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Difficulty: MediumCoding and Decoding

A deep sea research submarine logs environmental phenomena in an encrypted transmission system. In this protocol, the phenomenon "TRENCH" is recorded as "VTDPEJ", and "CORAL" is recorded as "ENTZN". Based on this cryptographic pattern, what will be the recorded code for the word "TIDES"?

Answer: VHFDU / vhfdu

Answer

VHFDU
The established coding pattern shifts consonants forward by 2 positions in the English alphabet and shifts vowels backward by 1 position. Applying this rule to 'TIDES', the consonants (T, D, S) become (V, F, U) and the vowels (I, E) become (H, D). Combining these letters in sequence yields 'VHFDU'.

Step-by-Step Solution

1
Analyze the letter shifts in the first example 'TRENCH' -> 'VTDPEJ'.
T(+2)=V, R(+2)=T, E(-1)=D, N(+2)=P, C(+2)=E, H(+2)=J. Consonants move forward by 2 positions, while the vowel 'E' moves backward by 1 position.
Identifying the initial transformation rule for different letter types.
2
Verify the identified pattern with the second example 'CORAL' -> 'ENTZN'.
C(+2)=E, O(-1)=N, R(+2)=T, A(-1)=Z, L(+2)=N. The pattern is confirmed: Consonants +2, Vowels -1.
Confirming the hypothesis to ensure the rule is universally applied in this cryptographic protocol.
3
Classify the letters of the target word 'TIDES' into vowels and consonants.
Consonants: T, D, S. Vowels: I, E.
Preparing to apply the appropriate shift rule to each letter.
4
Apply the verified shift rules (+2 for consonants, -1 for vowels) to 'TIDES'.
T(+2)=V, I(-1)=H, D(+2)=F, E(-1)=D, S(+2)=U. The final code is VHFDU.
Executing the final translation to obtain the required answer.

Key Concept

Coding and decoding using bifurcated shift rules for vowels and consonants
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Topics

Coding and Decoding

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