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Cryptography
This document provides an overview of cryptography. It begins with an introduction and then defines cryptography as the practice of hiding information. The document discusses the purposes of cryptography which include authentication, privacy, integrity, and non-repudiation. It then describes the different types of cryptography including secret key cryptography and public key cryptography. Secret key cryptography uses a single key for encryption and decryption while public key cryptography uses separate public and private keys. The document concludes with a brief discussion of how the type of cryptography used depends on the requirements for speed or secrecy.
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Cryptography
- 1. RAVI KUMAR PATEL JAIPURNATIONAL UNIVERSITY COMPUTER SCIENCE & ENGG. https://www.linkedin.com/in/ravi-kumar-patel- 7a4122116/ https://twitter.com/TheRaviKP
- 2. • Introduction • Whatis Cryptography? • Purpose Of cryptography • Architecture of cryptography • Types of Cryptography • Process of cryptography • Conclusion • References
- 3. • The Internetor the global Internet is the internationally connected network of computer networks with addresses that are administrated by IANA (Internet address and Naming Authority). • There are many aspects to security and many applications, ranging from secure commerce and payments to private communications and protecting passwords. One essential aspect for secure communications is that of cryptography.
- 4. • Cryptography derivedits name from a Greek word called “krypto’s” which means “Hidden Secrets”. • Cryptography is the practice and study of hiding information. It is the Art or Science of converting a plain intelligible data into an unintelligible data and again retransforming that message into its original form. • It provides Confidentiality, Integrity, and Accuracy.
- 5. • Authentication: Theprocess of proving one's identity. (The primary forms of host-to-host authentication on the Internet today are name-based or address-based, both of which are notoriously weak.) • Privacy/confidentiality: Ensuring that no one can read the message except the intended receiver. • Integrity: Assuring the receiver that the received message has not been altered in any way from the original. • Non-repudiation: A mechanism to prove that the sender really sent this message.
- 7. Secret Key Cryptography •Single key used to encrypt and decrypt. • Key must be known by both parties. • Assuming we live in a hostile environment (otherwise - why the need for cryptography?), it may be hard to share a secret key.
- 8. • One ofthe keys allocated to each person is called the "public key", and is published in an open directory somewhere where anyone can easily look it up, for example by email address. • Each entity has 2 keys: • Private Key (a secret) • Public key (well known).
- 9. Private keys areused for decrypting. Public keys are used for encrypting.
- 11. • We usedifferent types of algorithms to establish security services in different service mechanisms. • We use either private key cryptography or public key cryptography according to requirement. • If we want to send message quickly we use private key algorithm and if we want to send messages secretly we use public key algorithm.