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I want to encrypt and decrypt SMS with J2ME, i tried TEA algorithm, but it generates a long encrypted text.
Is there any other lightweight algorithm that generates an encrypted text with the same length as original text?
Check stream chiphers (like RC4). Those won’t increase space need. Encrypted data has same length than plain data.
If you want to encrypt 7-bit text message witch can be 160 chars. Then those does not help.
But if maximum length of plain text is 140 bytes, then those can be used.