. In most cases this amounts to how to find the key used by the intended recipients of this secret Once that key is found, then the advantage of the intended recipient of that secret is wiped out, and the key finder can read, comprehend and be exposed to anything the intended recipient can read, comprehend, and is exposed to. The classical key extracting challenge is when the cryptographic method is well known, the key space is well known, there are sufficient instances of ciphertext available, and the specific key is all that is missing.