Secrecy in the Digital Age Lecture
Venue: Physics Lecture Theatre C
Audience: Years 10 -12
Subject Area: Computer Science
Places Available: 35
Confidential communication has evolved through ages. Now we use encryption algorithms for this. An encryption algorithm is a mechanism for hiding information to be sent in hostile environments.
One method of doing this was in year in 499 B.C. when the Greeks conspired to revolt against the Persians by sending messages via an ingenious “protocol”.
The Greeks tattooed the secret message on the shaved head of a slave! When the hairs grew back, the slave was sent to deliver the message. The recipient could read the message by shaving the slave's head again.
In this captivating lecture, we discuss the principles of modern cryptography and how they can be used to keep data secret from anyone except the intended receiver.
We will also discuss visual cryptography, which can hide information in images that look completely random but can be decrypted by the human eye if the correct key is used. The Internet makes it easy to communicate and access information, but sometimes it is important that we can keep some information confidential (e.g., when using credit cards on the net).
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