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What are two problems with the one-time pad?
The two problems are; 1. The One time pad needs to be truly random. Pseudo random generators are quick however they can be predicted. The second is practicability of being able to transmit the number of keys securely to the receiver. For every bit of plain text, there is also 1bit of key.
How would one describe pad printing?
Pad printing can be described as a process where two dimensional images are transferred on three dimensional objects. Pad printing is used on golf balls and keyboards.
What pseudo-random block stream is generated by 64-bit OFB with a weak DES key?
With (OFB) output feed back, a random 64-bit number, known as the IV is encrypted with the weak secret key to create the one-time pad. A weak DES secret key is one which is either all 1's, 0's or alternating ones and zeros. The plain text is XOred with as many bits of the generated one-time pad. If a weak key patterns will emerge in the ciphertext. - Eric Appelboom
What are some Everyday items that were used in the 1870's?
One item was a washing board that looked like a pad with lines in it
You have 28x20 square feet how many cubic yard concrete you do whants?
That depends on how deep you pour it.The number of cubic yards you need is(length of the pad in feet) x (width of the pad in feet) x (depth of the pad in inches)/324For your 28' x 20' pad, that's [ (1.728) x (depth in inches) ] cubic yards.
