A user receives an email on a company smartphone.
When trying to open the email, the user gets a message stating the email is encrypted, and the user cannot open it.
The user forwards the email to a personal email account and receives the same message.
The user calls the IT department to ask for help.
To decrypt the message, the technician tells the user to contact the sender of the message to be able to exchange:
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A. B. C. D.A.
In this scenario, the user is unable to open an email due to encryption. Encryption is a method of converting plain text into ciphertext, which can only be read by someone with the appropriate decryption key.
To decrypt the message, the technician tells the user to contact the sender of the message. This is because the sender likely encrypted the email using a public key encryption system. In this system, the sender has a public key that can be used to encrypt messages, but only the sender has the private key required to decrypt the message.
The technician tells the user to contact the sender to exchange keys. This means that the sender will need to provide the user with their public key, which the user can use to decrypt the message. The sender will also need the user's public key, so they can encrypt future messages to the user.
Passwords, root CA, and tokens are not relevant to this scenario. Passwords are used to authenticate users, not to decrypt messages. A root CA (certificate authority) is used to verify the authenticity of digital certificates, which are used for secure communications over the internet, but not for email encryption. Tokens are typically used for two-factor authentication, but not for email encryption.