公开(公告)号：US11831771B2

公开(公告)日：2023-11-28

申请号：US17506377

申请日：2021-10-20

Applicant: STMICROELECTRONICS S.r.l. ,  PROTON WORLD INTERNATIONAL N.V.

Inventor： Thierry Simon ,  Michael Peeters ,  Francesco Caserta

IPC: H04L9/30 ,  H04L9/08 ,  H04L9/32

CPC classification number: H04L9/3073 ,  H04L9/0838 ,  H04L9/3247 ,  H04L2209/12

Abstract: Cryptographic circuitry, in operation, generates N first pairs of elliptic curve cryptography (ECC) keys r(i), R(i), with i varying from 1 to N, using K second pairs of ECC keys p(k), P(k), with k varying from 1 to K, wherein K is smaller than N. Each pair r(i), R(i) of the first pairs of keys is a linear combination of pairs of the second pairs of ECC keys according to:





∀
i

∈


[

1
;
N

]

⁢

{






r
⁡
(
l
)

=


∑

j
=
1

K



A
⁡
(

i
,
j

)

*

p
⁡
(
j
)










R
⁡
(
i
)

=


∑

j
=
1

K



A
⁡
(

i
,
j

)

*

P
⁡
(
j
)







,







wherein A(i,j) designates a general term of a matrix A of size N*K, and all the sub-matrices of size K*K are invertible. The cryptographic circuitry, in operation, executes cryptographic operations using one or more pairs of the first pairs of ECC keys.