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The Playfair is susceptible to digraph frequency analysis. Separate the plaintext into digraphs and do a frequency count. Once you've found that, compare the digraph frequency of the ciphertext to the digraph frequency of English and see how it might fit in to the Playfair grid. An intimate understanding of how letters in the grid relate to each other and implications of how the grid is affected by correspondences between the ciphertext and plaintext is critical. I'll try to post a help video on YouTube in the near future.

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Q: How do you break the playfair cipher?
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Related questions

What substitution system results when you use a 25 x 1 playfair matrix?

Caesar Cipher

How many possible keys does the Playfair cipher have?

25! = 2^84

Can a letter be repeated in the cipher text in a playfair cipher?

You mean your plaintext message the yes you can but you have to separate it with an x when you put letters in pairs, but in a key no.

What are the advantages and disadvantages of play fair cipher?

The Playfair Cipher is useful because it requires no special equipment to use. However, it was invented in 1854 and is antiquated and rarely used in the present.

What is the birth name of Giles Playfair?

Giles Playfair's birth name is Giles William Playfair.

When was Edward Playfair born?

Edward Playfair was born in 1909.

When did Edward Playfair die?

Edward Playfair died in 1999.

When did John Playfair die?

John Playfair died in 1819.

When was John Playfair born?

John Playfair was born in 1748.

When was Jocelyn Playfair born?

Jocelyn Playfair was born in 1904.

When did Jocelyn Playfair die?

Jocelyn Playfair died in 1996.

When was William Playfair born?

William Playfair was born in 1759.