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Hello William,
๐ Nice work! You have proven that you are a qualified "Agent with PHP and Encryption Experience". You have gained valuable experience both in building and in using encryption tools.
Key points to review and remember:
- Symmetric key algorithms
- "password encryption"
- fast, can handle large amounts of data
- the key or password must be shared secretly somehow
- Asymmetric key algorithms
- "public-private keys"
- slow, can only handle small amounts of data
- public key can be shared openly
- Checksum/Hash
- Works because same function inputs = same output
- Used to verify data integrity
- Digital Signature
- Checksum with a public/private key added
- Used to verify data integrity + authenticity
If you would like to learn more about code and cryptography, "The Code Book: The Science of Secrecy from Ancient Egypt to Quantum Cryptography" by Simon Singh is an excellent book on both the history and techniques.
If you have any particular questions about the assignment or the feedback, email us at [email protected].
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