Network Security and Cryptography
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This document provides an overview of network security and cryptography. It discusses risk factors for cryptography systems, authentication and key establishment, types of security attacks, security services, secret key cryptography, and types of firewalls. The document also covers network security models and future work. It notes that network security aims to provide data confidentiality, integrity, authenticity, non-repudiation, and access control when transferring information over networks. Cryptographic techniques like AES encryption are used to secure communications from attacks. Different types of firewalls can operate as positive or negative filters to control packet flow.
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or alert against any danger. Network security is the condition of
being protected against any danger or loss. Thus safety plays a
important role in bank transactions where disclosure of any data
results in big loss. We can define networking as the combination
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Resources here include files, database, emails etc. It is the
protection of these resources from unauthorized users that
brought the development of network security. It is a measure
incorporated to protect data during their transmission and also
to ensure the transmitted is protected and authentic.
Security of online bank transactions here has been
improved by increasing the number of bits while establishing the
SSL connection as well as in RSA asymmetric key encryption
along with SHA1 used for digital signature to authenticate the
userE-commerce- Security & Encryption
This document discusses dimensions of e-commerce security including integrity, non-denial, authenticity, confidentiality, privacy and availability. It also outlines security threats such as malicious code, phishing, hacking and credit card fraud. Finally, it describes various technology solutions for protecting internet communications through encryption, securing communication channels using SSL and VPNs, protecting networks with firewalls, and protecting servers and clients with access controls and anti-virus software.
Network security protocols.pptx
Network security protocols play a vital role in securing digital communication and establishing trust online. They provide encryption, authentication, access controls and other functions to protect data confidentiality, integrity and availability. Common protocols like TLS/SSL, IPsec, SSH ensure sensitive information is securely transmitted, while firewalls and VPNs control network traffic flow. Regular software updates, access controls and user awareness are important aspects of network defense. Recent incidents like the massive Yahoo breach demonstrate the consequences when security is insufficient and underscore the ongoing need for robust protocols and vigilance against cyber threats.
Networking infrastructure
Network security involves protecting network assets and operations from threats like viruses, Trojan horses, and data interception. Key network security tools include antivirus software, firewalls, intrusion detection systems, VPNs, encryption, and identity services. There are two approaches to security - an open door approach that grants access by default and a close door approach that denies access by default. VLANs (Virtual Local Area Networks) logically group network nodes to reduce broadcast traffic and allow more granular security policies between groups.
fundamental of network security
Communication networks are used to transfer valuable and confidential information for a variety of purposes. As a consequence, they attract the attention of people who intend to steal or misuse information, or to disrupt or destroy the systems storing or communicating it.
CNS - Chapter1
This document provides an overview of cryptography and network security concepts from the textbook "Cryptography & Network Security" by William Stallings. It covers topics like confidentiality, integrity, availability, security threats/attacks, security services, security mechanisms, and the OSI security architecture. The document includes chapter objectives, definitions of key terms, descriptions of security concepts, examples, and review questions. The overall purpose is to introduce fundamental cryptography and network security principles.
Seminar (network security)
This document discusses network security. It covers topics such as why security is important given that the internet was initially designed for connectivity. It describes different types of security including computer, network, and internet security. It discusses security goals and common attacks targeting different layers such as IP, TCP, and DNS. The document also outlines security measures like firewalls, intrusion detection systems, access control, cryptography, public key infrastructure, and IPSec. It concludes with security management topics such as risk management and the Whois database.
Secrity project keyvan
1. Cryptography is used to provide security in electronic commerce by ensuring privacy, authenticity, and preventing forgery, alteration, eavesdropping and tracing of messages.
2. There are two main types of cryptography - symmetric which uses the same key for encryption and decryption, and asymmetric (public key) which uses different keys for encryption and decryption.
3. Common symmetric algorithms are DES and AES while RSA is an example of an asymmetric algorithm commonly used for digital signatures and encryption.
Aspects of Network Security
This document discusses various aspects of network security. It outlines four key aspects:
1) Privacy - ensuring confidentiality of messages by encrypting transmissions so only the intended recipient can understand them.
2) Message integrity - ensuring data arrives at its destination exactly as sent with no changes, which is important for financial transactions.
3) Endpoint authentication - authenticating the identity of the sender to prevent impersonation.
4) Non-repudiation - providing proof of transmission to prevent senders from denying messages.
