Which of the following is a method for transforming a message into a masked form, together with a way of undoing the transformation to recover the message?

Question

Options

• ACipher
• BCrypTool
• CSteganography
• DMIME

• A
  91% (32)
• B
  3% (1)
• D
  6% (2)

Explanation

A cipher is precisely defined as a method for transforming a message into a masked (encrypted) form along with the reverse transformation (decryption) to recover the original - making A the complete, correct match for the definition given.

Why the others are wrong:

• B. CrypTool is a software application used to learn and demonstrate cryptographic algorithms - it's a tool, not a concept or method.
• C. Steganography hides the existence of a message (e.g., concealing data inside an image) rather than transforming it into a masked form that can be systematically reversed.
• D. MIME (Multipurpose Internet Mail Extensions) is a standard for formatting email attachments and multimedia content - it has nothing to do with encryption or masking.

Memory tip: Think of a cipher as a two-way door - it locks (encrypts) and unlocks (decrypts). The definition in the question literally describes both directions, which is the hallmark of a cipher. If the definition mentions undoing the transformation, the answer is always "cipher."

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