In
cryptography
Cryptography, or cryptology (from grc, , translit=kryptós "hidden, secret"; and ''graphein'', "to write", or ''-logia'', "study", respectively), is the practice and study of techniques for secure communication in the presence of adve ...
, message forgery is sending a message so to deceive the recipient about the actual sender's identity. A common example is sending a
spam or prank e-mail as if it were originated from an
address other than the one which was really used.
See also
* Authentication
*
Message authentication code
In cryptography, a message authentication code (MAC), sometimes known as a ''tag'', is a short piece of information used for authenticating a message. In other words, to confirm that the message came from the stated sender (its authenticity) and ...
*
Stream cipher attack
Stream ciphers, where plaintext bits are combined with a cipher bit stream by an exclusive-or operation (xor), can be very secure if used properly. However, they are vulnerable to attacks if certain precautions are not followed:
*keys must never ...
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Cryptographic attacks
Practical jokes