search
Log In
3 votes
3.6k views

A message "COMPUTERNETWORK" encrypted (ignore quotes) using columnar transposition cipher with a key "LAYER". The encrypted message is

  1. CTTOEWMROPNRUEK
  2. MROUEKCTTPNROEW
  3. OEWPNRCTTUEKMRO
  4. UEKPNRMROOEQCTT
in Computer Networks
recategorized by
3.6k views
0
Algorithm for simple columnar transposition technique with multiple round

1. write the plain text msg row by row in a rectangle of a predefined set

2. Read the msg column by column. However it nedd not be any order of column 1, 2,3 etc. it can be any random order such as 2,3,1 etc

3. The msg thus obtained is cipher text msg of round 1

4. Repeat step 1 to 3 as manytime as desired.

1 Answer

9 votes
 
Best answer
this one is simple and intersting  just make the colum arrangement as below

3    1   5    2   4

L    A   Y   E   R    (assign number from 1 onwards as per aplhabetical order e.g A=1 E=2.....) IGNORE ""

C   O   M   P   U

T    E   R   N   E

T    W  O   R   K

S

NOW write all letters of column 1 then 2  3,4,5  and ans will be OEWPNRCTTSUEKMRO

selected by
0
Should we expect these type of qiestions in Gate ?
1
This  belongs to cryptography and already came in ugc net exam so why not
0
Thanks :)
Answer:

Related questions

2 votes
2 answers
1
1.3k views
Which are two modes of IP security? Transport and certificate Transport and tunnel Certificate and tunnel Preshared and transport
asked Aug 1, 2016 in Computer Networks jothee 1.3k views
3 votes
1 answer
2
1.9k views
In a binary Hamming Code the number of check digits is r then number of message digits is equal to $2^r-1$ $2^r-r-1$ $2^r-r+1$ $2^r+r-1$
asked Aug 2, 2016 in Computer Networks jothee 1.9k views
3 votes
2 answers
3
2.2k views
The minimum payload of a TCP segment is 65,535 65,515 65,495 65,475
asked Aug 1, 2016 in Computer Networks jothee 2.2k views
3 votes
1 answer
4
1.8k views
Suppose a digitazed voice channel is made by digitizing 8 kHz bandwidth analog voice signal. It is required to sample the signal at twice the highest frequency (two samples per hertz). What is the bit rate required, if it is assumed that each sample required 8 bits? 32 kbps 64 kbps 128 kbps 256 kbps
asked Aug 1, 2016 in Computer Networks jothee 1.8k views
...