2a776 teknik enkripsi dan dekripsi data sesi2
CRYPTOGRAPH
Y
(Principles of Informatioan
security)
CRYPTOGRAPH
Y
(Principles of Informatioan
security)
CRYPTO GRAPHIA
SECRE
T
WRITIN
G
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
data
Encryption &
Decryption techniques
What is Data Encryption?
Defi nition
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
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
Plaintext
Chipertext
ENCRYPTI
ON
DECRYPTI
ON
Availability
Confidentiality
Integrity
Encrypti
on
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
Y
(Principles of Informatioan
security)
CRYPTOGRAPH
Y
(Principles of Informatioan
security)
CRYPTO GRAPHIA
SECRE
T
WRITIN
G
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
data
Encryption &
Decryption techniques
What is Data Encryption?
Defi nition
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
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
Plaintext
Chipertext
ENCRYPTI
ON
DECRYPTI
ON
Availability
Confidentiality
Integrity
Encrypti
on
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