Security.Cryptography
>>>> namespace.
>>>>
>>>> It also has hashing support.
>>>>
>>>>
>>>>
>>>> Best regards,
>>>>
>>>>
>>>> Ilya
>>>>
>>>> This posting is provided "AS IS" with no warranties, and confers no
>>>> rights.
>>>>
>>>> *** Want to find answers instantly? Here's how... ***
>>>>
>>>> 1. Go to
>>>> http://groups-beta.google.com/group/microsoft.public.dotnet.framework.compactframework?hl=en
>>>> 2. Type your question in the text box near "Search this group" button.
>>>> 3. Hit "Search this group" button.
>>>> 4. Read answer(s).
>>>>
>>>> "Nathan Laff" <nlaff@comcast.nospam.net> wrote in message
>>>> news:fbqdnSQ7a9FPXhnenZ2dnUVZ_v-dnZ2d@comcast.com...
>>>>> i'm looking for a very simple encryption / decryption algorithm.
>>>>> for example a string would be encrypted into a string containing only
>>>>> 6-8 numbers.
>>>>>
>>>>> Which method would I use here?
>>>>>
>>>>> Thank you!
>>>>>
>>>>
>>>>
>>>
>>>
>>
>>
>
>

Chris
Wed Nov 23 16:13:48 CST 2005

Easy to crack, but is it worth cracking for $1.99? It's a cost/benefit
analysis.

--
Chris Tacke
Co-founder
OpenNETCF.org
Are you using the SDF? Let's do a case study.
Email us at d c s @ o p e n n e t c f . c o m
http://www.opennetcf.org/donate


"Nathan Laff" <nlaff@comcast.nospam.net> wrote in message
news:nImdnYFk498SRxnenZ2dnUVZ_sqdnZ2d@comcast.com...
> How would i use that to create passwords/keys from a string?
> seems like that would be pretty easy to crack :)
>
> "Ilya Tumanov [MS]" <ilyatum@online.microsoft.com> wrote in message
> news:4384c921$1@news.microsoft.com...
>> You're probably talking about hash, not encryption. If so, just use
>> String.GetHashCode().
>>
>> Encryption would generate data with size proportional to original and can
>> be decrypted back.
>>
>> With hash you get a fixed size number which can not be restored back to
>> the original.
>>
>>
>>
>> You could use OpenNETCF.Security.Cryptography namespace with NETCF V1.
>>
>> NETCF V2 has native encryption support in System.Security.Cryptography
>> namespace.
>>
>> It also has hashing support.
>>
>>
>>
>> Best regards,
>>
>>
>> Ilya
>>
>> This posting is provided "AS IS" with no warranties, and confers no
>> rights.
>>
>> *** Want to find answers instantly? Here's how... ***
>>
>> 1. Go to
>> http://groups-beta.google.com/group/microsoft.public.dotnet.framework.compactframework?hl=en
>> 2. Type your question in the text box near "Search this group" button.
>> 3. Hit "Search this group" button.
>> 4. Read answer(s).
>>
>> "Nathan Laff" <nlaff@comcast.nospam.net> wrote in message
>> news:fbqdnSQ7a9FPXhnenZ2dnUVZ_v-dnZ2d@comcast.com...
>>> i'm looking for a very simple encryption / decryption algorithm.
>>> for example a string would be encrypted into a string containing only
>>> 6-8 numbers.
>>>
>>> Which method would I use here?
>>>
>>> Thank you!
>>>
>>
>>
>
>

Nathan
Wed Nov 23 17:31:26 CST 2005

but i clearly don't understand what to do :)

