When checking your email over a secure connection, or making a purchase from an online retailer, have you ever wondered how your private information or credit card data is kept secure? Our information is kept away from prying eyes thanks to, which scramble the message so no-one else can read it but its intended recipient. But what are these algorithms, how did they come to be widely used, and how secure really are they? What does this program do acsl albuquerque work. Coded messages The first cryptographic methods actually go back thousands of years to the time of ancient Greece. Indeed, the word “cryptography” is a combination of the Greek words for “secret” and “writing”. For example, the Spartans where they wrapped a piece of papyrus around a staff of a certain girth, and wrote their message down the length of the staff. When the papyrus was unravelled, the message was jumbled until it reached its destination and was wrapped around another staff of the correct circumference.

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Early encryption algorithms like these had to be applied manually by the sender and receiver. They typically consisted of simple letter rearrangement, such a.

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The most famous one is the “”, which was used by the military commanders of the Roman emperor Julius Ceaser. Each letter in the message was replaced in the encrypted text – the ciphertext – by another letter, which was shifted several places forward in the alphabet. But over time such simple methods have proved to be insecure, since eavesdroppers – called cryptanalysts – could exploit simple statistical features of the ciphertext to easily recover the plaintext and even the decryption key, allowing them to easily decypher any future messages using that system. Crytography has come a long way since the days of cypher disks like this one., Modern computing technology has made it practical to use far more complex encryption algorithms that are harder to “break” by cryptanalysts.