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(Principles of Informatioan security)

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Presentation on theme: "(Principles of Informatioan security)"— Presentation transcript:

1 (Principles of Informatioan security)
CRYPTOGRAPHY (Principles of Informatioan security)

2 (Principles of Informatioan security)
CRYPTOGRAPHY (Principles of Informatioan security)

3 CRYPTO GRAPHIA SECRET WRITING

4 definition Art and science of keeping message secure
(Willliam Stallings) The art of protecting information by transforming it (encrypting it) into an unreadable format, called cipher text. Only those who possess a secret key can decipher (or decrypt) the message into plain text. (Vangie Beal) http ://

5 Decryption techniques
data Encryption & Decryption techniques

6 What is Data Encryption?

7 Definition Data encryption translates data into another form, or code, so that only people with access to a secret key (formally called a decryption key) or password can read it

8 Goal https://digitalguardian.com/blog/what-data-encryption
The purpose of data encryption is to protect digital data confidentiality as it is stored on computer systems and transmitted using the internet or other computer networks.

9 Process ENCRYPTION Plaintext Chipertext DECRYPTION

10 Availability Confidentiality Integrity

11 Encryption to be problem solver

12 Various of Cryptosystems

13 TRADITIONAL CHIPER CAESAR CHIPER

14 TRADITIONAL CHIPER CAESAR CHIPER

15 TRADITIONAL CHIPER CAESAR CHIPER

16 TRADITIONAL CHIPER CAESAR CHIPER

17 TRADITIONAL CHIPER MONOALPHABETIC & POLYALPHABETIC

18 TRADITIONAL CHIPER TRANSPOSITION CHIPER

19 MODERN CRYPTOGRAPHY ECB Ci = Ek (Pi) Pi = Dk (Ci)

20 MODERN CRYPTOGRAPHY ECB Pi = 01100010001110101001
Dipecah menjadi 4 bit Kunci (K) = panjangnya 4 bit (1011)

21 MODERN CRYPTOGRAPHY ECB Pi = 0110 0010 0011 1010 1001
K = XOR= Geser 1 bit ke kiri = Notasi Hex = B

22 MODERN CRYPTOGRAPHY ECB Pi = 0110 0010 0011 1010 1001 (623A9)
Ci = (B3124)

23 Explain Otherwise cryptographic algorithms By traditional or modern

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