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SOURASHTRA COLLEGE
CRYPTOLOGY
BY
L.S.KARNAN
II YEAR
B.Sc., Maths
 Cryptology is the Study of ‘’Secret Writings’’.
 Modern Cryptology combines the studies of Computer Science
and Mathematics for the purpose of Encoding information to
ensure that data is secure.
 It comes from the Greek words Kryptos, meaning hidden and Graphen,
meaning to write.
 Invisible ink is a good example.
CRYPTOLOGY
Encryption: c = Ee(p)
Decryption: p = Dd(c)
 Here p is a block of plaintext,
c is a block of ciphertext,
E is the encryption function,
e is the encryption key,
D is the decryption function and
d is the decryption key.
CRYPTOGRAPHY:
MATHS
Encryption
NZGSH
Decryption
MATHS
Example:
Plain text
Cipher textPlain text
NZGSH
Cipher text
A B C D E……………Y Z
26 25 24 23 22…………... 2 1
1 2 3 4 5……………25 26 FORWARD NUMBER
FORWARD LETTER
BACKWARD NUMBER
M - 14 - N vice - versa
A - 26 - Z
T - 07 - G
H - 19 - S
S - 08 - H
B.N F.L
For DecryptionFor Encryption
CODING METHOD :
Cryptography is the art and
science of creating secret codes.
Cryptanalysis is the art and
science of breaking those code.
CRYPTANALYSIS:
1.Now-a-days, internet is very insecure
therefore cryptology method is
followed to safeguard to transmit data.
2.It is used in ATM centre.
3.It is used in World War-II
USES:
-Takes a long time to figure out the code.
-It takes long to create the code.
-OVERALL CRYPTOLOGY IT'S A
LONG PROCESS.
LIMITATIONS:
CRYPTOLOGY

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CRYPTOLOGY

  • 2.  Cryptology is the Study of ‘’Secret Writings’’.  Modern Cryptology combines the studies of Computer Science and Mathematics for the purpose of Encoding information to ensure that data is secure.  It comes from the Greek words Kryptos, meaning hidden and Graphen, meaning to write.  Invisible ink is a good example. CRYPTOLOGY
  • 3.
  • 4. Encryption: c = Ee(p) Decryption: p = Dd(c)  Here p is a block of plaintext, c is a block of ciphertext, E is the encryption function, e is the encryption key, D is the decryption function and d is the decryption key. CRYPTOGRAPHY:
  • 5.
  • 7. A B C D E……………Y Z 26 25 24 23 22…………... 2 1 1 2 3 4 5……………25 26 FORWARD NUMBER FORWARD LETTER BACKWARD NUMBER M - 14 - N vice - versa A - 26 - Z T - 07 - G H - 19 - S S - 08 - H B.N F.L For DecryptionFor Encryption CODING METHOD :
  • 8. Cryptography is the art and science of creating secret codes. Cryptanalysis is the art and science of breaking those code. CRYPTANALYSIS:
  • 9. 1.Now-a-days, internet is very insecure therefore cryptology method is followed to safeguard to transmit data. 2.It is used in ATM centre. 3.It is used in World War-II USES:
  • 10. -Takes a long time to figure out the code. -It takes long to create the code. -OVERALL CRYPTOLOGY IT'S A LONG PROCESS. LIMITATIONS: