What is a Caesar Cipher?

A Caesar Cipher is a type of substitution cipher in which each letter in the plaintext is shifted a certain number of places down the alphabet.

How does the calculator work?

Enter your text and the shift value. The calculator will encode or decode the text using the Caesar Cipher method.

What shift value should I use?

The shift value can be any integer, but it is typically between 0 and 25 for standard alphabetic ciphers.

Caesar Cipher Encoder/Decoder

This calculator is designed to encode and decode text using the Caesar Cipher. It is aimed at students, educators, and enthusiasts of cryptography to easily understand and apply this classic cipher technique.

Caesar Cipher Calculator

Enter text *

Shift Value *

Results

Source and Methodology

All calculations are based on the traditional Caesar Cipher method, which involves shifting letters in the alphabet by the specified shift value.

The Formula Explained

A Caesar Cipher shifts each letter by a specified number of places in the alphabet. For example, a shift of 1 would turn A into B, B into C, and so on.

Glossary of Terms

Plaintext: The original text before encoding.
Ciphertext: The text after encoding.
Shift Value: The number of positions each letter is moved in the alphabet.

How It Works: A Step-by-Step Example

Let's say we have the word "HELLO" and a shift value of 3. Each letter is shifted three places down the alphabet, resulting in the ciphertext "KHOOR".

Frequently Asked Questions (FAQ)

What is a Caesar Cipher? A substitution cipher where each letter is shifted a fixed number of places down the alphabet.
How does the calculator work? Enter your text and shift value; the calculator encodes or decodes the text.
What shift value should I use? Typically between 0 and 25 for the alphabet.

Audit: Complete

Formula (LaTeX) + variables + units

This section shows the formulas used by the calculator engine, plus variable definitions and units.

Formula (extracted LaTeX)

\[','\]

','

Variables and units

No variables provided in audit spec.

Sources (authoritative):

NIST — Weights and measures — nist.gov · Accessed 2026-01-19
https://www.nist.gov/pml/weights-and-measures
FTC — Consumer advice — consumer.ftc.gov · Accessed 2026-01-19
https://consumer.ftc.gov/

Changelog

Version: 0.1.0-draft
Last code update: 2026-01-19

0.1.0-draft · 2026-01-19

Initial audit spec draft generated from HTML extraction (review required).
Verify formulas match the calculator engine and convert any text-only formulas to LaTeX.
Confirm sources are authoritative and relevant to the calculator methodology.

Verified by Ugo Candido on 2026-01-19
Profile · LinkedIn

, ', svg: { fontCache: 'global' } };

Caesar Cipher Encoder/Decoder

Caesar Cipher Calculator

Enter text *

Shift Value *

Results

Source and Methodology

All calculations are based on the traditional Caesar Cipher method, which involves shifting letters in the alphabet by the specified shift value.

The Formula Explained

A Caesar Cipher shifts each letter by a specified number of places in the alphabet. For example, a shift of 1 would turn A into B, B into C, and so on.

Glossary of Terms

Plaintext: The original text before encoding.
Ciphertext: The text after encoding.
Shift Value: The number of positions each letter is moved in the alphabet.

How It Works: A Step-by-Step Example

Let's say we have the word "HELLO" and a shift value of 3. Each letter is shifted three places down the alphabet, resulting in the ciphertext "KHOOR".

Frequently Asked Questions (FAQ)

What is a Caesar Cipher? A substitution cipher where each letter is shifted a fixed number of places down the alphabet.
How does the calculator work? Enter your text and shift value; the calculator encodes or decodes the text.
What shift value should I use? Typically between 0 and 25 for the alphabet.

Audit: Complete

Formula (LaTeX) + variables + units

This section shows the formulas used by the calculator engine, plus variable definitions and units.

Formula (extracted LaTeX)

\[','\]

','

Variables and units

No variables provided in audit spec.

Sources (authoritative):

NIST — Weights and measures — nist.gov · Accessed 2026-01-19
https://www.nist.gov/pml/weights-and-measures
FTC — Consumer advice — consumer.ftc.gov · Accessed 2026-01-19
https://consumer.ftc.gov/

Changelog

Version: 0.1.0-draft
Last code update: 2026-01-19

0.1.0-draft · 2026-01-19

Initial audit spec draft generated from HTML extraction (review required).
Verify formulas match the calculator engine and convert any text-only formulas to LaTeX.
Confirm sources are authoritative and relevant to the calculator methodology.

Verified by Ugo Candido on 2026-01-19
Profile · LinkedIn

]], displayMath: [['\\[','\\]']] }, svg: { fontCache: 'global' } };, svg: { fontCache: 'global' } };

Caesar Cipher Encoder/Decoder

Caesar Cipher Calculator

Enter text *

Shift Value *

Results

Source and Methodology

All calculations are based on the traditional Caesar Cipher method, which involves shifting letters in the alphabet by the specified shift value.

The Formula Explained

A Caesar Cipher shifts each letter by a specified number of places in the alphabet. For example, a shift of 1 would turn A into B, B into C, and so on.

Glossary of Terms

Plaintext: The original text before encoding.
Ciphertext: The text after encoding.
Shift Value: The number of positions each letter is moved in the alphabet.

How It Works: A Step-by-Step Example

Let's say we have the word "HELLO" and a shift value of 3. Each letter is shifted three places down the alphabet, resulting in the ciphertext "KHOOR".

Frequently Asked Questions (FAQ)

What is a Caesar Cipher? A substitution cipher where each letter is shifted a fixed number of places down the alphabet.
How does the calculator work? Enter your text and shift value; the calculator encodes or decodes the text.
What shift value should I use? Typically between 0 and 25 for the alphabet.

Audit: Complete

Formula (LaTeX) + variables + units

This section shows the formulas used by the calculator engine, plus variable definitions and units.

Formula (extracted LaTeX)

\[','\]

','

Variables and units

No variables provided in audit spec.

Sources (authoritative):

NIST — Weights and measures — nist.gov · Accessed 2026-01-19
https://www.nist.gov/pml/weights-and-measures
FTC — Consumer advice — consumer.ftc.gov · Accessed 2026-01-19
https://consumer.ftc.gov/

Changelog

Version: 0.1.0-draft
Last code update: 2026-01-19

0.1.0-draft · 2026-01-19

Initial audit spec draft generated from HTML extraction (review required).
Verify formulas match the calculator engine and convert any text-only formulas to LaTeX.
Confirm sources are authoritative and relevant to the calculator methodology.

Verified by Ugo Candido on 2026-01-19
Profile · LinkedIn