Vigenere Cipher Encryption

Plain Text:

The quick brown fox jumps over the lazy dog and the quick brown fox jumps again over the fence while the lazy dog sleeps under the tree

Key (repeated):

SEC RETSE CRETS ECR ETSEC RETS ECR ETSE CRE TSE CRE TSECR ETSEC RET SECRE TSECR ETSE CRE TSECR ETSEC RET SECR ETS ECRETS ECRET SEC RETS

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Cipher Text:

Frequency Analysis

Most Frequent (Cipher)
-
-
Index of Coincidence
0.0000
Calculating...

Instructions

The Vigenere cipher uses a keyword to create multiple Caesar shifts. Each letter of the key determines the shift for the corresponding letter in the plaintext.

Watch the Vigenere table highlight as each letter is encrypted. The row is determined by the key letter, and the column by the plaintext letter.

Why It's Stronger

Unlike Caesar cipher, Vigenere uses multiple shifts determined by a keyword. This makes simple frequency analysis ineffective, as the same letter can be encrypted differently each time!

Sorry, this demo is best viewed on a larger screen.

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