# Re: Decimal encryption

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Philipp Gühring wrote:

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```Hi,

I am searching for symmetric encryption algorithms for decimal strings.

Let's say we have various 40-digit decimal numbers:
2349823966232362361233845734628834823823
3250920019325023523623692235235728239462
0198230198519248209721383748374928601923

As far as I calculated, a decimal has the equivalent of about 3,3219
bits, so with 40 digits, we have about 132,877 bits.

Now I would like to encrypt those numbers in a way that the result is a
decimal number again (that's one of the basic rules of symmetric
encryption algorithms as far as I remember).

Since the 132,877 bits is similar to 128 bit encryption (like eg. AES),
I would like to use an algorithm with a somewhat comparable strength to AES.
But the problem is that I have 132,877 bits, not 128 bits. And I can't
cut it off or enhance it, since the result has to be a 40 digit decimal
number again.

Does anyone know a an algorithm that has reasonable strength and is able
to operate on non-binary data? Preferrably on any chosen number-base?

```
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The short answer is no, nobody knows a secure algorithm that would "work" as a decimal stream cipher AND would not extend the message size for some form of key material reference data (or salt or IV ...).
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If you have room for such message-specific reference data, it should be easy to design a decimal stream cipher for short messages.
```

--

- Thierry Moreau

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