Translation of "Indescifrable" in English

Que creíamos indescifrable y que permanecería siempre así.

that we thought was unbreakable and that was going to remain that way.

Un cifrado mucho más complejo que pensaban era indescifrable.

a much more complicated encryption scheme that they thought was unbreakable.

–el sistema indescifrable que nos ha protegido por décadas–

the same unbreakable system that's protected us for decades,