A cryptography system designed by Irish Sarah Flannery, who was 16 at the time when she invented it.
The algorithm is hyped to be as secure as the RSA algorithm, but it's a lot faster and requires much less computational power. It's based on matrix multiplications.
It should be noted that an attack against it does exist, and as such, it should not be used as a public key cipher, only as a symmetric one (if even that).
Here's a document that describes it in detail, with the attack and commentary: http://cryptome.org/flannery-cp.htm