Circuit for a combined key value-dependent exchange and randomization of two values

A circuit for a combined key value-dependent exchange and

• randomization of two values, comprising:
• an exchange and randomizing circuit;
• a control input circuit configured to split a key value into two or more shares and to supply the two or more shares to the exchange and randomizing circuit,
• wherein the exchange and randomizing circuit is configured to
• supply each of the two values to one of two inputs, wherein which value of the two values is supplied to which input of the two inputs depends on a first share of the two or more shares and does not depend on a second share of the two or more shares;
• arithmetically combine, for each of the two inputs, the value supplied to the input with a randomization value to generate a respective randomized value;
• and
• store the randomized values in two result locations, wherein which randomized value is stored into which result location of the two result locations depends on the second share of the two or more shares and does not depend on the first share of the two or more shares.