What is true about Twitter's public key in secure communication?

What is true about Twitter's public key in secure communication?

• A. It is used to sign tweets
• B. It is kept secret by Twitter
• C. It is provided to enable secure communication with Twitter
• D. It is used to impersonate users

Answer: (C)

Public-key cryptography relies on a pair: a public key that can be shared openly and a private key that stays secret. In secure web communication, Twitter publishes its public key so clients can establish a trusted, encrypted connection. The client uses that public key to help set up a session key and to verify that the data really comes from Twitter. The private key, kept secret by Twitter, is what allows Twitter to decrypt messages encrypted with the public key or to sign data that proves its identity. This setup enables secure communication with Twitter, ensuring confidentiality and authenticity of the connection. The public key isn’t kept secret, isn’t used to sign tweets, and isn’t intended to impersonate users.

Public-key cryptography relies on a pair: a public key that can be shared openly and a private key that stays secret. In secure web communication, Twitter publishes its public key so clients can establish a trusted, encrypted connection. The client uses that public key to help set up a session key and to verify that the data really comes from Twitter. The private key, kept secret by Twitter, is what allows Twitter to decrypt messages encrypted with the public key or to sign data that proves its identity. This setup enables secure communication with Twitter, ensuring confidentiality and authenticity of the connection. The public key isn’t kept secret, isn’t used to sign tweets, and isn’t intended to impersonate users.