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Abdurrahman Alokeily

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Title: Abdurrahman Alokeily

1
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Presented By Abdurrahman Alokeily
422001218 Esmaeel Alqahtany 427101566
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6
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?? ??????? ???????? ???????? ?? ?????? ?????? ??
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??? ??????? ????? (???? ??????? ????????) ????
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??????.
7
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?? ??????? (?????????) ??? ??????? ???????? ???
???????? ????????? ????? ?? (??????) ?????? ??
?????? ??????? ???????? ?(???????????) ???? ???
(???????) ??????? ?? ?????????? ???? ?????
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???? ?? "??????" ???? ???? ??? ??????? ??????
???????? ????????? "???? ????? ??????".
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??? ?? ???? ?????? ?????? ????????? ???? ????
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?????.
8
. ?????? ???? ?????? ??? ??? ??????? ???????
???? ??????? ??? ??? ??????? ??? . ???????
???????? (Symmetric Encryption) . ??????? ???
???????? ((Asymmetric Encryption
??????? ???? ?? ??? ??????? . Plaintext
???? ??? ??????? . Ciphertext ???? ??? ??????? .
Cipher ????? ?? ???????? ??????? . Key??????? ??
?????? ?????? ????? ??????? ????? ??????? ???????
. Encipher (encrypt) ????? . Decipher ??
??????? . Cryptography ????? ?????? ???????
??????? . Cryptanalysis ?? ?????? ????????? ????
????? ??????? . Cryptology ??? ???????
9
??????? ???????? ?? ????? ??????? ????? ??
???? ????? ????? ???? ??? ??????? ??????? ??????
????????? ??? ?????? ??? ??????? ???? ??????
???? ??? ????? ??????? ?????. ???
?????? Caesar Cipher ?????? ???????? ???
??????? ABCDEFGHIJKLMNOPQRSTUVWXYZ ??????
???????? ????? DEFGHIJKLMNOPQRSTUVWXYZABC ?????
??????? ??? ??????? ??????? D(Letter)Letter3
??? ??????? E(Letter)Letter-3
10
??????? ??? ???????? ??? ??????? ????????
?????? ???????? ??? ????? ?? ????? ????? ???
??????? ??????? ????? ???????? ???????? ????????
??????? ????? ?????? ???? ???????? ???????
??????? ??????? ?? ??? ??????? ??? ?? ???????
??????? ???????? ???? ?? ???? ??????? ?????
???. ??????? ??????? Public Key ??????? ?????
Private Key ??? ?????? ????? ???? ?????? ????
?? ????? ??? ??????? ????? ???????. ??? ???
????? Block Cipher . ????? ??? ??????? ??? ???
??????? ??? DES Stream Cipher . ????? ?? ??
?????? ??? ??? ??? RC4
11
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?????
????? ????? ??????? ??? ????? ??????? . ?????
??????? ????? ???? ???? ?? ???? ?????????
??????? ????? ????? ??? ????? ?????? ?????? ?????
????? ?????? ???????. . ??????? ????? ???????
???? ????? ?????. ??? ????? ?????? ???????
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???????? ????? ?? ?????? ??? ?????? ???????
??????? ?????? ???????? ??? ?????? ??????? ?????
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12
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??????? ??? ????? ????????
???? ??? ??????? ?????? ????? ????? ????
???????? ??? ?? ?????? ????? ????? ??????
????? ???? ??? ??????? ?????? ???
???????? Caesar Cipher???? ???????? ??? ????
?? ??? ?????? ?????? ???? ????? ????? ??? ???
??????? ??? ?????? ??????? ????? ???????.
?????? ???? ??? ??????? ?????? ??? ????? ????
???????? ??? ?????? ??????? ?????? ????? Caesar
Cipher?? ????? ???? ??????? ?? ??? ???? ?? ???
?????? ?????? ???? ????? ????? ??? ??? ???????
??? ?????? ??????? ????? ???????.
13
?????? ??????? ??????? ??????? ????? ????
???????? ??? ?????? ??????? ??????? ????? ??????
????? ?? ??????? ??? ?????? ??????? ?????? ??????
Caesar Cipher?? ????? ???? ??????? ?? ??? ????
?? ??? ?????? ?????? ???? ????? ????? ??? ???
??????? ??? ?????? ??????? ????? ???????.

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