A session key is a temporary encryption key
used between two principals.
A master key is a long-lasting key that is
used between a key distribution centre and a
principal for the purpose of encoding the
transmission of session keys.
Typically, the master keys are distributed by
noncryptographic means.
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The backspace key deletes to the left of the cursor, and the delete key deletes to the right of the cursor.
WEP64 uses a 64-bit encryption key, and WEP128 uses a 128-bit key.
print screen key takes almost a picture of what is currenly on your compuer screen
A key is the name of a variable in an array ($array["key"]) and the index is the position it's at ($array = ["key" => 0], the index would be 0). Keys and indices are the same if the array is not associative though ($array = [true], the key holding the value true is named 0 and is at index 0).
The key of G-sharp minor has 5 sharps (it's the relative to B major). G-flat minor is a key that only exists in theory, because that key signature would contain 9 flats. The limit on flats or sharps in a key is 7.