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Information Security & Cryptography

This document provides an overview of information security and cryptography. It discusses objectives of security like avoiding data threats. It also covers topics like password auditing, data security, authentication, encryption, decryption, public and private key cryptography, digital signatures, and the RSA algorithm. It demonstrates an example of encrypting a message using RSA and decrypting the cipher text. The conclusion emphasizes the importance of information security.

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It's a Presentation from THIAGARAJAR POLYTECHNIC COLLEGE (Autonomous Institution) Salem - 5
Information Security & Cryptography
Presented & performed by Ranjith. B Arunachalam. PL COMPUTER ENGINEERING
INFORMATION SECURITY OBJECTIVES OF SECURITY PASSWORD AUDITING DATA SECURITY AUTHENTICATION CRYPTOGRAPHY Encryption and Decryption Public & Private Key Cryptography Digital signatures RSA ALGORITHM DEMONSTRATION CONCLUSION Synopsis
INFO SECURITY -> a small intro… Why it is needed ? Where ? How?
OBJECTIVES 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 the message for the third person available
PASSWORD AUDITING Should not be in uppercases Must have at least 8 characters Must include alphabets, numeric keys and special characters Password should not be the name of the user, dictionary word etc., It must be updated at least once a month
DATA SECURITY To monitor the users ACCESS CONTROLS Systems that are connected in networks must be protected with FIREWALLS To protect the integrity and availability of the institution’s information assets
CYPTOGRAPHY -> small intro… KEYWORDS Cryptography Encryption & Decryption Public Key Cryptography Private Key Cryptography Digital Signatures RSA Algorithm
Cryptography is the science of using mathematics to encrypt and decrypt data. Cryptography enables you to store sensitive information or transmit it across insecure networks (like the Internet) so that it cannot be read by anyone except the intended recipient. Its very usefull to OUR Army and Police networks to transfer confidential datas. Cryptography
ENCRYPTION AND DECRYPTION Encryption is a technique that converts the original text into an unreadable text The converted original text is called as CIPHER TEXT Decryption technique is used to convert the cipher text into the original text Authentication is the verification process which identifies the password and username Digital signatures are signed to make the cipher text into unreadable or unchangeable
Principles of public key system John’s public key John Annie plaintext cipher text Dec.ALG Enc.ALG plaintext
The SD3 Security Framework Secure by Design Secure by Default Secure in Deployment Build threat models Conduct code reviews Run code with minimal privileges Minimize your attack surface Enable services securely Leverage the security best practices Create security guidance Build tools to assess application security The Secure Windows project team at Microsoft has adopted a simple set of tactic called SD3. Minimize your attack surface Enable services securely Minimize your attack surface Enable services securely
Published in 1978 by MIT, US The main function of this algorithm is to providing approach to public key cryptography and encryption In this the CIPHER TEXT are all the integers between 0 to n-1 C = m e mod n m = c d mod n = (me)d mod n = med modn RSA Algorithm m -> message e -> encryption d -> decryption n -> integers (p*q) P and Q are the prime numbers
Decryption Algorithm Message Source Encryption Algorithm Destination Crypt. Analyst Key Pair Source X Y X PR a PR a PU a X=E(PR ,X) a X=D(PU ,Y) a X=WELCOME Y=5370379 Principles of public key system -> a DEMONSTRATION
Conclusion
This Paper has been submitted under the guidance of Over headed by M.Saravanan (M.E) – Lecturer (Computer Tech). PL.Sindhu B. E – Lecturer (Computer Tech). MR.D.ARUL SELVAN M.E., Head Of the Department / Computer Technology
“ Thank You” “ For every lock there is a Key… It is better to KEEP SAFE YOUR LOCK THAN THE KEY”
Bibliography References CCNA INTRO - Wendell Odom Network Essentials – William Stalings Website www.wikipedia.com www.securitymeasures.com