Encrypt and decrypt input data to create a 16 to 24 digit alphanumeric string

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Is there any way to encrypt the whole Input data into 16 to 24 character alphanumeric string and again able to decrypt it into normal string in c#?

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Is there any way to encrypt the whole Input data into 16 to 24 character alphanumeric string and again able to decrypt it into normal string in c#?

Posted 14-Dec-18 19:57pm

Member 12806413

Updated 8-Feb-19 1:21am

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Richard MacCutchan 8-Feb-19 7:09am

You already have the answer. Why have you updated this question?

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OriginalGriff · Answer 1 · 2018-12-14T20:05:00

No.

You can't encrypt data into a fixed size at all, and particularly not into a small number of bits: if you could, why would we stream movies as 10GB lumps, web pages as huge chunks of "text"? We'd just encrypt them to 24 char alpha values and send that instead. Why would we store files on HDD's in "raw input" instead of storing the 24 char value and expanding it when we needed it? Think of the cost savings!

Rather the opposite: encrypted data is very often significantly larger than the unencrypted source!

You are probably thinking of MD5 and SHA algorithms which do generate fixed length outputs - but those are not encryption algorithms, they are hashing algorithms, and the output cannot be converted back to restore the original input data (and that is by design).

Patrice T · Answer 2 · 2018-12-15T00:19:00

Quote:
Is there any way to encrypt the whole Input data into 16 to 24 character alphanumeric string and again able to decrypt it into normal string in c#?

Yes, only if input is no more than 24 characters alphanumeric string.
Beware, with utf-8, some characters are encoded on more than an 8 bits char.
If your question imply changing the size of input to less than 24 chars, it is compression. And nothing can guaranty a given output size.

Basically, encryption does not change the size of input, or makes it bigger with bloc cypher, because input is expanded to multiple of bloc size.

CPallini · Answer 3 · 2019-02-08T01:21:00

Some remarks:

Encryption is not compression. If you are looking for way to reduce the size of your data, then you should search for compression algorithms.
Usually encryption algorithms (e.g. the AES you tagged your question with ) produce binary data. You may represent such binary output with ASCII characters by means of base64[^] if you wish (this would increase the output size).

Encrypt and decrypt input data to create a 16 to 24 digit alphanumeric string

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