Cryptanalysis of reduced QTL block cipher

• Recently, a new ultra lightweight block cipher called QTL has been proposed. The authors claim to achieve a fast diffusion in QTL by using a new variant of a generalized Feistel network structure that changes all block messages in one iterative round in contrast to traditional Feistel-type structures changing only half of block messages. In this paper, we evaluate the security claims of the designers and show that their claims are not valid as QTL is vulnerable to the standard statistical attacks on block ciphers.

Keyword

Differential cryptanalysis

Linear cryptanalysis

Mixed Integer Linear Programming (MILP)

QTL

Integer programming

Lyapunov methods

Security of data

Fast diffusion

Generalized feistel

Mixed-integer linear programming

Statistical attacks

Type structures

Ultra lightweights

Cryptography

Publication and Content Type

ref (subject category)

art (subject category)