What is the term for the encryption algorithm run in reverse?

• A. Encryption algorithm
• B. Decryption algorithm
• C. Hash algorithm
• D. Compression algorithm

Answer: (B)

The term for the encryption algorithm run in reverse is known as the decryption algorithm. This process involves taking the encrypted data, or ciphertext, and converting it back into its original form, which is referred to as plaintext. This is essential in ensuring that only authorized users can access the original data after it has been encrypted for security purposes.

Encryption and decryption are two sides of the same coin. While the encryption algorithm encodes the data to protect it from unauthorized access, the decryption algorithm ensures that the encoded data can be reverted back to its original form once it is in the hands of someone who is permitted to view it.

On the other hand, a hash algorithm is used to transform data into a fixed-size string of characters, which is typically unique to that specific data, but cannot be easily reversed to retrieve the original input. Compression algorithms, in contrast, are designed to reduce the size of data for storage or transmission efficiency and do not involve encryption or decryption processes. Thus, the correct term to describe the process of reversing an encryption algorithm is the decryption algorithm.