公开(公告)号：US20210194689A1

公开(公告)日：2021-06-24

申请号：US17129688

申请日：2020-12-21

Applicant: STMICROELECTRONICS S.r.l.

Inventor： Ruggero SUSELLA ,  Filippo MELZANI ,  Guido Marco BERTONI

IPC: H04L9/30 ,  H04L9/14 ,  H04L9/08

Abstract: A method performs cryptographic operations on data in a processing device. An iterative operation between a first operand formed by a given number of words and a second operand using a secret key is performed. The iterative operation includes, for each bit of the secret key, applying one of a first set operations and a second set of operations to the first operand and to the second operand depending on of the bit, and conditionally swapping words of the first and the second operand based on a control bit value obtained by applying a logic XOR function to a random bit.

公开(公告)号：US20130249691A1

公开(公告)日：2013-09-26

申请号：US13840666

申请日：2013-03-15

Applicant: STMICROELECTRONICS S.R.L.

Inventor： Guido Marco BERTONI ,  Fabio TOTA

IPC: G08B13/02

CPC classification number: G08B13/02 ,  G06F21/86 ,  H05K5/0208

Abstract: An embodiment of an apparatus has a closed housing accommodating an element to be protected, and a pressure sensor coupled to a control unit configured to detect pressure variations within the housing upon opening the housing. The control unit is configured to activate countermeasures upon detecting opening of the housing. For example, the apparatus may be a set-top box, a cell phone, a television set, a printer ink cartridge of toner cartridge, or a meter, wherein the element to be protected is a semiconductor chip and relevant couplings, storing an enabling code or key.

Abstract translation: 装置的实施例具有容纳要保护的元件的封闭壳体，以及联接到控制单元的压力传感器，其配置成在打开壳体时检测壳体内的压力变化。 控制单元被配置为在检测到壳体的开口时激活对策。 例如，该装置可以是机顶盒，手机，电视机，调色剂盒的打印机墨盒或仪表，其中待保护的元件是半导体芯片和相关的耦合，存储启用 代码或密钥。

公开(公告)号：US20210226789A1

公开(公告)日：2021-07-22

申请号：US17149623

申请日：2021-01-14

Applicant: STMICROELECTRONICS S.r.l.

Inventor： Ruggero SUSELLA ,  Guido Marco BERTONI

IPC: H04L9/30 ,  H04L9/08 ,  G06F7/523

Abstract: A scalar multiplication operation includes an iterative procedure performing a set of operations at each iteration on a bit or on a group of consecutive bits of a secret key. The multiplication operation includes multiplying values of projective format coordinates by a random value. The random value is a product of a random number generated over a range having as end value a first value, with a second value, which is larger than said first value. The first value is a power of two of a word size multiplied by a multiplier value, minus one. The second value is equal to a power of two of a number of bits of the coordinates divided by the first value. The multiplier value is an integer greater than or equal to one and smaller than a ratio of said number of bits to the word size.

公开(公告)号：US20130114806A1

公开(公告)日：2013-05-09

申请号：US13669213

申请日：2012-11-05

Applicant: STMicroelectronics S.r.l.

Inventor： Guido Marco BERTONI ,  Ruggero SUSELLA

IPC: H04L9/28

CPC classification number: G06F7/728 ,  G06F2207/7238 ,  H04L9/3006 ,  H04L9/302

Abstract: An embodiment concerns a method for encrypting a message through a cryptographic algorithm including a computation of a mathematical function including the computation of one or more modular multiplications. Such a cryptographic algorithm has a respective module. The method, carried out with an electronic device, includes:providing a first parameter; generating a random number; calculating a Montgomery parameter based on said first parameter and on a integer multiple of said random number; generating a representation of the message to be encrypted in a Montgomery domain through a Montgomery conversion function applied to the message and to the Montgomery parameter; carrying out the calculation of the mathematical function on the message represented in the Montgomery domain.

Abstract translation: 实施例涉及通过密码算法加密消息的方法，包括计算包括一个或多个模乘法的计算的数学函数。 这样的密码算法具有相应的模块。 该方法用电子设备进行，包括：提供第一参数; 产生随机数; 基于所述第一参数和所述随机数的整数倍计算蒙哥马利参数; 通过应用于消息的蒙哥马利转换功能和蒙哥马利参数生成要在蒙哥马利域加密的消息的表示; 对Montgomery域中表示的消息进行数学函数的计算。