Encryption Encryption is the process of obscuring information to make it unreadable without special...

Encryption

EncryptionEncryption is the process of obscuring is the process of obscuring information to make it unreadable to make it unreadable without special knowledgewithout special knowledge..

http://en.wikipedia.org/wiki/Encryption

Copyright © 2008 by Helene G. Kershner

Encryption is only a part!

To ensure secrecy of a message one needs To ensure secrecy of a message one needs to be sure :to be sure : the communication is securethe communication is secure it is received by the right “people”it is received by the right “people” it can be decrypted (or decipher)it can be decrypted (or decipher)

In other words, we must In other words, we must verify the integrity verify the integrity and authenticity of a messageand authenticity of a message..

http://en.wikipedia.org/wiki/Encryption


Encryption

Great Idea:Great Idea: A A ciphercipher is an is an algorithm for performing encryptionencryption (and the reverse, (and the reverse, decryptiondecryption) — a series of well-defined ) — a series of well-defined steps that can be followed as a procedure.steps that can be followed as a procedure. a cipher is a processa cipher is a process it is more than a secret codeit is more than a secret code WWII – COLOSSUS, Code TalkersWWII – COLOSSUS, Code Talkers


Encryption

The Government’s Need to Know The Government’s Need to Know

VsVs

The Right to PrivacyThe Right to Privacy

Which should have higher priority?Which should have higher priority?


Encryption

Is this just a government vs the people Is this just a government vs the people type of issue?type of issue?

Why would ordinary citizens be Why would ordinary citizens be interested in encrypting information?interested in encrypting information?


Encryption

While encryption has been used to protect While encryption has been used to protect communications for centuries, until recently communications for centuries, until recently only organizations and individuals with an only organizations and individuals with an extraordinary need for secrecy have made extraordinary need for secrecy have made use of it. use of it.

This changed in the 1970sThis changed in the 1970s

http://en.wikipedia.org/wiki/Encryption http://en.wikipedia.org/wiki/Encryption


Encryption

In the mid-1970s, strong encryption In the mid-1970s, strong encryption emerged from government agencies and emerged from government agencies and moved into the public domain.moved into the public domain.

WHY?WHY?


Encryption

Where is it used if not by the government?Where is it used if not by the government? Encryption is now widely-used in computer Encryption is now widely-used in computer

systems such as systems such as Internet e-commerce, Internet e-commerce, mobile telephone networks and mobile telephone networks and automatic teller machines.automatic teller machines.

http://en.wikipedia.org/wiki/Encryptionhttp://en.wikipedia.org/wiki/Encryption


Encryption Encryption is the process of obscuring information to make it unreadable without special...

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