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A cryptographic algorithm, also called a cipher, is the mathematical function used for encryption and decryption. If the security of an algorithm is based on keeping the way that algorithm works a secret, it is a restricted algorithm. Restricted algorithms are woefully inadequate by today’s standards. A large or changing group of users cannot use them, because every time a user leaves the group, everyone else must switch to a different algorithm. If someone accidentally reveals the secret, everyone must change their algorithm.
Unless you try something to which you have not already succeeded ~ Then you shall NEVER grow