Show Bid Request
Encrypt string to fixed-length alpha-numeric characters with password
Bid Request Id: 74291
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Posted by: |
Sting-Ray (23 ratings)
(Software buyer rating 10 )
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Non-action Ratio: |
Very Good - 14.29%
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Buyer Security Verifications: |
Excellent
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Approved on: |
Jul 21, 2003
3:30:16 AM EDT
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Bidding Closes: |
Aug 4, 2003
3:29:05 AM EDT
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Viewed (by coders): |
475 times
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Deadline: |
8/1/2003 11:36:27 AM
(10 days after 7/22/2003 11:36:27 AM)
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Description:
I need a simple encryption/decryption routine that will encrypt strings to fixed-length alpha-numeric strings using a password. Of course, I don't want to use a simple Select Case character replacement.
The encrypted string can be longer than the input string as long as it's always the same number of characters. For example, if you encrypt any 10 character string, it may come out to say, 20 characters. But no matter what the input string is, as long as it's 10 characters, the output would always be 20 (always the same length). In case I'm not being clear, a 10 character input string could encrypt to even 35 characters, as long as it was the same length every time.
Also, it doesn't need to use high encryption, but it does need to look pretty random.
For example, the input string with some repeating characters like this: "This is a testttttttttt" might come out to "aY3K0rkQnv4NVrziR1oNFcx" but not something like "aY3K0rkQnv4NVrzieeeeeeeeee". I need to have the encrypted string to look random, even if there are some repeating characters.
It would need to be 2 functions that may look like this:
Function Encrypt(sPassword as String, sInput as String) as String
and
Function Decrypt(sPassword as String, sInput as String) as String
If you have a sample EXE already done to send, all the better.
Deliverables:
1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Installation package that will install the software (in ready-to-run condition) on the platform(s) specified in this bid request. 3) Complete ownership and distribution copyrights to all work purchased.
Platform:
Visual Basic 6
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Bidding/Comments:
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Bid Amount
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Date |
Coder Rating |
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This bid was accepted by the buyer!
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$25 (USD)
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Jul 21, 2003
6:13:19 AM EDT
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9.93
(Excellent)
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Sting-Ray.
There is no need to look further. Here's a demo. I assume you have the necessary VB 6.0 runtime.
The demo accepts 10 characters in the upper-left textbox. Clicking 'Encrypt' shows the encrypted string in the lower-left textbox. The encrypted string is always 20 characters, regardless of string length. You can copy and paste the encrypted string to the upper-right textbox. Clicking 'Decrypt' should result in the original string displaying in the lower-right textbox.
You can tell that it genuinely works by putting garbage in the upper-right textbox. You WILL receive garbage in the lower-right textbox.
I can change the number of characters used (10 and 20) to any value you want.
There are probably cheaper bids, but mine is guaranteed to work. I didn't just find some code on the Internet for this. I created it from scratch. So if there are any problems, I know the program backwards and forwards and can quickly fix it.
Thomas Tustin
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Attached File
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