The method is used as an aid to breaking classical ciphers.

Other types of classical ciphers are sometimes used to create cryptograms.

Frequency analysis is the basic tool for breaking most classical ciphers.

With modern computing power, classical ciphers are unlikely to provide any real protection for confidential data.

Classical ciphers are commonly quite easy to break.

Classical ciphers do not satisfy these much stronger criteria and hence are no longer of interest for serious applications.

Such classical ciphers still enjoy popularity today, though mostly as puzzles (see cryptogram).

Historical pen and paper ciphers used in the past are sometimes known as classical ciphers.

Some classical ciphers (e.g. the Caesar cipher) have a small key space.

Like most classical ciphers, the Playfair cipher can be easily cracked if there is enough text.

Classical ciphers are typically vulnerable to known-plaintext attack.

Hundreds of ciphers have been created, but the ones most commonly used in cryptoquotes are known as classical ciphers.

Almost all classical ciphers.

Ciphertexts produced by a classical cipher (and some modern ciphers) always reveal statistical information about the plaintext, which can often be used to break them.

Modern ciphers are more secure than classical ciphers and are designed to withstand a wide range of attacks.

In cryptography, a classical cipher is a type of cipher that was used historically but now has fallen, for the most part, into disuse.

Sometimes grouped with classical ciphers are more advanced mechanical or electro-mechanical cipher machines, such as the Enigma machine.

Classical ciphers are often divided into transposition ciphers and substitution ciphers.

Many of the classical ciphers can be broken even if the attacker only knows sufficient ciphertext and hence they are susceptible to a ciphertext-only attack.

Many of the classical ciphers can be cracked using brute force or by analyzing only ciphertext with the exception of the one-time pad.

In general, classical ciphers operate on an alphabet of letters (such as "A-Z"), and are implemented by hand or with simple mechanical devices.

A reasonably-designed code is generally more difficult to crack than a classical cipher, but of course suffers from the difficulty of preparing, distributing, and protecting codebook.

While most classical ciphers are vulnerable to this form of attack, most modern ciphers are designed to prevent this type of attack above all others.

The primary use of padding with classical ciphers is to prevent the cryptanalyst from using that predictability to find cribs that aid in breaking the encryption.

Many classical ciphers were used by well-respected people, such as Julius Caesar and Napoleon, who created their own ciphers which were then popularly used.