Is it possible to retrieve the original value of data that has been hashed? Can the hashcode be reversed to reveal the real value of the data?
String ida = new String(txtID.getText().toString());
int idb = ida.hashCode();
codeD.setText("result: " + ida);
I have already obtained the hashcode of the user input (txtID), but now I am looking for a way to extract the actual value that was hashed without referring back to the variable ida.
Simply put: no.
Delving deeper: A hash serves as a rapid, one-way calculation to loosely pinpoint a specific entity. In the realm of Java, hash codes typically serve the purpose of entering an entity into a Map structure. The hash code plays a vital role in distinguishing one Object from another when utilized as the key in a HashMap. Its primary function is not data storage but rather ensuring enough differentiation to evade collisions. It is entirely feasible for two distinct objects to share the same hash value.
CodeChimp made it clear that what you are attempting is not Hashing, but Encrypting/Decrypting. You can find a helpful example here:
If you're into reinventing the wheel, you might enjoy trying this out: http://en.wikipedia.org/wiki/Affine_cipher
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