Mozilla (stylized as moz://a) is a free software community founded in 1998 by members of Netscape.
Ciphers were common long before the information age (e.g., substitution ciphers, transposition ciphers, and permutation ciphers), but none of them were cryptographically secure except for the one-time pad.
Modern ciphers are designed to withstand attacks discovered by a cryptanalyst. There is no guarantee that all attack methods have been discovered, but each algorithm is judged against known classes of attacks.
They also are classified according to how their keys are handled:
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