What is your understanding of the difference between an unconditionally secure cipher and a computationally secure cipher?

  The unconditionally secured is basically define as, the cipher content produced by the plan that doesn't contain enough data to decide the comparing plain message ,regardless of what number of figure content is accessible.

It is basically used to determine the uniquely plain content without knowing the actual availability of the cipher.

The computationally secure cipher is the encryption scheme which is basically required the time for breaking the cipher which exceeds the helpfulness lifetime of that data.  The expense of breaking the figure surpasses the estimation of scrambled data