Two-square cipher | Encryption, Symmetric-Key Algorithm, Playfair Cipher, Frequency Analysis, Four-Square Cipher, Cryptanalysis, Outline of Cryptography, Substitution Cipher

Lambert M. Surhone (u. a.)

ISBN 10: 6130354681 / ISBN 13: 9786130354688

Published by OmniScriptum, 2026

About this Item

Two-square cipher | Encryption, Symmetric-Key Algorithm, Playfair Cipher, Frequency Analysis, Four-Square Cipher, Cryptanalysis, Outline of Cryptography, Substitution Cipher | Lambert M. Surhone (u. a.) | Taschenbuch | Englisch | 2026 | OmniScriptum | EAN 9786130354688 | Verantwortliche Person für die EU: preigu GmbH & Co. KG, Lengericher Landstr. 19, 49078 Osnabrück, mail[at]preigu[dot]de | Anbieter: preigu Print on Demand.

Seller Inventory # 101336840

Bibliographic Details

• Title: Two-square cipher | Encryption, Symmetric-Key Algorithm, Playfair Cipher, Frequency Analysis, Four-Square Cipher, Cryptanalysis, Outline of Cryptography, Substitution Cipher
• Publisher: OmniScriptum
• Publication Date: 2026
• Language: English
• ISBN 10: 6130354681
• ISBN 13: 9786130354688
• Binding: Taschenbuch
• Condition: Neu
• Dimensions: 220W x 150H x 4D millimeters 220 millimeters width by 150 millimeters height by 4 millimeters depth
• Weight: 113 grams
• Seller catalogs:
  • Bücher

About this title

Synopsis

Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Two-square cipher is a manual symmetric encryption technique. It was developed to ease the cumbersome nature of the large encryption/decryption matrix used in the four-square cipher while still being slightly stronger than the Playfair cipher.The technique encrypts pairs of letters (digraphs), and thus falls into a category of ciphers known as polygraphic substitution ciphers. This adds significant strength to the encryption when compared with monographic substitution ciphers which operate on single characters. The use of digraphs makes the two-square technique less susceptible to frequency analysis attacks, as the analysis must be done on 676 possible digraphs rather than just 26 for monographic substitution. The frequency analysis of digraphs is possible, but considerably more difficult - and it generally requires a much larger ciphertext in order to be useful.