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Introduction to Cryptography I

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Presentation on theme: "Introduction to Cryptography I"— Presentation transcript:

1 Introduction to Cryptography I
Eleftheria Makri

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9 Yes, but…

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12 Exchange key using a secure channel
Sender Receiver Secret Key Secret Key Exchange key using a secure channel Hello Bob! Hello Bob! Encryption &sdA%sdfLL)*$ Decryption Ciphertext

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19 Caesar Cipher Ciphertext: WKH ZHLUG QDPH RI WKH JXHVW OHFWXUHU LV HOHIWKHULD Plaintext: THE WEIRD NAME OF THE GUEST LECTURER IS ELEFTHERIA

20 Vigenère cipher

21 The Rail Fence and Rectangular Substitution Tables
P R H S G L A D I O K U C E N T PRHSGLADISOKUCAEODNOLTCS P U R C H A S E G O L D N I T K PALOOUSDICREALKCGNSSHODT

22 Stream Ciphers and Block Ciphers

23 Stream Ciphers

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25 Block Ciphers

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31 Strength of AES

32 Exchange key using a secure channel
Sender Receiver Secret Key Secret Key Exchange key using a secure channel Hello Bob! Hello Bob! Encryption &sdA%sdfLL)*$ Decryption Ciphertext

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