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Julian Schamper

dblp:136/8691 · DBLP profile ↗
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2ranked-venue papers
0as first author
0since 2021 · last 2014
—ORCID · none

Domains — the database's venue-derived domains; a paper can count in several

Artificial intelligence and machine learning · 2

Expertise — from the expertise taxonomy: the topics of the expert's papers under the CCF categories. A weight counts papers with recency: 1 for a paper about the topic, 0.3 when the topic is its context, halved every five years.

Network and information security
2 papers
Cryptographic primitives and cryptanalysis · 100%

Topics — the 2 heaviest of 3, each with the papers that count most for it

TopicWeightPapersLastEvidence papers
Cryptographic primitives and cryptanalysis › cryptanalysis › cipher cryptanalysis
classical cipher cryptanalysis
0.212014
Improved Decipherment of Homophonic Ciphers · EMNLP 2014
Cryptographic primitives and cryptanalysis › cryptanalysis › cipher cryptanalysis
substitution cipher decryption
0.212013
Beam Search for Solving Substitution Ciphers · ACL (1) 2013

Methods — techniques the papers use, named apart from their topics

beam search · 0.4rest cost estimation · 0.2
YearPublicationVenuePosition
2014 Improved Decipherment of Homophonic Ciphers
abstract
In this paper, we present two improvements to the beam search approach for solving homophonic substitution ciphers presented in Nuhn et al. (2013): An improved rest cost estimation together with an optimized strategy for obtaining the order in which the symbols of the cipher are deciphered reduces the beam size needed to successfully decipher the Zodiac-408 cipher from several million down to less than one hundred: The search effort is reduced from several hours of computation time to just a few seconds on a single CPU.These improvements allow us to successfully decipher the second part of the famous Beale cipher (see (Ward et al., 1885) and e.g.(King, 1993)): Having 182 different cipher symbols while having a length of just 762 symbols, the decipherment is way more challenging than the decipherment of the previously deciphered Zodiac-408 cipher (length 408, 54 different symbols).To the best of our knowledge, this cipher has not been deciphered automatically before.
Malte Nuhn, Julian Schamper, Hermann Ney
EMNLP2
2013 Beam Search for Solving Substitution Ciphers
Malte Nuhn, Julian Schamper, Hermann Ney
ACL (1)2