one failing of an encryption system occurs if we never let the encrypted value o
ID: 3854912 • Letter: O
Question
one failing of an encryption system occurs if we never let the encrypted value of a letter be the same as the original, especially if a letter always encodes to the same value. Let’s see how we can exploit these weaknesses. Let’s assume that we know that the NOTHING is in an intercepted message. If we received the following transmission, what are the encrypted values (give the mappings to their encrypted values) of the letters N, O, T, H, I, G? To test your detective skills, what is the original message (give the exact message)?
Hint: It’s a simple cipher ... look for a unique pattern in NOTHING and because you are told that a character never encodes to itself and that a character always encodes to the same value, you can exploitthis to find out where NOTHING will appear in the message.
Explanation / Answer
The word NOTHING has a repeated letter N and there exists 4 letters in between two occurences of N.
Therefore in the received message, there must be 4 letters in between the 2 repeating letters.
Given Transmission word is - QSRI13JSVRSXLMRK
As seen here from the last 7 letters, there are 4 letters between two
occurences of R, so the mapping will be as follows.
R = N
S = O
X = T
L = H
M = I
K = G
If we take the above mapping and apply to rest of the word, then we will get the
decrypted text as - "ONO NOTHING"
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