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Public-key cryptography refers to a cryptographic system requiring two separate keys, one of which is secret and one of which is public. Although different, the two parts of the key pair are mathematically linked. One key locks or encrypts the plaintext, and the other unlocks or decrypts the ciphertext. Neither key can perform both functions by itself.

Diagram for video resolution standards.

Joomla Beginner Mistakes and How to Avoid Them

Joomla is great because it empowers even non-designers to manage their sites themselves. The problem is that those customers, in their effort to run the site without bothering you, make mistakes.