Hashing key

Encrypt Hash Key Using Personal Private Key Witness Signature ... 

Tab. 16.5. Molecular hash key descriptor model for the Palm dataset.

Thus the hash code is not used as a direct way to access data rather it serves as an index or key to the filed data entry (Figure 2-66). Since hash coding receives unique codes by reducing multidimensional data to only one dimension, information gets lo.st. Thi.s los.s prevents a recon.struction of the complete data from the hash code. 

Hashed fingerprints, structural keys 2D structure See Section 12.2... 

Extract the next layer, decrypt the contents with the public key provided by the author, and check the contents. This is the hash code for the document generated when it was originally signed. 

Linear representations are by far the most frequently used descriptor type. Apart from the already mentioned structural keys and hashed fingerprints, other types of information are stored. For example, the topological distance between pharmacophoric points can be stored [179, 180], auto- and cross-correlation vectors over 2-D or 3-D information can be created [185, 186], or so-called BCUT [187] values can be extracted from an eigenvalue analysis of the molecular adjacency matrix. 

In order to sign a record, the record and the private key form the inputs to a hashing process. 

Because hashing is a one-way function and the output of the function has a low probability of collisions, hashing can be used with the cryptographic product or services family for authentication, nonrepudiation, and data integrity. An example of these is the Digital Notary.3 Hashing is also a key element in the DSA. 

For each block Xr, a cryptographic hash H(K, m, n, Xr) (such as MD5, [6]) is computed, where K is the user s key. The first kl bits of the hash output, treated as a k x l rectangular array, are XORed with the current watermark block Wr to form a new binary block Cr. Each element of Cr is inserted into the least significant bit of the corresponding element in Xr, generating the output block X r. 

V. After arrival agent requests the container to decrypt the carried random value with container s secret key N = DJN), then agent computes K = h(h(KJ N ), if hashed result h(K ) is equal to carried h(K) agent uses this as decryption key. 

For that purpose a secure timeserver is introduced. In this role an agent running within the platform is acting. The time agent supports two modes of operation as described in [1] forward-time hash function and backward-time hash function. The forward-time constructions permit key generation only after a given time. And the backward-time constructions permit key generation only before it. 

The hash value of target container s secret key h(KB) equals the hash value returned by the Platform Manager. 

Before any large number or alphanumeric key is used for addressing a record in the direct access file, it must be transformed into a number between 1 and N, N being the length of this file. The procedure employed for such transformation is called hash algorithm (ref. 5). 

Any such algorithms must inevitably cause more different input keys to produce identical address. This effect which is immanent to all hash algorithms is known as the address collision and programers must provide a way to calculate the consecutive addresses (an address increment) until an adequate address is reached. 

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