Apparatus for protecting an electrical device embodied as a cryptographic device against unauthorised access, • wherein the apparatus is embodied as a releasing apparatus, which is provided for making the electrical device permanently unusable, • wherein the releasing apparatus has an individual button for closing an electrical contact and a covering for covering the button, • wherein the button is covered by the covering and wherein the covering is provided for preventing an unintentional activation of the button, • wherein the covering is connected to the housing, in particular to a housing front of the electrical device, such that it cannot be released from the outside by means of the fastening elements (6, 7) and such that it is only possible to replace the covering after opening the housing of the electrical device, • wherein the covering is provided to prevent an activation of the button in a normal operating mode of the electrical device and only to enable an activation of the button when the covering is at least partially removed, • wherein a spacing exists between covering and button such that an unintentional activation of the button when pressing on the covering is impossible, • wherein the underlying button is only exposed once the covering has been bent upwards, and is therefore accessible such that it can only be activated after being exposed, • wherein the button is arranged in a depression of the housing of the electrical device, in particular in the device front thereof, • wherein the button is designed such that its activation area is not higher than the stationary edge of the button, so that the button cannot be activated by accident if pressure is exerted upon the covering, • wherein, for a possible releasing procedure, it is necessary to engage into the depression with a finger and, from there, to bend the covering upwards and break it off in the region of a predetermined breaking point, wherein in this context a covering seal is also broken, so that it can be seen that the releasing apparatus has unambiguously been used in a manner which is visible from the outside, and wherein only after making the button accessible in this manner can it also be activated. • wherein the apparatus is embodied as a releasing apparatus, which is provided for making the electrical device permanently unusable, • wherein the releasing apparatus has an individual button for closing an electrical contact and a covering for covering the button, • wherein the button is covered by the covering and wherein the covering is provided for preventing an unintentional activation of the button, • wherein the covering is connected to the housing, in particular to a housing front of the electrical device, such that it cannot be released from the outside by means of the fastening elements (6, 7) and such that it is only possible to replace the covering after opening the housing of the electrical device, • wherein the covering is provided to prevent an activation of the button in a normal operating mode of the electrical device and only to enable an activation of the button when the covering is at least partially removed, • wherein a spacing exists between covering and button such that an unintentional activation of the button when pressing on the covering is impossible, • wherein the underlying button is only exposed once the covering has been bent upwards, and is therefore accessible such that it can only be activated after being exposed, • wherein the button is arranged in a depression of the housing of the electrical device, in particular in the device front thereof, • wherein the button is designed such that its activation area is not higher than the stationary edge of the button, so that the button cannot be activated by accident if pressure is exerted upon the covering, • wherein, for a possible releasing procedure, it is necessary to engage into the depression with a finger and, from there, to bend the covering upwards and break it off in the region of a predetermined breaking point, wherein in this context a covering seal is also broken, so that it can be seen that the releasing apparatus has unambiguously been used in a manner which is visible from the outside, and wherein only after making the button accessible in this manner can it also be activated.