One-time pad
A one-time pad is a symmetric encryption technique that combines plaintext with a truly random, equally long secret key that is never reused.
Hacking Cryptography
A one-time pad is an encryption technique that combines plaintext with a truly random key of equal length that is never reused.
- How it is used
- Frames XOR encryption as a perfectly secure construction and contrasts it with practical stream-cipher designs.
- How deep it goes
- Defines the construction, derives XOR attacks, and explains key transport limits without detailing a complete production implementation.
- Examples
- Uses “HELLO WORLD,” guessed greetings, XOR equations, and WEP compromise to demonstrate construction and failure.
- What you can do after
- Build it from scratch with random equal-length keys, apply XOR correctly, and diagnose known-plaintext or key-reuse exposure.
Classic Computer Science Problems in Swift: Essential techniques for practicing programmers
A symmetric encryption technique that combines plaintext with an equally long, secret, random pad so that the plaintext cannot be recovered without both resulting components.
- How it is used
- Uses byte-wise encryption to demonstrate a small, reusable programming building block.
- How deep it goes
- Explains pad criteria, UTF-8 byte handling, XOR, and Swift encryption and decryption, but stops short of formal security proofs.
- Examples
- Demonstrates encrypting a UTF-8 String in Swift and proposes encrypting and decrypting images.
- What you can do after
- Build it from scratch with Swift byte arrays, random pads, XOR encryption, and UTF-8 decryption.
Related concepts
- logical XORuses · Logical XOR is a binary operation that produces true when exactly one operand is true and false when both operands have the same truth value.
- encryptionkind of · Encryption is the cryptographic transformation of readable data into ciphertext to conceal its contents, reversible through decryption with appropriate information.
- digital imageuses · A digital image is visual content encoded as data, typically as a two-dimensional arrangement of pixels or equivalent visual elements.
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