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N5 security precautions

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N5 security precautions: Encryption and Firewalls

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N5 security precautions

  1. 1. Encryption Encryption is the conversion of data into a form that cannot be easily understood by unauthorised people Decryption is the inverse of encryption - reversing the steps of encryption in order to get the original message
  2. 2. Encryption Encryption allows us to protect data an message from anyone we do not want to see it. The encrypted data is known as cyphertext
  3. 3. Symmetric Encryption  Same key is used to encrypt and decrypt  Sender and receiver both know the key
  4. 4. Symmetric Encryption Advantages Faster and easier to implement that asymmetric encryption Disadvantages Sender and receiver need to know the key, but how do they share that securely? If they have a secure way of sending the key, why would they need to use encryption…?
  5. 5. Asymmetric Encryption  A pair of keys is used to encrypt the data  Private key and public key  Anyone can encrypt a message using a public key  Only the holder of the private key can decrypt the message  Asymmetric encryption is also known as public-key encryption
  6. 6. Asymmetric Encryption Example 1.Aaron(the recipient) generates a pair of keys, one public and one private 2.He sends the public key to Alison (the sender) 3.Alison encrypts the message using the public key and sends it to Aaron 4.Aaron decrypts the message using the private key
  7. 7. Asymmetric Encryption Advantages No need for private key exchange Increased security – only person with private key can decrypt Can be used for Digital Signatures Disadvantages Slow – takes time to encrypt and decrypt Could be cracked using brute force – try all possible keys (although RSA Security claim that using a 2048 bit key would not be crackable until around 2030).
  8. 8. Security Protocols Security protocols ensure data is protected when sent across a network Hyper Text Transfer Protocol Secure The secure version of HTTP Data sent between browser and the website is encrypted Used with banks, shops, webmail etc. to encrypt credit card and other transaction and personal details
  9. 9. Firewall  Prevents unauthorised access to a private network  Can be hardware and/or software  All messages entering or leaving network pass through firewall which checks to see if the meet allowed criteria
  10. 10. Firewall

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