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single-side error- a source x sends 0s and 1s with probabilities pi and 1-pi respectively to a receiver y the 1s are
one error only-consider a source x that has two symbols these are coded in binary as 00 and 11 respectively each x
braille- in braille each character consists of a pattern of raised dots there are six positions in a character each of
function suppose that the source x is mapped into the source y having values yjnbsp gxi for xinbspisin xa show that hy
binary erasure channel-consider a channel in which some bits are lost during transmission the receiver knows which bits
rectangular code-show that the parity bit in the lower-left-hand corner of the rectangular code is consistent in both
isbn correction find the missing digit in the isbn numbers belowa 0-385-49531-b 0-201-1794-2isbn codea show that the
syndrome parity bits derive the formulas for the parity bits x5 x6 x7 of the hamming 7 4 codehamming code error a
code shortening suppose a binary code of length n has m words and a minimum distance d-an n m d code the set can be
code lengthening a code can be lengthened by one bit by adjoining a parity bit if this is done what happens to d and to
linear code a certain linear code is defined by the parity matrixa find the corresponding code wordshint it may be
rate of ldpc a binary block code that translates k message bits into codewords of length n is said to have rate r kn
homophonic cipher- suppose that a language using an alphabet of j letters has the property that the i-th letter has a
running cipher-one method for increasing the security of vigenegravere-type encryption is to use a running text as key
how big what is the unicity point of a one-time pad chessboard unicity a transposition code is devised that permutes
secure condition-show that a necessary and sufficient condition for perfect security is hcm hc for every set of
hill cipher hill devised a cipher that extends both transposition and linear ciphers it has the formwhere a is an n
affine ciphers- let a be an integer between 1 and 26 and let x be the integer corresponding to one of the 26 letters of
vigenegravere and transpositionsuppose a vigenegravere cipher is constructed with a key that is three letters long the
beaufort cipher- let k k1 k2 kn be a keyword of length n and let p p1 p2 pn be a plaintext message of length n
transposition cipher-consider a transposition cipher that uses a five by five matrix and permutes the columns before
freedom express freeex affectionately known as the filibuster fly is a small commuter airline based in washington dc
maximal period shift register -show that if a linear shift register has maximal period then a sequence having that
activity crashingproblem statementfor the network above assume that an activitys daily expedite-cost in dollars per day
federal express tiger international acquisition11what has become one of americas great success stories began operations