Encryption and its Importance in Everyday Life
CH 6 – SIMPLE ENCRYPTION
REVIEW PRIVACY POLICIES
OBJECTIVES:
I WILL BE ABLE TO…
•
Explain why encryption is an important need for everyday life on the
Internet.
•
Crack a message encrypted with a Caesar cipher using a Caesar
Cipher Widget
•
Crack a message encrypted with random substitution using Frequency
Analysis
•
Explain the weaknesses and security flaws of substitution ciphers
WHAT IS ENCRYPTION?
•
Encryption
is a process - an algorithm - for transforming a message
so that the original message is hidden from anyone who is not the
intended recipient. This is often called a “secret code.”
•
Reversing the encryption process to reveal the original message is
called
decryption
.
•
Encryption is not just for the military and spies anymore. We use
encryption everyday on the Internet, primarily to conduct
commercial transactions, and without it our economy might grind to
a halt.
VOCABULARY
•
Encryption
- a process of encoding messages to keep them secret,
so only "authorized" parties can read it.
•
Decryption
- a process that reverses encryption, taking a secret
message and reproducing the original plain text
•
Cipher
- the generic term for a technique (or algorithm) that
performs encryption
VOCAB PART DEUX
•
Caesar Cipher
- a technique for encryption that shifts the alphabet
by some number of characters
•
Random Substitution Cipher
- an encryption technique that maps
each letter of the alphabet to a randomly chosen other letter of the
alphabet.
•
Cracking encryption
- When you attempt to decode a secret
message without knowing all the specifics of the cipher, you are
trying to "crack" the encryption.
HOW DOES THIS WORK?
•
Computational tools dramatically increase the strength and
complexity of the algorithms we use to encrypt information, but
these same tools also increase our ability to crack an encryption.
Developing strong encryption relies on knowledge of problems that
are “hard” for computers to solve, and using that knowledge to
encrypt messages.
THE CAESAR CIPHER
•
Decode
: serr cvmmn va gur pnsrgrevn
•
“free pizza in the cafeteria” – each letter shifted 13
characters
•
Code studio widget – Caeser Cipher
RANDOM SUBSTITUTION WIDGET
•
Continue with lesson 5
HOMEWORK
•
Read Ch 5 in Blown to Bits: link in unit 4 lesson 5
Encryption is a crucial process that transforms messages into secret codes, ensuring only intended recipients can decipher them. This review delves into the significance of encryption for online activities, cracking different cipher methods, and recognizing security flaws. Discover how computational tools enhance encryption complexity while also amplifying decryption abilities.
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Presentation Transcript
CH 6 SIMPLE ENCRYPTION REVIEW PRIVACY POLICIES
OBJECTIVES: I WILL BE ABLE TO Explain why encryption is an important need for everyday life on the Internet. Crack a message encrypted with a Caesar cipher using a Caesar Cipher Widget Crack a message encrypted with random substitution using Frequency Analysis Explain the weaknesses and security flaws of substitution ciphers
WHAT IS ENCRYPTION? Encryption is a process - an algorithm - for transforming a message so that the original message is hidden from anyone who is not the intended recipient. This is often called a secret code. Reversing the encryption process to reveal the original message is called decryption. Encryption is not just for the military and spies anymore. We use encryption everyday on the Internet, primarily to conduct commercial transactions, and without it our economy might grind to a halt.
VOCABULARY Encryption - a process of encoding messages to keep them secret, so only "authorized" parties can read it. Decryption - a process that reverses encryption, taking a secret message and reproducing the original plain text Cipher - the generic term for a technique (or algorithm) that performs encryption
VOCAB PART DEUX Caesar Cipher - a technique for encryption that shifts the alphabet by some number of characters Random Substitution Cipher - an encryption technique that maps each letter of the alphabet to a randomly chosen other letter of the alphabet. Cracking encryption - When you attempt to decode a secret message without knowing all the specifics of the cipher, you are trying to "crack" the encryption.
HOW DOES THIS WORK? Computational tools dramatically increase the strength and complexity of the algorithms we use to encrypt information, but these same tools also increase our ability to crack an encryption. Developing strong encryption relies on knowledge of problems that are hard for computers to solve, and using that knowledge to encrypt messages.
THE CAESAR CIPHER Decode: serr cvmmn va gur pnsrgrevn free pizza in the cafeteria each letter shifted 13 characters Code studio widget Caeser Cipher
RANDOM SUBSTITUTION WIDGET Continue with lesson 5
HOMEWORK Read Ch 5 in Blown to Bits: link in unit 4 lesson 5
