Re: Strongest encryption algorithm

giorgio.tani wrote:
1) In you opinion what is the strongest encyption algorythm avaiable
today.
OTP is theoretically secure (probability of breaking an OTP collapse
into the probability of guessing the message) so I think it may be
called the strongest, however is less practical to use than modern
ciphers and doesn't give any protection against message corruption, so
is suitable only to meet privacy and not autenticity.

Please explain what symmetric cipher in common use today also gives authenticity without any extra extra work.
.