This document provides an overview of cryptography, including its history, types (symmetric and asymmetric), differences between the types, characteristics, uses, and importance. It discusses how cryptography evolved from a public field to being used secretly by governments during World Wars. It also outlines how demand increased with more widespread computer and communication technology use. The document describes common cryptography techniques like the Caesar cipher and public key encryption. It compares symmetric and asymmetric cryptography and lists examples of cryptography usage such as digital signatures, encryption, and authentication.

2. o INTRODUCTION
o HISTORY
o CONCEPT OF CRYPTOGRAPHY
o TYPES OF CRYPTOGRAPHY
• SYMMETRIC CRYPTOGRAPHY
• ASYMMETRIC CRYPTOGRAPHY
o DIFFERENCE B/W SYMMETRIC
AND ASYMMETRIC
o CHARACTERISTICS
o USES
o CONCLUSION

3. ”

4.  CRYPTOLOGY WAS A PUBLIC FIELD IN THE UNITED STATES
UNTIL WORLD WAR 1
WHEN THE ARMY AND NAVY REALIZED ITS VALUE TO NATIONAL
SECURITY AND
BEGAN WORKING IN SECRET THROUGH THE EARLY 1970’s.
COMPUTERS MORE READILY AVAILABLE AND WHEN DEMAND FOR
ENCRYPTION INCREASED DUE TO FUNDAMENTAL CHANGES IN THE
WAYS AMERICA COMMUNICATED.
THE INCREASE IN DEMAND FOR CRYPTOGRAPHY WAS DRIVEN
BY INDUSTRY INTERESTS LIKE: FINANCIAL SERVICES REQUIRED
SECURE ELECTRONIC TRANSACTIONS NEEDED FOR SECURE
TRADE SECRETSSTORED IN COMPUTERS.
INDIVIDUAL INTERESTS LIKE : SECURE WIRELESS
COMMUNICATION.

5.  50 B.C.- JULIUS CAESAR USES
CRYPTOGRAPHY TECHNIQUE
A THREE WHEEL ENIGMA
MACHINE

8. CRYPTOGRAPHY METHOD IS
PUBLIC KEY ENCRYPTION
WHICH USES TWO
SET OF KEYS ONE KEY IS
PUBLIC WHILE OTHER KEY IS
PRIVATE WHICH IS
DISTRIBUTED ONLY TO THE
INTENDED RECIPIENT OF THE
INFORMATION.

11. IN THIS CRYPTOGRAPHY ONLY ONE KEY IS
USED
ONE KEY:SAME KEY FOR ENCRYPTION AND
DECRYPTION

13. WHEN COMPARED TO SYMMETRIC ,ASYMMETRIC
PROCESS IS SLOW i.e
BECAUSE ITS USES TWO KEYS
 PUBLIC KEY:USED FOR ENCRYPTION
 PRIVATE KEY : USED FOR DECRYPTION

15. SYMMETRIC ASYMMETRIC
 ÓNLY ONE KEY IS USED FOR
ENCRYPTION AND
DECRYPTION
 TWO KEYS ARE USED FOR
ENCRYPTION AND DECRYPTION
 ALGORITHM IS LESS COMPLEX
AND FASTER  ALGORITHM IS MORE COMPLEX
AND SLOWER
 TEXT IS USUAL OR LESS THAN
THE REAL TEXT SIZE
 THE SIZE OF TEXT IS MORE THAN
THE ORIGINAL TEXT SIZE
 MAINLY FOR ENCRYPTION AND
DECRYPTION.CANNOT BE USED
FOR DIGITAL SIGNATURES
 CAN BE USED FOR ENCRYPTION
AND DECRYPTION AS WELL AS
FOR DIGITAL SIGNATURES

16.  SECRECY IN TRANSMISSION
SECRECY IN STORAGE
 AUTHENTICATION
 INTEGRITY
 NONREPUDIATION

17.  ELECTRONIC SIGNATURE.
 ELECTRONIC CASH.
 TIME STAMPING.
 DISK ENCRYPTION.
 SECURE NETWORK COMMUNICATION

18.  CASH WITHDRAWAL FROM ATM
 PAY TV
 EMAIL
 FILE STORAGE
 SECURE WEB BROWSING
 GSM MOBILE PHONE
 WHATSAPP

19.  AS WILL HAVE BECOME
CLEAR,CRYPTOGRAPHY IS LITERALLY
EVERYWHERE, IT PLAYS A QUIET BUT
IMPORTANT ROLE IN MANY DAY-TO-
DAY ACTIVITIES.
 THIS TECHNOLOGY IS A BOON FOR
THE NEXT GENERATION.