(Principles of Informatioan security)

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

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

CRYPTO GRAPHIA SECRET WRITING

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 ://www.businessdictionary.com/definition/cryptography.html

Decryption techniques data Encryption & Decryption techniques

What is Data Encryption?

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 https://digitalguardian.com/blog/what-data-encryption

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. https://digitalguardian.com/blog/what-data-encryption

Process ENCRYPTION Plaintext Chipertext DECRYPTION

Availability Confidentiality Integrity

Encryption to be problem solver

Various of Cryptosystems

TRADITIONAL CHIPER CAESAR CHIPER

TRADITIONAL CHIPER CAESAR CHIPER

TRADITIONAL CHIPER CAESAR CHIPER

TRADITIONAL CHIPER CAESAR CHIPER

TRADITIONAL CHIPER MONOALPHABETIC & POLYALPHABETIC

TRADITIONAL CHIPER TRANSPOSITION CHIPER

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

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

MODERN CRYPTOGRAPHY ECB Pi = 0110 0010 0011 1010 1001 K = 1011 1011 1011 1011 1011 XOR= 1101 1001 1000 0001 0010 Geser 1 bit ke kiri = 1011 0011 0001 0010 0100 Notasi Hex = B 3 1 2 4

MODERN CRYPTOGRAPHY ECB Pi = 0110 0010 0011 1010 1001 (623A9) Ci = 1011 0011 0001 0010 0100 (B3124)

Explain Otherwise cryptographic algorithms By traditional or modern