Java encryption : which method can get me a shorter message ?

Question

I don't know too much about encryption, I just want to ask, which method can get me the shortest result message ?

For instance, the message looks like this : "This is the secret input message", I wonder if the encrypted message can be shorter then the above 32 characters long ? Maybe something like "dfkfjkvf12".

Frank

Answer 1

It is mathematically impossible for the ciphertext to be shorter than the plaintext.

In general, longer ciphertexts mean securer cipers.

Answer 2

If you want the output to be shorter than the input, you're not really talking about encryption. What you're talking about is compression or, more likely, hashing. If you just want a secure way to compare a known text with a ciphertext (such as for password exchange, for example), then there are any number of hashing schemes you can use, the most well-known of which is probably MD5.