A company is developing a security policy for secure communication. in the exchange of critical messages between a headquarters office and a branch office, a hash value should only be recalculated with a predetermined code, thus ensuring the validity of data source. which aspect of secure communications is addressed?

Question: A company is developing a security policy for secure communication. in the exchange of critical messages between a headquarters office and a branch office, a hash value should only be recalculated with a predetermined code, thus ensuring the validity of data source. which aspect of secure communications is addressed?

One of the challenges that many organizations face today is how to ensure secure communication between different locations. For example, a company may need to exchange critical messages between a headquarters office and a branch office, such as financial reports, customer data, or strategic plans. How can the company protect these messages from being intercepted, modified, or forged by malicious actors?

One possible solution is to use a technique called hashing. Hashing is a process that takes an input message and produces a fixed-length output called a hash value or a digest. The hash value is unique to the input message and cannot be reversed to obtain the original message. Therefore, hashing can be used to verify the integrity and authenticity of a message.

For instance, suppose the headquarters office wants to send a message to the branch office. The headquarters office can first calculate the hash value of the message using a predetermined algorithm and a secret code known only to both parties. The secret code is also called a key or a salt. The headquarters office can then append the hash value to the message and send both to the branch office.

The branch office can then receive the message and the hash value and perform the same hashing process using the same algorithm and key. The branch office can then compare the hash value it calculated with the one received from the headquarters office. If they match, it means that the message has not been altered or tampered with during transmission and that it came from a trusted source. If they do not match, it means that either the message or the hash value has been modified or forged by an unauthorized party.

By using this hashing technique, the company can address one of the aspects of secure communication: data integrity. Data integrity refers to the property that data has not been changed or corrupted in an unauthorized manner. By recalculating the hash value with a predetermined code, the company can ensure that the data source is valid and that the message has not been compromised.

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