been concealed from any eavesdroppers. You know that the
content of the message has not been changed. You also know
that the message comes from a person who has the right to
send such a message in the sender’s name. This message is
unquestionably authentic. The bad guys haven’t gotten to you.
Encryption Algorithms
An encryption algorithm is a method for transforming ciphertext
into plaintext and back again. Algorithms range from the sim-
ple (A=1) to the horrendously complicated. Some algorithms
that are more resistant to cryptanalysis than others are called
“better” or “stronger” than algorithms that a cryptographer ...
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