Best way to encrypt string of digits

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So we have a string of digits, lets say:

1234567890

we would like to encrypt this with a number. the encrypted string is supposed capturable, and should be obfusciated

Lets say this string has one digit, lets say the 1 (one) which changes to for example 2.

After encryption the string has to be obfusciated, and not just changing the first digit from 2 tot 8 or something

So we are doing some research and are looking at 3DES

we take the approach of k1=k3 and k2

so

k1 = 1111111111 k2 = 2222222222 k3 = k1 encryptedString = encryptk1(decryptk2(encryptk3(message)))

so k2 is our public key, and k1 and k3 are the private keys.

Now we are looking for an algoritm that encrypts the message the right way:

at this time we made it simple for us, so we did:

(message[0] + k1[0]).substr(length-1,1)

So we take the last digit of the result. But this is working as folows.

When the message[0] changes, the encryptedmessage[0] changes, but the rest of the string isnt so obviously this isnt a workable approach.

So im asking to you, what ways are thinkable about encrypting this string the right way? It should be a simple algorithm since it has to be run on embedded hardware.

Thanks in advance,

asked 43 secs ago

baklap

866

Best way to encrypt string of digits