Chapter1Notes - Introduction to Cryptology Relevant...

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Introduction to Cryptology Relevant Definitions: Plaintext: A message in plain English or any other standard language that the public can understand. Encryption: The process of disguising a message to hide its substance. Typically, this does NOT include hiding the fact that a message is sent, which is known as stenography. Ciphertext: The output of encrypting a plaintext message. Decryption: The process of recovering the plaintext from the ciphertext using a secret key that only the receiver (and maybe the sender) has. Cryptology: The science (and art) of building and analyzing different encryption-decryption methods. Cryptography: The science of building more powerful and efficient encryption techniques. Cryptanalysis: The science of discovering weaknesses in existing methods so that the plaintext can be recovered without knowledge of the key. Steganography: The science of message hiding, ie. using invisible ink, etc. Code: Substitutes words and phrases in the plaintext for numbers. No algorithm nor key is necessary, only a codebook that has an exhaustive list of every substitution. Cipher: Uses an algorithm and key to hide information.
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Our Soap Opera: One Life to Live, Days of Our Lives, … sorry just kidding, besides this class meets while both of those are on, I think! No, really, our soap opera involves Alice and Bob (who are madly in love, though our book doesn't tell us this), and Eve (who as history tells us, is pure evil ). Alice and Bob are sending
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Chapter1Notes - Introduction to Cryptology Relevant...

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