E-mail and Encryption
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An old presentation describing one possible implementation of public key or asymmetric cryptography to secure e-mail traffic across public networks.
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Symmetric key encryption requires that each computer have a secret key that is used to encrypt data before sending it over a network. The same key is required by both computers to decrypt the encrypted information. Symmetric key encryption works like a secret code that both computers must know to encode and decode messages.
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2) Currently, most email services like Gmail can be accessed by system administrators and is sent in clear text, similar to sending a postcard through the mail system.
3) With end-to-end encryption, messages are encrypted like placing the message in a locked safe that only the intended recipient can open, providing privacy and security from threats of surveillance, hacking and other attacks.
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無題 1
This document discusses different types of encryption methods. It explains symmetric key encryption where both parties share the same key. It also describes public key encryption where each user has a public and private key. Finally, it discusses hashing algorithms which create unique codes from data but cannot be used to derive the original data.
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Today, more than ever, computer networks are utilized for sharing services and resources. Information travelling across a shared IP-based network, such as the Internet, could be exposed to many devious acts such as eavesdropping, forgery and manipulation. Fortunately, there are several mechanisms that can protect any information that needs to be sent over a network. This paper introduces security threats to today’s IP-based networks and explains available security mechanisms to effectively prevent such threats from happening.
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1) End-to-end encryption protects communications by encrypting messages in a way that only the sender and recipient can access, not intermediate servers or other third parties.
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This document discusses different types of encryption methods. It explains symmetric key encryption where both parties share the same key. It also describes public key encryption where each user has a public and private key. Finally, it discusses hashing algorithms which create unique codes from data but cannot be used to derive the original data.
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Encryption is the process of encoding information in such a way that only the intended recipient can read it. There are two main types: symmetric key encryption where both sides share the same key, and public key encryption where each side has a public and private key. Popular implementations of public key encryption include SSL/TLS which is used to securely transmit information on the web by encrypting data with a randomly generated symmetric key that is itself encrypted with the recipient's public key.
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towards the end of
Key distribution code.ppt
This document discusses network security and cryptography. It defines four requirements for secure transactions: confidentiality, integrity, authentication, and non-repudiation. It also defines cryptography as the science of encrypting messages to make them secure and immune to attacks. The two main categories of cryptography are symmetric-key and asymmetric-key cryptography. Symmetric-key cryptography uses the same key to encrypt and decrypt, while asymmetric-key cryptography uses public and private key pairs. Digital signatures, public key infrastructure, certificates, and cryptanalysis are also discussed.
N5 security precautions
Encryption is the process of encoding data to protect it. There are two main types: symmetric encryption which uses the same key for encoding and decoding but requires secure key sharing, and asymmetric encryption which uses a public/private key pair allowing secure communication without pre-shared keys. Security protocols like HTTPS and firewalls are also used to protect data transmission and access to private networks.
ISDD Security Precautions
Anti-virus software scans files to identify viruses by matching signatures of previously discovered viruses. It offers real-time protection and scheduled scans, and can delete or quarantine infected files. Passwords are commonly used with usernames to authenticate users, and should be at least 8 characters long without including personal details. Biometrics authenticate users using unique biological traits like fingerprints, iris patterns, or facial recognition. Encryption converts data into an unreadable format, while decryption reverses the process, and different encryption methods include symmetric, asymmetric, and digital signatures.
Discussion Question Contrast file encryption and volume encryptio.docx
Discussion Question: Contrast file encryption and volume encryption
· The discussion assignment requires an Original Posting (main post) from you of 2-3 paragraphs answering the module's question.
· In addition to your main post, you must post
three responses to other posts made by your classmates. These can be replies to other main posts or responding to student replies on your thread.
PLEASE RESPOND TO THE PEER POSTS BELOW
PEER 1
Ransomware works via finding its way onto a host computer, it's a kind of malware so it's like when your computer gets sick and slows it down but instead it locks out all your stuff. Usually what they ask for in return for control of your files is money, but sometimes they will ask for other important things. The FBI doesn't condone giving the attackers what they want because it's more than likely that they'll just take the money and keep your stuff locked, they'll possibly even ask for more. That's why they stress how important it is that if this happens to you then you should go to them for help. If your in a company then you ask your IT department.
The software goes through this encryption phase where it starts encrypting all the files on your computer until it's all locked and you can tell if something is encrypted usually because the file will have an extension added onto it. Such as .aaa , .micro , .encrypted , .ttt , .xyz , .zzz , .locky , .crypt , .cryptolocker , .vault , or .petya. These extensions are an indication that a file has been partially or fully encrypted. What's recommended is that as soon as you find out that your files are being locked, you disconnect from all wireless connections and other computing devices, because this virus can and will spread to cause even more havoc. It can spread across your network and ruin other computers on said network.
