Sunanda cryptography ppt
- 1. SRINIVASA INSTITUITE OF TECHNOLOGY & SCIENCE
- 2. CRYPTOGRAPHY & NETWORK SECURITY Presented By S.Sunanda
- 3. Contents •Cryptography Techniques Encryption & Decryption Categories Of Cryptography Traditional ciphers RSA algorithm Applications
- 4. Contd….. • Network Security What is Network? About Network Security Security Goals Objective Of Security Data Security Problems & Attacks Threats Conclusion
- 5. CRYPTOGRAPHY It is derived from the Greek word that meant for secret writing. Cryptography is a Software or hardware programs use Mathematical Functions , Formulas(Algorithms) to change text from one from to another. Cryptography is the science and art of transforming messages to make them secure and immune to attacks. It provides Confidentiality, Integrity, Accuracy. Applications of cryptography includes ATM cards, Computer passwords . It’s very useful to our Army & Police network to transfer confidential data
- 6. TECHNIQUES The data is transferred by applying two techniques 1. Encryption 2. Decryption Encryption: The way of converting the plain text to the Cipher text by the means of few keys is called as the” Encryption”. Decryption: The way of converting the Cipher text to the Plain text by the use of keys that are suitable to it is called as ”Decryption”.
- 9. SYMMETRIC KEY CRYPTOGRAPHY The implementation of a simple cryptography using single key is done by the Secret-key algorithms. Also known as SECRET KEY CRYPTOGRAPHY. Sender & Receiver uses same key and an Encryption/ Decryption Algorithm to Encrypt / Decrypt data.( i.e ) The Key is shared This can be done by p-box, s-box and product cipher
- 12. SUBSTITUTION CIPHER Replacing of each letter or group of letter or group of letters of plain text into cipher text by another letter is called as “Substitution cipher”. The substitution may be: Monalphabetic Substitution Polyalphabetic Substitution
- 13. TRANSPOSITION CIPHER The change offered in The position of the text i.e. By jumbling the Words is called as ” Transposition Cipher”. And the technique used here is termed as ”Mass Technique”.
- 14. ASYMMETRIC KEY CRYPTOGRAPHY Also known as PUBLIC KEY CRYPTOGRAPHY . Sender & Receiver uses different keys for Encryption & Decryption namely PUBLIC & PRIVATE respectively.
- 15. RSA ALGORITHM RSA is derived from the names of the discoverers named Rivest, Shamir, Adleman. The RSA algorithm is one of the widely used in the key algorithms. 1. The main function of this algorithm is providing approach to public key cryptography & Encryption 2. In this the CIPHER TEXT are the integer’s between 0 and n-1
- 17. APPLICATIONS • Defense Services • Secure Data Manipulation • E- Commerce • Business Transactions • Internet Payment Systems • User Identification Systems • Access Control • Data Security
- 18. WHAT IS NETWORK ? A network is an interconnection or a media between two or more systems to share information among them. The various threats caused to network are: * Remote login * Operating System Bugs *Spams & viruses etc.
- 19. NETWORK SECURITY • The security provided to the network is called network security which at present is looming on horizon as a massive problem. • There are two kinds of Network Security mainly as: Transit security : It just encrypts the packets to be transferred Traffic Security: It acts just as a screen between hosts & remote sites
- 20. SECURITY GOALS
- 21. OBJECTIVE OF SECURITY To avoid data threats To avoid denial of services To secure our data from masquerades To safeguard our data’s from traffic analyzer To not to make message for the third person available
- 22. PASSWORD AUDITING Should not be in uppercase Must have at least 8 characters Must include alphabets, numeric keys & special characters Password should not be the name of the user, dictionary word etc., It must be updated at least once a month
- 23. DATA SECURITY • To monitor the user’s ACCESS CONTROLS • System that are connected in network must be protected with firewalls • To protect the integrity & availability of the institution’s information asset’s
- 24. PROBLEMS & ATTACKS There are few intertwined areas in network security as: Secrecy Authentication Non-Repudiation Integrity control etc. The threats are classified into two categories: Passive Attacks: A passive attack is one in which the attacker eavesdrops and listens to the message but can’t modify the message.
- 25. • Active Attacks: An active attack is one in which the attacker modifies, deletes, replay or introduce new messages into the stream of message. THREATS
- 26. CONCLUSION However, through this Cryptography & Network Security We Successfully hiding and secure the data with the help of Encryption & Decryption.
- 27. “ For every lock there is a key….. It is better to keep safe your lock than the key”