Thomas jefferson
The Greeks
James Leeson
A cipher machine is a mechanical device for encoding and decoding messages.
unconditional security no matter how much computer power or time is available, the cipher cannot be broken since the ciphertext provides insufficient information to uniquely determine the corresponding plaintext computational security given limited computing resources (eg time needed for calculations is greater than age of universe), the cipher cannot be broken
code.
The Greeks
The inventor of the swivel chair was the third President of the United States, Thomas Jefferson. He also invented the cipher wheel, the moldboard plow and the spherical sundial.
- Dumbwaiter - Folding camp stool - Lazy Susan He also invented the Jefferson cipher wheel, macaroni and cheese, the hideaway bed, the Great Clock, and the pedometer.
James Leeson
- Dumbwaiter - Folding camp stool - Lazy Susan He also invented the Jefferson cipher wheel, macaroni and cheese, the hideaway bed, the Great Clock, and the pedometer.
Old man mcgucet
yes
The Playfair Cipher is useful because it requires no special equipment to use. However, it was invented in 1854 and is antiquated and rarely used in the present.
Thomas Jefferson was the 3rd president and had many, many inventions. His top 11 inventions were..1. dumbwaiters (for wine bottles)2. the great clock3. the hideaway bed4. mac & cheese5. the pedometer6. the plow moldboard of least resistance7. the polygraph8. the revolving book-stand9. an improved swivel chair10. the spherical sundial11. the wheel cipher
the mesopotamians invented the wheel
who invented the first steering wheel
The sumerians invented the water wheel.