Modern cryptographic algorithms, for example RSA cannot be broken, in theory, within a reasonable amount of time using a brute force method. To know why, please peruse – Pure mathematics and poetry.
Then, how is a security breached which is practically unbreakable ?
Human strengths and human weakness combined and they cannot be separated. These are signature tone of being human.
Human intuition – an innate aspect of a conscious being has access to a realm which computational complexity or algorithmic approach cannot reach, so is the verdict of many leading scientists.
Human capacity to anticipate behaviour of another human being or a group of human beings.
Suppose you open a computer / system and it says
DO YOU HAVE THE PASSWORD ?
Typed text at the password box : NO
or you type : YES
How will the system respond ?
Think…. think again.
[ This event was imagined by Umberto Eco in his novel : Foucault’s Pendulum]