OTP
Retinal scans are considered to be the most secure forms of biometric security.
Retinal scanning
It is true.
Israel's most secured airline is El Al, which is also considered as the world's most secure airline.
The "W" in steel I-beam designations refers to wide-flanged beams. Most wide-flanged beams are symmetric about both the vertical and horizontal axes.
more secure and most secure
DES
Symmetric key algorithms
Taj Mahal
Symmetric key
cnidarians
Most annelids are essentially tubes so they are radially symmetric.