One way to guard against a hacker reading a message sent from one company to another over the Internet is to use:

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Encryption is the process of encoding messages or information in a way that only authorized parties can read it. By using encryption, the message sent over the Internet is turned into a code that is unreadable to anyone who does not have the key to unlock it. This helps guard against hackers who might intercept the message and attempt to read it. Firewalls and intrusion protection devices also provide security, but they are primarily used to block unauthorized access to a network or system. Incident response procedures are plans put in place to handle security breaches after they have occurred, but they do not prevent hackers from accessing the message in the first place.

One Way to Guard Against a Hacker Reading a Message