The document also discusses three levels of network security controls: physical, technical, and administrative. Physical controls restrict access to network infrastructure. Technical controls protect stored and transmitted data. Administrative controls manage user
امن نظم المعلومات وامن الشبكات
This document provides an overview of information security topics including:
- Types of security attacks such as those from internal and external attackers.
- Key security concepts like confidentiality, integrity, and availability.
- Examples of security violations involving unauthorized access or modification of files.
- The importance of considering security attacks, mechanisms, and services as major axes in network security.
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Enhancement in network security with security protocols
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IMPLEMENTATION OF METHODS FOR TRANSACTION IN SECURE ONLINE BANKING
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みなさんこんにちはこれ何文字まで入るの？40文字以下不可とか本当に意味わからないけどこれ限界文字数書いてないからマジでやばい文字数いけるんじゃないの？えこ...
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Network Security and Cryptography
- 1. By G. MANJUNATH, BCA III Year
- 2. Introduction Risk Factors for Cryptography Systems Authentication and Key Establishment Types of Security Attacks Security Services Network Security Model Secret Key Cryptography Types of Firewalls Future Work Conclusion
- 3. Cryptography is the study of secret (crypto-) writing (-graphy) It verifies the correctness of a message to the recipient (authentication) 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 Application Backdoors SMTP Session Hijackings Operating System Bugs Spams Viruses etc.
- 4. There is no simple formula for determining how safe a specific cryptosystem is from attacks and potential security compromises. The Following Factors Affect The Risk Of Successful Attacks On Cryptosystems: Symmetric Key Length Public Key Lifetimes Amount Of Plaintext Known To Attackers Strength Of The Security Implementation Randomness Of Generated Keys Strength Of The Security Protocols
- 5. Risk Impact Damage Potential No. of Affected Components Possibility Degree Of Migration Ease Of Exploitation Discoverability Exploitability Reproducability
- 6. Authentication and key establishment are foundational for establishment of secure communication channels. There exists a variety of authentication protocols for different applications and with different security guarantees. The Authentication techniques such as private keys, passwords, or biometric data, and more sophisticated security properties such as leakage resilience or robustness.
- 7. The are few intertwined in network security as : Secrecy Authentication Non - Repudation Integrity Control etc Theards are classified in two categories : Passive Attacks - eavesdropping on, or monitoring of, transmissions to: obtain message contents, or monitor traffic flows Active Attacks – modification of data stream to: masquerade of one entity as some other replay previous messages modify messages in transit denial of service
- 8. It is a service that is provided by a protocol layer of communicating and security systems or data transmission. It enhances the security of data processing and transferring. Data Integrity Data Confidentiality Authenticity Non - Repudiation Access Control
- 9. A message is to be transferred from one part of Internet service. A security-related y to another across some sort of transformation on the information to be sent. Message should be encrypted by key so that it is unreadable by the opponent An encryption key used in conjunction with scramble the message before transmission and unscramble it on reception
- 10. AES was designed to be efficient in both hardware and software. AES comprises three block ciphers, are AES-128, AES-192 and AES-256. Each cipher encrypts and decrypts data in blocks of 128 bits using cryptographic keys of 128-, 192- and 256-bits. AES is largely considered impervious to all attacks, with the exception of brute force. Security experts believe that AES will eventually be hailed the de facto standard for encrypting data in the private sector.
- 12. It can operate as a positivefilter, allowingto pass only packets thatmeet specific criteria,or as a negativefilter, rejectingany packet that meetscertain criteria. Type of firewall: PacketFilter Stateful PacketInspection Application-LevelGateway
- 13. 13
- 14. Prevents cyber attack Levels of access Protect data Confidentiality Authentication Data Integrity Non-repudiation Costly set up Time consuming Requires skilled staff Careless admin Difficult to access even for a legitimate user High availability Selective access control
- 15. The explosive growth in the Internet Network and data security have become an inevitable concern whose internal private network is connected to the Internet. The security for the data has become highly important. User’s data privacy is a central question over cloud. With more mathematical tools, cryptographic schemes are getting more versatile and often involve multiple keys for a single application
- 16. Network Security is the most vital component in information security it is responsible for securing all information passed through networked computers adopted by the administrator to protect the network accessible resources from unauthorized access Cryptographic techniques to increase the security of network provide a high degree of protection in digital communications against intruder attacks
- 17. 1 - William Stallings Principles And Practices Book 2 - Lawrie Brown 3 - Dr. Himanshu Gupta ,Senior Faculty Member, Amity University 4 - Xiang-yang Li