maybe an example?
s
"Ilya Tumanov [MS]" <ilyatum@online.microsoft.com> wrote in message
news:4384e8d4$1@news.microsoft.com...
> You really don't want anybody to know how it works exactly, so it's up to
> you to come up with the solution and keep it secret. :)
>
>
> Best regards,
>
> Ilya
>
> This posting is provided "AS IS" with no warranties, and confers no
> rights.
>
> *** Want to find answers instantly? Here's how... ***
>
> 1. Go to
> http://groups-beta.google.com/group/microsoft.public.dotnet.framework.compactframework?hl=en
> 2. Type your question in the text box near "Search this group" button.
> 3. Hit "Search this group" button.
> 4. Read answer(s).
>
> "Nathan Laff" <nlaff@comcast.nospam.net> wrote in message
> news:9p-dnRv_ipCRfhneRVn-iA@comcast.com...
>> yeah, MD5 is a bit more then i needed.
>>
>> HashCodes seem to be what i want to use, but how would i use this in a
>> Licence Key scenario?
>>
>> thanks so much!
>>
>> "Ilya Tumanov [MS]" <ilyatum@online.microsoft.com> wrote in message
>> news:4384de64$1@news.microsoft.com...
>>> If you have initial string, yes, that would be easy. But it would be
>>> easy no matter what you use for hashing in this case.
>>>
>>> Anyway, you could use, say, industry standard MD5 if you believe it's
>>> more secure.
>>>
>>>
>>> Best regards,
>>>
>>> Ilya
>>>
>>> This posting is provided "AS IS" with no warranties, and confers no
>>> rights.
>>>
>>> *** Want to find answers instantly? Here's how... ***
>>>
>>> 1. Go to
>>> http://groups-beta.google.com/group/microsoft.public.dotnet.framework.compactframework?hl=en
>>> 2. Type your question in the text box near "Search this group" button.
>>> 3. Hit "Search this group" button.
>>> 4. Read answer(s).
>>>
>>> "Nathan Laff" <nlaff@comcast.nospam.net> wrote in message
>>> news:nImdnYFk498SRxnenZ2dnUVZ_sqdnZ2d@comcast.com...
>>>> How would i use that to create passwords/keys from a string?
>>>> seems like that would be pretty easy to crack :)
>>>>
>>>> "Ilya Tumanov [MS]" <ilyatum@online.microsoft.com> wrote in message
>>>> news:4384c921$1@news.microsoft.com...
>>>>> You're probably talking about hash, not encryption. If so, just use
>>>>> String.GetHashCode().
>>>>>
>>>>> Encryption would generate data with size proportional to original and
>>>>> can be decrypted back.
>>>>>
>>>>> With hash you get a fixed size number which can not be restored back
>>>>> to the original.
>>>>>
>>>>>
>>>>>
>>>>> You could use OpenNETCF.Security.Cryptography namespace with NETCF V1.
>>>>>
>>>>> NETCF V2 has native encryption support in System.Security.Cryptography
>>>>> namespace.
>>>>>
>>>>> It also has hashing support.
>>>>>
>>>>>
>>>>>
>>>>> Best regards,
>>>>>
>>>>>
>>>>> Ilya
>>>>>
>>>>> This posting is provided "AS IS" with no warranties, and confers no
>>>>> rights.
>>>>>
>>>>> *** Want to find answers instantly? Here's how... ***
>>>>>
>>>>> 1. Go to
>>>>> http://groups-beta.google.com/group/microsoft.public.dotnet.framework.compactframework?hl=en
>>>>> 2. Type your question in the text box near "Search this group" button.
>>>>> 3. Hit "Search this group" button.
>>>>> 4. Read answer(s).
>>>>>
>>>>> "Nathan Laff" <nlaff@comcast.nospam.net> wrote in message
>>>>> news:fbqdnSQ7a9FPXhnenZ2dnUVZ_v-dnZ2d@comcast.com...
>>>>>> i'm looking for a very simple encryption / decryption algorithm.
>>>>>> for example a string would be encrypted into a string containing only
>>>>>> 6-8 numbers.
>>>>>>
>>>>>> Which method would I use here?
>>>>>>
>>>>>> Thank you!
>>>>>>
>>>>>
>>>>>
>>>>
>>>>
>>>
>>>
>>
>>
>
>

ctacke/>
Wed Nov 23 19:14:11 CST 2005

It could be as simple as running a 32 bit CRC on the username with a custom
"secret" algorithm as the base instead of a commonly accepted algorithm.
Not overly secure, but easy enough to implement, pretty certain to give a
unique hash for every username, and "secure" enough to keep blatant amateurs
from figuring it out.

