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  1  definition  found 
 
  From  The  Free  On-line  Dictionary  of  Computing  (13  Mar  01)  [foldoc]: 
 
  checksum 
 
    A  computed  value  which  depends  on 
  the  contents  of  a  block  of  data  and  which  is  transmitted  or 
  stored  along  with  the  data  in  order  to  detect  corruption  of 
  the  data.  The  receiving  system  recomputes  the  checksum  based 
  upon  the  received  data  and  compares  this  value  with  the  one 
  sent  with  the  data.  If  the  two  values  are  the  same  the 
  receiver  has  some  confidence  that  the  data  was  received 
  correctly. 
 
  The  checksum  may  be  8  bits  (modulo  256  sum),  16,  32,  or  some 
  other  size.  It  is  computed  by  summing  the  bytes  or  words  of 
  the  data  block  ignoring  {overflow}.  The  checksum  may  be 
  negated  so  that  the  total  of  the  data  words  plus  the  checksum 
  is  zero. 
 
  {Internet}  {packets}  use  a  32-bit  checksum. 
 
  See  also  {digital  signature},  {cyclic  redundancy  check}. 
 
  (1996-03-01) 
 
 

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