TAILIEUCHUNG - Introduction to Encryption I

Since this course is an introduction to encryption, we should cover what it is. Cryptography means “hidden writing”, and various forms of hidden writing have been used throughout history. One of the main goals of cryptography is to communicate with another party in such a way that if anyone else is listening, they cannot understand what you are saying. So, in its most basic form cryptography garbles text in such a way that anyone that intercepts the message cannot understand it. | Introduction to Encryption I SANS GIAC LevelOne Security Essentials Introduction to Encryption I SANS GIAC LevelOne 2000 2001 1 Hello welcome to Introduction to Encryption I. Several people contributed to this course including Harish Bhatt Stephen Northcutt Mark Kern and Eric Cole. This is one of the most important classes we have the privilege to teach as part of GIAC. Encryption is real it is crucial it is a foundation of so much that happens. I guess you know that one of the SANS mottos is never teach anything in a class the student can t use at work the next day. One of our goals in this course is to help you be aware of how cryptography is used in our world. But we are going to share a lot of hard earned pragmatic lessons and we hope they will help you. Without cryptography there is no ecommerce no military presence on the Internet and no privacy for the citizens of the world. Encryption plays a key role in the current security landscape and anyone that works in the field of security must have a good understanding of what encryption is and how it works. 5 - 1 What is cryptography Cryptology means hidden writing . Encryption is coding a message in such a way that its meaning is concealed. Decryption is the process of transforming an encrypted message into its original form. Plaintext is a message in its original form. Ciphertext is a message in its encrypted form. Introduction to Encryption I SANS GIAC LevelOne 2000 2001 2 Since this course is an introduction to encryption we should cover what it is. Cryptography means hidden writing and various forms of hidden writing have been used throughout history. One of the main goals of cryptography is to communicate with another party in such a way that if anyone else is listening they cannot understand what you are saying. So in its most basic form cryptography garbles text in such a way that anyone that intercepts the message cannot understand it. An excellent source to get a better appreciation for this field of .

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