Lake County has average temperatures ranging from the low 30's in the winter to the high 90's to low 100's in the summer. An average humidity of 50% in the winter and 30% in the summer which means virtually none of that famous California fog.
They are lever locks, with between 6 and 12 levers. They are double bitted and asymmetric, so the lock essentially has two different sets of levers. In addition, they are mostly quadruple throw, so you need to pass 4 sets of levers. The bolt work has 2 or 4 hardened steel circular bolts, providing good saw resistance.
With secret key cryptography, a single key is used for both encryption and decryption. As shown in Figure the sender uses the key (or some set of rules) to encrypt the plain text and sends the ciphertext to the receiver. The receiver applies the same key (or ruleset) to decrypt the message and recover the plain text.