Discussion
Data encryption techniques are particularly used for ..........
Answer: A
Encryption is used for protecting data in data communication systems.
Encryption converts readable data (plaintext) into an unreadable form (ciphertext) using an algorithm and a key, so that only someone with the right key can decrypt it. Its main purpose is confidentiality: data transmitted over a network, or stored, cannot be read by anyone who intercepts it.
Reducing storage space is the job of compression, not encryption, and encrypted data is often slightly larger. Encryption does not by itself guarantee integrity, which needs hashing or digital signatures, and it certainly does not decrease integrity.
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