Edexcel curriculum (2015)
PythonBinary/HexData representationCompression
EncryptionWhat is a computer?
Working computerHardwareOperating systemComputer processesThe CPUMemoryInput devicesOutput devicesData storageInside the CPUStored programF-D-E cycleCPU componentsNetworksLAN, WAN and PANNetwork topologiesNetwork addressingProtocolsError detectionThe internetThe world wide webHTML and CSSClient-server modelVPNsSQLImpactEthical issuesMicrocontrollersComp modelsEmerging trendsVirtual machinesModels and simsAlgorithms |
EncryptionEncoding vs Encryption
Encoding: convert into a coded form or a short hand form. E.g. WHU vs CHE means West Ham united vs Chelsea (not secure) Encryption: scramble data in such a way that only someone with the secret code or key can read it. (secure) The encryption process
A key is used to encrypt plain text into meaningless cipher text The same key is used to decrypt the data back into its original form. Only someone who knows the key can decrypt the cipher. If you don’t have the key you need to crack/hack the code. Useful links
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