Cryptography and network security
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This document provides an overview of cryptography and network security. It discusses what cryptography is, the basic terminology used in cryptography like plaintext, ciphertext, encryption, algorithms and keys. It explains the two main types of cryptographic functions: symmetric key cryptography which uses a single shared key between sender and receiver, and asymmetric key cryptography which uses public and private key pairs. It also outlines two network security models - the model for network security and the network access security model.
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Here are the key differences between symmetric and public key algorithms:
Symmetric key algorithm:
- The same key is used for both encryption and decryption.
- The key must be shared secretly between the two parties communicating.
- Examples include AES, DES, 3DES.
Public key algorithm:
- Two different but mathematically related keys are used - a public key and a private key.
- The public key is used for encryption and can be widely distributed. The private key is used for decryption and is known only to the recipient.
- Even if the public key is known, it is very difficult to derive the private key without special knowledge.
- Examples include RSA, Elgamal,
Computer Security (Cryptography) Ch01
This document discusses computer security and network cryptography. It begins by explaining how organizations can use cryptosystems like symmetric and asymmetric encryption to protect data. Symmetric encryption is faster but requires secure key exchange, while asymmetric encryption uses public and private key pairs. The document then defines cryptography terminology and components like plaintext, ciphertext, encryption, decryption, and cryptanalysis. It describes techniques like substitution and transposition ciphers. The rest of the document discusses encryption models, algorithms, and cryptanalysis methods like ciphertext-only and known-plaintext attacks.
Cryptography : The Art of Secured Messaging
Cryptography is the art of securing messages by encrypting information into an unreadable cipher text format that can only be decrypted by those with the secret key. Modern cryptography techniques are virtually unbreakable. Cryptography is commonly used to protect email, credit cards, and corporate data on the internet. There are two main types of cryptography - symmetric which uses one shared key for encryption and decryption, and asymmetric which uses two mathematically related keys, a public and private key. Cryptography ensures confidentiality, integrity, and authenticity of messages.
PresentationonCRYPTOGRAPHYppt.ppt
This document provides an overview of cryptography. It begins with defining cryptography as the practice of hiding information and discusses its purposes, including authentication, privacy, integrity, and non-repudiation. It then describes the basic architecture and types of cryptography, including secret key cryptography, public key cryptography, and hash functions. The document outlines the process of cryptography and different algorithm types, including public/private key cryptography and hash functions. It concludes by discussing different types of attacks on cryptography and thanking the audience.
PresentationonCRYPTOGRAPHYppt.ppt
This document provides an overview of cryptography. It begins with defining cryptography as the practice of hiding information and discusses its purposes, including authentication, privacy, integrity, and non-repudiation. It then describes the basic architecture and types of cryptography, including secret key cryptography, public key cryptography, and hash functions. The document outlines the process of cryptography and different algorithm types, including public/private key cryptography and hash functions. It concludes by discussing different types of attacks on cryptography and thanking the audience.
Presentationon ON THE TOPIC CRYPTOGRAPHY
This document provides an overview of cryptography. It begins with defining cryptography as the practice of hiding information and discusses its purposes, including authentication, privacy, integrity, and non-repudiation. It then describes the basic architecture and types of cryptography, including secret key cryptography, public key cryptography, and hash functions. The document outlines the process of cryptography and different algorithm types, including public/private key cryptography and hash functions. It concludes by discussing different types of attacks on cryptography and thanking the audience.
Crytography
This document provides an overview of cryptography including its history, components, terminology, types, and applications. Cryptography is the science of securing communications and ensures confidentiality, integrity, and authentication of messages. It has military and civilian applications and relies on techniques from mathematics, computer science, and electrical engineering. The document discusses symmetric and asymmetric key cryptography, describing how symmetric uses a shared key while asymmetric uses public/private key pairs. Digital signatures and certificates are also covered.
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This document provides an overview of cryptography. It defines cryptography as the practice of hiding information and discusses its purposes, including authentication, privacy, integrity, and non-repudiation. The document outlines the basic architecture of cryptography, including secret key cryptography, public key cryptography, hash functions, and types of cryptographic attacks. It describes the processes of public/private key cryptography and different types of cryptographic algorithms.
Cryptography by Durlab Kumbhakar
Cryptography is the practice of hiding information to store or communicate it in a secure way. It allows for confidentiality, integrity, and authentication of messages. There are two main types: symmetric key cryptography which uses a single key for encryption and decryption, and asymmetric key cryptography which uses different public and private keys. Popular symmetric algorithms include AES and DES, while RSA is an example of an asymmetric algorithm. The seminar discussed the components, processes, and applications of cryptography as well as examples of algorithms and common attacks.
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Cryptography and network security
- 1. Cryptography and Network Security Dr.S.Santhi Professor Department of ECE KIT-Kalaignarkarunanidhi Institute of Technology
- 2. Agenda What Is Cryptography? Types of Cryptographic Functions. Network Security Models.
- 3. Cryptography • The art of secret writing. The art of mangling information into apparent unintelligibility in a manner allowing a secret method of unmangling.
- 4. Cryptography Definitions • Messages: – Plaintext – Ciphertext • Ingredients: – Algorithm(s) – Key(s) • Players: – Cryptographer: invents clever algorithms – Cryptanalyst: breaks clever algorithms
- 5. Basic Terminology • Plaintext: original message to be encrypted • Ciphertext: the encrypted message • Enciphering or encryption: the process of converting plaintext into ciphertext • Encryption algorithm: performs encryption • Two inputs: a plaintext and a secret key
- 6. Symmetric Key Cryptography • This private/secret/single key cryptography uses one key • This key is shared by both sender and receiver • if this key is disclosed communications are compromised • It is also called symmetric, parties are equal • It does not protect sender from receiver forging a message & claiming is sent by sender
- 7. Asymmetric Key Cryptography • It uses two keys – Private and Public key • Asymmetric – Both sender and receiver use different keys • It works by the clever use of number theory problems • It complements rather than replaces private key cryptography
- 8. MODELS FOR NETWORK SECURITY • Model for Network Security • Network Access Security Model
- 9. Model for Network Security
- 11. Thank You