C# encryption specific data different output

Question

I'm looking for way of encrypting/decrypting a specific value but with different output every time.

I have a list of users and each has an UserId which is a Guid.

User1: 00838CED-6926-4632-830F-B8F509BEC0F5

User2: 7DEAAC47-FE88-4943-BFDE-AAC986F65A23

User3: ECBB005F-1E6B-441A-8538-944383D6C0AE
.........
UserN: 479A344E-364D-4DA7-A3F8-99D94301815F

Then I want to be able to encrypt these guids in such a way that each time I get a different output. And when I decrypt it it will get me that UserId which is the guid.

Any ideas?

Add a random string to the end of the GUID each time you encrypt, and strip it off and discard it when you decrypt. — RichieHindle
– RichieHindle, Commented Aug 18, 2014 at 12:14
FYI, this is called salting. Do a search for "salting passwords" :) — racraman
– racraman, Commented Aug 18, 2014 at 12:22

RichieHindle · Accepted Answer · 2014-08-18 12:18:24Z

1

Add a random string to the end of the GUID each time you encrypt, and strip it off and discard it when you decrypt.

To encrypt:

# Add a random string to the end of the GUID before encrypting
encrypted = encrypt(guid + ":" + a_random_string)

To decrypt:

# Strip off and discard the random string after decrypting.
guid = decrypt(encrypted).split(':')[0]

answered Aug 18, 2014 at 12:18

RichieHindle

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Comments

Dharani Kumar · Accepted Answer · 2014-08-18 12:19:27Z

0

For that you can create a custom class.Go like this in that class

1.Add an unique string like datetime to the userid at the end
2.encrypt the value
3.Store it in dictionary with key as string and encrypted userid as value
4.Reverse the process on decryption.

answered Aug 18, 2014 at 12:19

Dharani Kumar

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