In my informed opinion, Cipher-Packet (CP) is the best (most secure) encryption/decryption technology currently available.

The algorithm is simple and fast;
And if it is not perfect, it is close to perfect.

One-time pad

The One-time pad has been mathematically proven to have the property of Perfect Secrecy; the resulting ciphertext of a one-time pad is impossible to decrypt/break without knowing the (secret) key.

Whereas currently, even the best symmetric/asymmetric algorithms cannot be proven to be absolutely secure; they rely on complex or hard mathematical problems which could become vulnerable to attack.

Cipher-Packet

CP improves on the one-time pad; the ciphertext is hidden in random data - preventing an adversary from being able to isolate the ciphertext. Since an adversary is unable to isolate the ciphertext, they are unable to apply any cryptanalysis/attack.
Therefore the system should be unbreakable.

Note: The software made available here is designed and setup for file encryption/decryption.

Source code: CP16b.tar.gz