By Helen F. Gaines
Comprises "166 cryptograms."
summary: comprises "166 cryptograms."
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Additional resources for Cryptanalysis ; a study of ciphers and their solution
PERIODIC CIPHERS WITH MIXED ALPHABETS XIX. POLYALPHABETICAL ENCIPHERMENT APPLIED BY GROUPS XX. VIGENÈRE WITH KEY-PROGRESSION XXI. POLYGRAM SUBSTITUTION— THE PLAYFAIR CIPHER XXII. HIGHLIGHTS OF FRACTIONAL SUBSTITUTION XXIII. INVESTIGATING THE UNKNOWN CIPHER APPENDIX ENGLISH FREQUENCY AND SEQUENCE DATA COMPARATIVE TABLE OF SINGLE-LETTER FREQUENCIES CHART SHOWING NORMAL CONTACT PERCENTAGES (BY F. R. CARTER) CHART SHOWING FREQUENCIES OF ENGLISH DIGRAMS (BY O. PHELPS MEAKER) SOME FOREIGN LANGUAGE DATA BIBLIOGRAPHY (BY W.
THE CONSONANT-LINE SHORT CUT A METHOD FOR ATTACKING DIFFICULT CASES (BY GEORGE C. LAMB) XI. SIMPLE SUBSTITUTION WITH COMPLEXITIES XII. MULTIPLE-ALPHABET CIPHERS— THE VIGENÈRE XIII. THE GRONSFELD, PORTA, AND BEAUFORT CIPHERS XIV. THE KASISKI METHOD FOR PERIODIC CIPHERS XV. MISCELLANEOUS PHASES OF VIGENÈRE DECRYPTMENT XVI. AUTO-ENCIPHERMENT XVII. SOME PERIODIC NUMBER-CIPHERS XVIII. PERIODIC CIPHERS WITH MIXED ALPHABETS XIX. POLYALPHABETICAL ENCIPHERMENT APPLIED BY GROUPS XX. VIGENÈRE WITH KEY-PROGRESSION XXI.
This figure shows also, in its two cryptograms (a) and (b), two fundamentally different plans for the taking off of transpositions. The unit here is 4, the first unit containing the letters A B C D, the next unit E F G H, and so on. In cryptogram (a), the letters of every unit are still standing together in a group, while in cryptogram (b), the letters of any one unit have been mixed with letters of other units. In this latter case, the two correspondents will have to agree upon a certain number of crosses per line; otherwise, they run the risk of having to decrypt each other’s cryptograms.
Cryptanalysis ; a study of ciphers and their solution by Helen F. Gaines