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Stream Ciphers

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  T RIPOLI U NIVERSITY F ACULTY O F E NGINEERING C OMPUTER D EPARTMENT Presented by: Azer Mohammed Eldukali Supervisor: Dr. Mehdi Elhafi 1 Stream Ciphers  2 P RESENTATION O VERVIEW  Introduction  Difference between Block Cipher and Stream Cipher   Stream Cipher  Example  3 I NTRODUCTION The literature divides the symmetric ciphers into two broad categories: stream ciphers and block ciphers.Typical stream cipher encrypts plaintext one byte at a time.Modern stream ciphers are divided into two broad categories: synchronous and nonsynchronous.  4 D IFFERENCEBETWEEN B LOCK C IPHERAND S TREAM C IPHER The main difference between Block cipher and Stream cipher is that block cipher converts the plain text into cipher text by taking plain text’s block at a time. While stream cipher converts the plain text into cipher text by taking one byte of plain text at a time.
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