Question: What is the reason to make encryption/decryption algorithms are publicly available? Since these algorithms are public, which means everyone knows how it works, then how

What is the reason to make encryption/decryption algorithms are publicly available? Since these algorithms are public, which means everyone knows how it works, then how to ensure the security strength of the ciphertext? Also, explain the impact of the encryption/decryption key length on the security strength of the used cryptography system.

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