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NET 311D Information Security

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Presentation on theme: "NET 311D Information Security"— Presentation transcript:

1 NET 311D Information Security
Networks and Communication Systems Department TUTORIAL 1 (Traditional Ciphers “Character-oriented”)

2 Questions Traditional Ciphers
Networks and Communication Systems Department

3 Q1: Substitution cipher (Caesar)
Encrypt the following texts using the shift (Caesar) cipher with the keys in brackets: “Welcome” (Key=10) GOVMYWO “Open the door” (Key=5) TUJS YMJ ITTW GOVMYWO TUJS YMJ ITTW Networks and Communication Systems Department

4 Q1: Substitution cipher (Caesar) cont.
Networks and Communication Systems Department

5 Q3: Substitution cipher (Monoalphbetic)
Use the following table as the key to encrypt the following texts using the substitution cypher: “Announce it tomorrow” EVVRYVZH BF FRDRWWRX - “DO IT” - JR BF A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Networks and Communication Systems Department

6 Q4: Transposition cipher
The following text was encrypted using the transposition cipher with the following mapping as the key, decrypt the message : Decrypt Encrypt HI SARA I HOPE YOU ARE FINE LOOKING FORWARD TO SEE YOU Cipher Text: SAHRIHOAPIOUEAYFIRNEOOEKLGFIONARRDWSETEOUZYZO

7 Q4: Transposition cipher cont.
Answer HI SARA I HOPE YOU ARE FINE LOOKING FORWARD TO SEE YOU Networks and Communication Systems Department

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