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- https://math.libretexts.org/Courses/Las_Positas_College/Math_for_Liberal_Arts/06%3A_Cryptography/6.02%3A_Substitution_CiphersIn the case of a shift cipher, the method is “a shift cipher is used.” The encryption key is the specific amount of shift used. By choosing a random mapping, we could get a more secure cipher, with th...In the case of a shift cipher, the method is “a shift cipher is used.” The encryption key is the specific amount of shift used. By choosing a random mapping, we could get a more secure cipher, with the tradeoff that the encryption key is harder to describe; the key would now be the entire mapping, rather than just the shift amount. Because of the high frequency of the letter S in the encrypted text, it is very likely that the substitution maps E to S.
- https://math.libretexts.org/Bookshelves/Applied_Mathematics/Math_in_Society_(Lippman)/16%3A_Cryptography/16.02%3A_Substitution_CiphersIn the case of a shift cipher, the method is “a shift cipher is used.” The encryption key is the specific amount of shift used. By choosing a random mapping, we could get a more secure cipher, with th...In the case of a shift cipher, the method is “a shift cipher is used.” The encryption key is the specific amount of shift used. By choosing a random mapping, we could get a more secure cipher, with the tradeoff that the encryption key is harder to describe; the key would now be the entire mapping, rather than just the shift amount. Because of the high frequency of the letter S in the encrypted text, it is very likely that the substitution maps E to S.
- https://math.libretexts.org/Courses/SUNY_Schenectady_County_Community_College/Professor_Holz'_Topics_in_Contemporary_Mathematics/03%3A_Number_Bases_and_Modular_Arithmetic/3.05%3A_Cryptography/3.5.02%3A_Substitution_CiphersIn the case of a shift cipher, the method is “a shift cipher is used.” The encryption key is the specific amount of shift used. By choosing a random mapping, we could get a more secure cipher, with th...In the case of a shift cipher, the method is “a shift cipher is used.” The encryption key is the specific amount of shift used. By choosing a random mapping, we could get a more secure cipher, with the tradeoff that the encryption key is harder to describe; the key would now be the entire mapping, rather than just the shift amount. Because of the high frequency of the letter S in the encrypted text, it is very likely that the substitution maps E to S.
