is there any block cipher that have a block size of 32 bit for use on .net?

Question

well i want to encrypt 32bit integers so they are represented by another 32 bit integers
i am currently using des but the resulst is 64bit integer.
so is it possible to have a block cipher with 32 bit block so the output is 32bit integer?
i don't want to use Xor Encryptions as a last resort :)
thanks

Answer 1

you can write all integers into single byte array and encrypt them, another idea is to use 64 bit integers, casting them to 32bit when needed.

Answer 2

This is the only 32-bit block cipher I am aware of: http://www.qualcomm.com.au/PublicationsDocs/skip32.c

For security, 64-bits is generally considered an absolute minimum block size.

Answer 3

To make something like this work securely with common ciphers, you'd can operate a block cipher in a "stream" mode like OFB, CFB, or CTR. This means you need to have a suitable (unpredictable) initialization vector for each integer you are trying to encrypt, or (in CTR mode) have a well-defined message order.

I'm assuming that you want to decrypt the numbers later. If you are just trying to create a pseudo-random generator with a period of 2³², there are other techniques you can try.