<s>
Torus-based	B-General_Concept
cryptography	I-General_Concept
involves	O
using	O
algebraic	O
tori	O
to	O
construct	O
a	O
group	O
for	O
use	O
in	O
ciphers	B-Application
based	O
on	O
the	O
discrete	O
logarithm	O
problem	O
.	O
</s>
<s>
This	O
idea	O
was	O
first	O
introduced	O
by	O
Alice	O
Silverberg	O
and	O
Karl	O
Rubin	O
in	O
2003	O
in	O
the	O
form	O
of	O
a	O
public	B-Application
key	I-Application
algorithm	I-Application
by	O
the	O
name	O
of	O
CEILIDH	B-Protocol
.	O
</s>
