Results 251 to 260 of about 28,334 (305)
Reversible medical image cryptography using spatial XOR-rotation and chaos-driven permutation and diffusion schemes. [PDF]
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Cryptologia, 1995
Questions Thomas Jefferson's attributed invention of the “cylinder cipher,” notes similar devices before and after his time, and introduces a “mystery device” of this nature in the National Cryptologic Museum, Fort George G. Meade MD.
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Questions Thomas Jefferson's attributed invention of the “cylinder cipher,” notes similar devices before and after his time, and introduces a “mystery device” of this nature in the National Cryptologic Museum, Fort George G. Meade MD.
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Cryptologia, 2015
A child prodigy and Harvard University graduate turned serial killer, Theodore Kaczynski—now better known as the Unabomber—constructed elaborate cipher systems to encrypt his thoughts and emotions. His personal journals contain enciphered details of his life, his beliefs and feelings about society, and his crimes.
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A child prodigy and Harvard University graduate turned serial killer, Theodore Kaczynski—now better known as the Unabomber—constructed elaborate cipher systems to encrypt his thoughts and emotions. His personal journals contain enciphered details of his life, his beliefs and feelings about society, and his crimes.
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A Domain Extender for the Ideal Cipher [PDF]
Lecture Notes in Computer Science, 2010 peer reviewedWe describe the first domain extender for ideal ciphers, i.e. we show a construction that is indifferentiable from a 2n-bit ideal cipher, given a n-bit ideal cipher.
Yannick Seurin +2 more
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Cryptologia, 1988
A cipher used by the astronomer Aryabhata (c. 500 A.D.) is described. It converts numbers into letter sequences and a number can be represented by many different cipher sequences. The cipher can be viewed as an example of an encryption paradigm where the encryption is defined by a key class rather than a single key.
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A cipher used by the astronomer Aryabhata (c. 500 A.D.) is described. It converts numbers into letter sequences and a number can be represented by many different cipher sequences. The cipher can be viewed as an example of an encryption paradigm where the encryption is defined by a key class rather than a single key.
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Cryptologia, 1990
An early Indian cipher that dates perhaps as early as 4th century A.D. is described. Basically, this cipher maps numerals into consonants; the vowels between the consonants may be used freely.
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An early Indian cipher that dates perhaps as early as 4th century A.D. is described. Basically, this cipher maps numerals into consonants; the vowels between the consonants may be used freely.
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On the power of cascade ciphers
ACM Transactions on Computer Systems, 1984The unicity distance of a cascade of random ciphers, with respect to known plaintext attack, is shown to be the sum of the key lengths. A time-space trade-off for the exhaustive cracking of a cascade of ciphers is shown. The structure of the set of permutations realized by a cascade is studied; it is shown that only l
Shimon Even, Oded Goldreich 0001
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Cryptologia, 2001
This paper describes the occurrence of codes and ciphers in the detective novels of Dorothy L Sayers and the debt she owed to her contemporary crime writer John Rhode for introducing her to the simple yet very effective Playfair and how to solve it. It was presented to the 1992 convention of the Dorothy L. Sayers Society.
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This paper describes the occurrence of codes and ciphers in the detective novels of Dorothy L Sayers and the debt she owed to her contemporary crime writer John Rhode for introducing her to the simple yet very effective Playfair and how to solve it. It was presented to the 1992 convention of the Dorothy L. Sayers Society.
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CORRESPONDENCE IN CIPHER A CIPHER TYPEWRITER TRADE CATALOGUE
Cryptologia, 1991A description, from a trade catalog, of an early typewriter designed for use as a cryptographic machine, and the need for such a device, followed by excerpts from its patent.
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1997
SPEED is a private key block cipher. It supports three variable parameters: (1) data length — the length of a plaintext/ciphertext of SPEED can be 64, 128 or 256 bits. (2) key length — the length of an encryption/decryption key of SPEED can be any integer between 48 and 256 (inclusive) and divisible by 16.
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SPEED is a private key block cipher. It supports three variable parameters: (1) data length — the length of a plaintext/ciphertext of SPEED can be 64, 128 or 256 bits. (2) key length — the length of an encryption/decryption key of SPEED can be any integer between 48 and 256 (inclusive) and divisible by 16.
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