# verify.ho

### Description

The `verify.ho`

function allows to estimate the quality of a model (an attack) with a hold-out approach.

### Usage

1 |

### Arguments

`model` |
A model such as randomForest, gaussian, svm, etc. |

`filter` |
A feature selection such as filter.PCA, filter.mRMR, etc. |

`Xlearn` |
A matrix where each row is a physical measure for the training set. |

`Ylearn` |
A vector where the |

`Xval` |
A matrix where each row is a physical measure for the validation set. |

`Yval` |
A vector where the |

`nbreVarX` |
The number of variables which represents each physical measure after the reduction by the feature selection. |

`param.model` |
A list of parameters to insert into the model. |

`param.fs` |
A list of parameters to insert into the feature selection algorithm. |

`...` |
Currently ignored. |

### Details

The `verify.ho`

function estimates the quality of the attack with a hold-out approach. It cuts randomly the set of observations in two subsets. The first one is retained as the training and the second is used for the validation phase where the quality of the model is estimatedby counting the number of time where model predicts correctly the key.

### Value

The `verify.ho`

function returns an object which can be used with the `plot`

function to plot the quality of the model.

The value of this function is an object of class `verify.ho`

, which is a list with the following components:

`TP` |
number of true positive |

`TN` |
number of true negative |

`FN` |
number of false negative |

`FP` |
number of false positive |

`dim` |
the number of variables which represents each physical measure after the reduction by the feature selection. |

### Author(s)

Liran Lerman llerman@ulb.ac.be & Gianluca Bontempi gbonte@ulb.ac.be@ulb.ac.be & Olivier Markowitch olivier.markowitch@ulb.ac.be

### Examples

1 2 3 4 5 6 7 8 9 10 11 12 | ```
#data collection
data(powerC)
traces = powerC[,-301]
traces = powerC[,1:10]
key = powerC[,301]
newIndice = sample(1:256)
traces = traces[newIndice,]
key = key[newIndice]+1
#model checking
attack=verify.ho(model=gaussian,filter=filter.PCA,Xlearn=traces[1:128,],Ylearn=key[1:128],Xval=traces[128:256,],Yval=key[128:256],nbreVarX=c(3:4))
plot(attack)
``` |