Ransomware is normally delivered by drive-by downloads or email phishing. Drive-by downloads are a fancy way of saying a download that you pick up while browsing a site and it runs in the background. Email phishing is one of the reasons you don't click on links from emails from anyone, even from trusted sources. If you know who the email is coming from your best bet is to get with them personally to make sure that it's a valid email and that it's not an attacker. If a ransom is paid though, the attack may give you an encryption key to unlock your files, if your lucky enough. Why take a chance though, you should always take the smart path and make sure that you contact the proper authorities if you come across anything like this in your time. Also make sure to back up your computer files, it may sound obvious enough to want to put it off and procrastinate this, but the longer you wait the more at risk you are.
PEER 2
This week, I have decided to write my discussion post about ransomware and explain how it works. I've always found it one of the more interesting topics in cybersecurity. The idea behind ransomware is quite si.
PresentationonCRYPTOGRAPHYppt.ppt - Read-Only - Compatibility Mode.ppt
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.
Security pre
This document discusses security precautions and encryption. It begins by describing encryption as encoding data into another form using a key so that intercepted data is meaningless without decrypting. There are two main encryption methods: symmetric key using the same secret key for encryption and decryption, and asymmetric key using a public/private key pair. Digital certificates and signatures are also discussed as a way to prove digital identity and verify message authenticity. UK computer crime law, the Computer Misuse Act of 1998, is summarized as prohibiting unauthorized computer access, access with criminal intent, and unauthorized/reckless computer impairment.
What is Encryption
Encryption transforms plain text into cipher text using encryption algorithms and keys to provide confidentiality, integrity, and authenticity of messages. Modern encryption uses both symmetric encryption with private keys and asymmetric encryption with public/private key pairs. Transport Layer Security (TLS) and Secure Sockets Layer (SSL) provide encrypted communication over the internet using technologies like digital certificates, the Diffie-Hellman key exchange, and algorithms like RSA and AES.
Network security notes
The document provides an introduction to cryptography. It discusses how Sheela and Tom used public-key cryptography to securely communicate. Tom encrypted a message with Sheela's public key. Sheela then decrypted it with her private key. Tom also sent a digital signature by encrypting a message digest with his private key and encrypting the original message with Sheela's public key. Sheela was able to verify the integrity and authenticity of the message by decrypting the digest with Tom's public key and comparing it to the digest she calculated from the original message. The document goes on to provide more details about symmetric and public key cryptography.
Internet Security
How internet can be secured from hackers, attackers, viruses, spammers, etc and measures to make our network secure.
Week12
Encryption systems are important for protecting sensitive information that is transmitted online, such as credit card numbers, social security numbers, private messages, and company secrets. The document introduces symmetric-key encryption, where both parties have the same secret key, and public-key encryption, which uses a public and private key pair to securely communicate. It describes how secure sockets layer (SSL) is used to encrypt web traffic and ensure sensitive information is protected when browsing or conducting financial transactions online. Hashing algorithms are also introduced as a way to securely generate keys for public-key encryption systems.
CRYPTOGRAPHY-PAYAL CHOPRA.ppt
This document provides an overview of cryptography. Cryptography is the practice of hiding information to ensure confidentiality, integrity, and authentication. There are two main types: secret key cryptography which uses a single key for encryption and decryption, and public key cryptography which uses separate public and private keys. Popular cryptographic algorithms include RSA and hash functions. Cryptography aims to provide security against common attacks such as ciphertext-only attacks.
Crypt
The document discusses cryptography concepts such as public key cryptography, digital signatures, and secure communication protocols. Public key cryptography uses key pairs to encrypt and decrypt messages, allowing private communication over insecure channels. Digital signatures authenticate messages by encrypting a cryptographic hash of the message with the sender's private key. Protocols like SSL and TLS provide secure channels by adding an encryption layer below the application layer.
How encryption works
Encryption encodes information in a way that only authorized parties can access it. There are two main types: symmetric-key encryption which uses the same secret key between two parties, and public-key encryption which uses a public and private key pair. Popular implementations of public-key encryption include PGP for encrypting files and SSL/TLS for secure web browsing and transactions.
Lesson 04 - Symmetric and Asymmetric Key Encryptions (1).pptx
1. Symmetric key cryptography uses a single secret key for both encryption and decryption, while asymmetric key cryptography uses two different but mathematically related keys, a public key and a private key.
2. In asymmetric encryption, the public key is used to encrypt messages and its companion private key is used to decrypt messages. Only the recipient who possesses the private key can decrypt messages encrypted with their public key.
3. The essential steps of asymmetric encryption are that each user generates a public-private key pair, places their public key in a register for others, and encrypts messages sent to recipients with their public key which can only be decrypted with the corresponding private key.
Similar to E-mail and Encryption (20)
Discussion Question Contrast file encryption and volume encryptio.docx
Discussion Question Contrast file encryption and volume encryptio.docx
PresentationonCRYPTOGRAPHYppt.ppt - Read-Only - Compatibility Mode.ppt
PresentationonCRYPTOGRAPHYppt.ppt - Read-Only - Compatibility Mode.ppt
Lesson 04 - Symmetric and Asymmetric Key Encryptions (1).pptx
Lesson 04 - Symmetric and Asymmetric Key Encryptions (1).pptx
E-mail and Encryption
- 1. E-mail and Encryption Ensuring secure communications in a distributed corporate environment.