-Chris



"Nathan Laff" <nlaff@comcast.nospam.net> wrote in message
news:Me6dnQfQv4VTZhnenZ2dnUVZ_tednZ2d@comcast.com...
> but i clearly don't understand what to do :)
>
> maybe an example?
> s
> "Ilya Tumanov [MS]" <ilyatum@online.microsoft.com> wrote in message
> news:4384e8d4$1@news.microsoft.com...
>> You really don't want anybody to know how it works exactly, so it's up to
>> you to come up with the solution and keep it secret. :)
>>
>>
>> Best regards,
>>
>> Ilya
>>
>> This posting is provided "AS IS" with no warranties, and confers no
>> rights.
>>
>> *** Want to find answers instantly? Here's how... ***
>>
>> 1. Go to
>> http://groups-beta.google.com/group/microsoft.public.dotnet.framework.compactframework?hl=en
>> 2. Type your question in the text box near "Search this group" button.
>> 3. Hit "Search this group" button.
>> 4. Read answer(s).
>>
>> "Nathan Laff" <nlaff@comcast.nospam.net> wrote in message
>> news:9p-dnRv_ipCRfhneRVn-iA@comcast.com...
>>> yeah, MD5 is a bit more then i needed.
>>>
>>> HashCodes seem to be what i want to use, but how would i use this in a
>>> Licence Key scenario?
>>>
>>> thanks so much!
>>>
>>> "Ilya Tumanov [MS]" <ilyatum@online.microsoft.com> wrote in message
>>> news:4384de64$1@news.microsoft.com...
>>>> If you have initial string, yes, that would be easy. But it would be
>>>> easy no matter what you use for hashing in this case.
>>>>
>>>> Anyway, you could use, say, industry standard MD5 if you believe it's
>>>> more secure.
>>>>
>>>>
>>>> Best regards,
>>>>
>>>> Ilya
>>>>
>>>> This posting is provided "AS IS" with no warranties, and confers no
>>>> rights.
>>>>
>>>> *** Want to find answers instantly? Here's how... ***
>>>>
>>>> 1. Go to
>>>> http://groups-beta.google.com/group/microsoft.public.dotnet.framework.compactframework?hl=en
>>>> 2. Type your question in the text box near "Search this group" button.
>>>> 3. Hit "Search this group" button.
>>>> 4. Read answer(s).
>>>>
>>>> "Nathan Laff" <nlaff@comcast.nospam.net> wrote in message
>>>> news:nImdnYFk498SRxnenZ2dnUVZ_sqdnZ2d@comcast.com...
>>>>> How would i use that to create passwords/keys from a string?
>>>>> seems like that would be pretty easy to crack :)
>>>>>
>>>>> "Ilya Tumanov [MS]" <ilyatum@online.microsoft.com> wrote in message
>>>>> news:4384c921$1@news.microsoft.com...
>>>>>> You're probably talking about hash, not encryption. If so, just use
>>>>>> String.GetHashCode().
>>>>>>
>>>>>> Encryption would generate data with size proportional to original and
>>>>>> can be decrypted back.
>>>>>>
>>>>>> With hash you get a fixed size number which can not be restored back
>>>>>> to the original.
>>>>>>
>>>>>>
>>>>>>
>>>>>> You could use OpenNETCF.Security.Cryptography namespace with NETCF
>>>>>> V1.
>>>>>>
>>>>>> NETCF V2 has native encryption support in
>>>>>> System.Security.Cryptography namespace.
>>>>>>
>>>>>> It also has hashing support.
>>>>>>
>>>>>>
>>>>>>
>>>>>> Best regards,
>>>>>>
>>>>>>
>>>>>> Ilya
>>>>>>
>>>>>> This posting is provided "AS IS" with no warranties, and confers no
>>>>>> rights.
>>>>>>
>>>>>> *** Want to find answers instantly? Here's how... ***
>>>>>>
>>>>>> 1. Go to
>>>>>> http://groups-beta.google.com/group/microsoft.public.dotnet.framework.compactframework?hl=en
>>>>>> 2. Type your question in the text box near "Search this group"
>>>>>> button.
>>>>>> 3. Hit "Search this group" button.
>>>>>> 4. Read answer(s).
>>>>>>
>>>>>> "Nathan Laff" <nlaff@comcast.nospam.net> wrote in message
>>>>>> news:fbqdnSQ7a9FPXhnenZ2dnUVZ_v-dnZ2d@comcast.com...
>>>>>>> i'm looking for a very simple encryption / decryption algorithm.
>>>>>>> for example a string would be encrypted into a string containing
>>>>>>> only 6-8 numbers.
>>>>>>>
>>>>>>> Which method would I use here?
>>>>>>>
>>>>>>> Thank you!
>>>>>>>
>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>
>>>>
>>>
>>>
>>
>>
>
>