<Tr> <Th_colspan="2"> Cipher detail </Th> </Tr> <Tr> <Th> Key sizes </Th> <Td> 128, 192 or 256 bits </Td> </Tr> <Tr> <Th> Block sizes </Th> <Td> 128 bits </Td> </Tr> <Tr> <Th> Structure </Th> <Td> Substitution - permutation network </Td> </Tr>

The aes algorithm was the first public key encryption algorithm