The document discusses cryptography, a technique for secure communication against adversaries, highlighting types of encryption based on algorithms and key types. It covers various encryption methods, including two-way (Caesar cipher) and one-way (MD5 hash), along with concepts like salting and steganography. The major applications of cryptography include cryptocurrency, password security, and secure communications such as SSL.

1. Cryptography
on cloud
Pamela Banerjee
Prashant Kumar

2. What is Cryptography?
Cryptography is technique for secure communication in the
presence of third parties called adversaries.

3. Type of Encryption
On basis of Algorithm
– Two Way Encryption
– One Way Encryption
On basis of key type
– Public Key Encryption
– Private Key Encryption

4. Two Way Encryption
Example:
Message : ABC
Caesar Cipher : DEF
Decrypted Message : ABC

5. One Way Encryption
Message Cipher Text
Example:
Message: ABC
Encrypted (MD5 hash): 902FBDD2B1DF0C4F70B4A5D23525E932

6. Cipher
– Shift Cipher
 Shift original message with n symbol
– Caesar Cipher
 Shift original message with exactly 3 symbol
– Block Cipher
 Exchange the original message with hash table

7. Salting
– Salting is a method of crypto system. Where we mix one extra message known
as salt message with the original message.
Message
Salt
Message
Encryption
Algorithm

8. Steganography
– It is the method of hiding message into a image.

9. Some Famous Cryptography
Algorithm
Crypto Function
– Base 64
– SHA Algorithm
– AES, DES Algorithm
– RC6 Algorithm
Hash function
– Md5
– SHA128

10. Hybrid Cryptography
– Using more then two crypto algorithm in a system is called hybrid cryptography
Base64
Caesar
Cipher
Hybrid
Algorithm

11. Major Application
– Crypto Currency and Blockchain
– Login Password Security’
– Military and secure areas
– Secure communication (Ex: SSL)

12. Thank you
– 2 proposed project idea…..