Coding and De-coding
What is Coding and De-coding?
The process of encrypting a word, number, or message into a secret code based on a specific rule or pattern.
Key formula / rule: Letter Position (Forward)
Key points
- To identify various types of coding patterns (e.g., letter shift, number assignment, symbol substitution).
- To apply identified patterns accurately to decode given messages or words.
- To solve coding-decoding problems efficiently under timed conditions.
- To develop quick analytical skills for pattern recognition.
Common exam trap
Misidentifying the exact pattern or rule.
Definitions
- Term
Coding
- Meaning
The process of encrypting a word, number, or message into a secret code based on a specific rule or pattern.
- Term
De-coding
- Meaning
The process of decrypting a coded message back into its original, understandable form by identifying and applying the underlying rule.
Learning objectives
To identify various types of coding patterns (e.g., letter shift, number assignment, symbol substitution).
To apply identified patterns accurately to decode given messages or words.
To solve coding-decoding problems efficiently under timed conditions.
To develop quick analytical skills for pattern recognition.
Formulae
- Name
Letter Position (Forward)
- Note
Assigns a numerical value to each letter based on its order in the alphabet.
- Expression
A=1, B=2, ..., Z=26
- Name
Letter Position (Reverse)
- Note
Assigns a numerical value to each letter based on its reverse order in the alphabet.
- Expression
Z=1, Y=2, ..., A=26
- Name
Opposite Letter Sum
- Note
The sum of the forward positions of any letter and its opposite letter is always 27.
- Expression
Position(Letter) + Position(Opposite Letter) = 27
Prerequisites
Basic knowledge of the English alphabet and its sequence.
Ability to perform simple arithmetic operations (addition, subtraction, etc.).
Fundamental logical reasoning and pattern recognition skills.
Common mistakes
Misidentifying the exact pattern or rule.
Making calculation errors with letter positions or numerical values.
Not checking the consistency of the pattern across all elements of the given coded word/message.
Spending too much time on a single question, leading to time management issues.
Keywords
Coding
Decoding
Alphabet Series
Letter Shifting
Number Coding
Symbol Coding
Pattern Recognition
Logical Reasoning
Encryption
Decryption
Practice preview
If 'red' is called 'blue', 'blue' is called 'green', 'green' is called 'yellow', what is the colour of clear sky?…
medium
If 'CAT' is coded as 'DBU', how is 'DOG' coded?…
easy
If 'APPLE' is coded as 'ZOOKD', how is 'MANGO' coded?…
easy