HIGH-SPEED CONTINUOUS-TIME COMPARATOR CIRCUIT
    724.
    发明申请

    公开(公告)号:US20180026618A1

    公开(公告)日:2018-01-25

    申请号:US15394472

    申请日:2016-12-29

    Abstract: A comparator circuit including: a first node and a second node, which receive a first current and a second current, respectively; a first current mirror, which includes a first load transistor and a first output transistor; and a second current mirror, which includes a second load transistor and a second output transistor. The comparator circuit further includes: a first feedback transistor and a second feedback transistor cross-coupled together, the control terminals of the first and second feedback transistors being connected to the first and second nodes, respectively; a first resistor, having a first terminal, which is connected to the control terminal of the first load transistor, and a second terminal, which is connected to the first node and to the control terminal of the first output transistor; and a second resistor, having a first terminal, connected to the control terminal of the second load transistor, and a second terminal, connected to the second node and to the control terminal of the second output transistor.

    Encryption device of a substitution-box type, and corresponding encryption method and computer program product

    公开(公告)号:US09875377B2

    公开(公告)日:2018-01-23

    申请号:US14661862

    申请日:2015-03-18

    Inventor: Filippo Melzani

    CPC classification number: G06F21/72 H04L9/002 H04L9/0631 H04L2209/046

    Abstract: A device of the Substitution-Box (S-Box) type, which is suitable for operating in a symmetric-key encryption apparatus, in particular an AES (Advanced Encryption Standard) encryption apparatus, and includes at least one module configured for carrying out a non-linear operation in a finite field (GF(28)) of an encryption method implemented by the above encryption apparatus, the module including at least one reprogrammable look-up table to, for example, implement countermeasures against side-channel attacks. When no countermeasures are employed, the tables may be set to fixed values, instead of being reprogrammable. The above module includes a plurality of composite look-up tables that implement the non-linear operation in a composite field of finite subfields (GF(24)2; GF((22)2)2) deriving from the finite field (GF(28)), each of the above composite look-up tables being smaller than a look-up table that is able to implement autonomously the non-linear operation in a finite field (GF(28)).

Patent Agency Ranking