Data encryption standard (DES)

Since the current state of knowledge does not allow us to prove such claims, we formulate instead mathematical assumptions regarding the computational difficulty of this set of problems, and prove properties of the protocols we develop based on these assumptions

Alex Biryukov; Christophe Cannière

2006

Scholarcy highlights

  • Steganography is the art and science of hiding information by embedding messages within other, seemingly harmless messages.Steganography means “covered writing” in Greek.As the goal of steganography is to hide the presence of a message and to create a covert channel, it can be seen as the complement of cryptography, whose goal is to hide the content of a message.A famous illustration of steganography is Simmons’ “Prisoners’ Problem” : Alice and Bob are in jail, locked up in separate cells far apart from each other, and wish to devise an escape plan
  • Since the current state of knowledge does not allow us to prove such claims, we formulate instead mathematical assumptions regarding the computational difficulty of this set of problems, and prove properties of the protocols we develop based on these assumptions
  • Word-wise truncated differences are differences in which the difference itself is not considered, but instead the differences are divided into two classes, namely zero differences and nonzero differences. In these cases the data blocks are divided to words, and the analysis only considers whether the difference of a word is expected to be zero or not
  • They are allowed to communicate by means of sending messages via trusted couriers, provided they do not deal with escape plans
  • “A practical public-key cryptosystem provably secure against adaptive chosen ciphertext attack.” Advances in Cryptology—CRYPTO’98

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