Übersetzung für "Hash chain" in Deutsch

In another variant the EANCV values form what is termed a hash chain.

The authentication token is formed in another embodiment variant by a value of a hash chain.

A hash chain is the repeated application of a cryptographic hash function to a particular data object.

These may specify a value range WB in each instance and an optional anchor value HC-ANCHOR of the respective hash chain.

The respective next value H (n?1) of the hash chain will then be used as the authentication token.

In an embodiment variant of the method the authentication token is formed by a value of a hash chain.

Over a series of sessions, these individual hash inputs generate a hash chain that authenticates a single user input in greater depth.

The last value Rn of the hash chain represents the so-called anchor, which is characterized with ANCHOR in the subsequent drawings.

In some embodiments, if a sensor node S now transmits a data value Mess in a status message M at a specific point in time, then it also transmits in the status message the value of that value of the hash chain, which corresponds to the current point in time.

The receiver, i.e., the central processor GW, may also check, before it uses a received data value Mess, whether the corresponding value of the hash chain was made known for the current point in time.

An attacker can therefore no longer incorrectly use a value range message during its overall validity duration, but instead only provided the validity of the value range message WBS is confirmed by the sensor node S by publishing the current value of the hash chain.

An example value range message WBS with a validity duration G of ten minutes and length “length” of the hash chain HC of ten elements is shown by way of example in FIG.

The value range message WBS may therefore contain additional specifications relative to the hash chain HC, namely the anchor value ANCHOR and its length (length).

A temporal range is assigned to each element of the hash chain (start, end), which is specified in abbreviated form for the representation in the format MMSS (MM minute, SS second).

In one variant, the sensor node provides several value range messages, which each specify a different value range and each contain the anchor value of a respectively different hash chain.

Depending on the current data value, the current value of the hash chain will publish that value range message in which value range the current measured value lies.

In accordance with one embodiment, only the actual value of the associated hash chain still needs to be transmitted to the central processor GW.

This contains the data which is shared by the individual value range messages WBSi (with i-1 to n, here: n=4), namely the unique identifier S-ID, the validity time frame G and possibility the length of the hash chain HC length.

In some embodiments, a value range defined by the bounds LOW and HIGH may be represented in each instance by a hash chain.

In a further variant, a further hash chain can be provided, which represents the pseudo value range “Out of range”, i.e., the current measured value does not fall into one of the existing value ranges.

The connection alternatively constitutes a hash chain in the case of which a hash value of the updated EANCV value is derived from the previous EANCV value.

Thus the wake-up token reference value WUTRV and the wake-up token WUT are taken from a hash chain which is known both to the transmission and receiving node.

In one possible embodiment of the method, the wake-up token and the stored wake-up token reference value are formed by two adjacent members of a hash chain consisting of hash values.

Subsequently the last chain element of the calculated initialization hash chain is distributed as an initialization function value to at least one receiver or to the other field devices.

When this is done, the transmitter or the transmitting field device respectively signs an initialization function value hn with a private cryptographic key Kpriv in an initialization phase IP and distributes the signed initialization function value hn, which forms the last chain element of the initialization hash chain, to the other field devices.