Stream Cipher Encryption with short encrypted string

Question

I am looking for a Stream Cipher encryption method, that will result in the encrypted string being prefferably as short as possible, and containing alphanumeric characters only. Is there such a thing built in .NET? I have researched but could not find something like this.

Thank you,

I found the answer here http://stackoverflow.com/questions/1192732/really-simple-short-string-compression , meaning its not possible, as encryption means also making the value longer. The best that can be done is keeping the same size of the input, but if the result must be alphanumeric then a longer string is a must. — Amc_rtty, May 18 '12 at 16:52
Well, mathematically speaking, you *should* be able to use the exact same size of the input + max 1 bit. But it's tricky to get that performing all right, lots of division with big numbers. You could try to get something as much bit alligned as possible though, and then convert back. — Maarten Bodewes, May 20 '12 at 01:44

score 0 · Accepted Answer · edited May 23 '17 at 11:55

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I found the answer here Really simple short string compression, meaning its not possible, as encryption means also making the value longer. The best that can be done is keeping the same size of the input, but if the result must be alphanumeric then a longer string is a must

edited May 23 '17 at 11:55

Community

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answered Jun 10 '12 at 09:20

Amc_rtty

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And in the case of a stream cipher, you must also add a nonce, making it even longer. – CodesInChaos Jun 10 '12 at 09:22

score -3 · Answer 2 · answered Jun 08 '12 at 08:10

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You can make it shorter - just zip the resulting encrypted string using java or some other library and output as hex. Pretty straight forward.

answered Jun 08 '12 at 08:10

Sean

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You can find in the link I provided as a comment to my own post, why hex is completely out of the question as a valid solution. – Amc_rtty Jun 08 '12 at 20:21
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Encrypted data cannot be compressed. – CodesInChaos Jun 10 '12 at 09:23

Stream Cipher Encryption with short encrypted string

2 Answers2