Invisible Messages

Chemistry is to a large extent invisible in newspapers, news magazines, television, and radio. If the message from chemists and chemical engineers is so... 

Stressing the need to paint certain states of mind stati d animo)," uniquely perceived hy a modernist clairvoyant artist, and to depict those wholly invisible force-lines (linee della forza)" stirring the vitalist universe so beloved of the Occultists, the apocalyptic Futurist message concludes (with italic emphasis), We have proclaimed ourselves to be the primitives of a completely renovated sensitiveness. ... 

The transition metal cobalt has its own artistic history it is used to give a deep blue or sometimes green color to pottery and glass. Anyone who has played with a toy chemistry set has probably made invisible ink, another unusual cobalt product. Invisible ink is made from a compound of cobalt and chlorine. Dissolved in a mixture of water and a common liquid called glycerine, the ink becomes colorless. When a message written in the ink is heated, the water and glycerine break away from the... 

The requirement of the recipient on disputes Once a recipient has accepted a certain message as authenticated by a certain signer (in an authentication transaction), he should win disputes about that message in court. The only exception is with schemes like invisible signature schemes, where disputes only work if the signer cooperates. 

The recipient wishes that any message he has accepted as authenticated should also be accepted by the court if a dispute about this message arises. However, in a minimal requirement fulfilled by invisible signature schemes, too, one has to allow the court to decide that the signer has not cooperated. Hence the result should be TRUE or not cooperated . 

The only requirement ever made in the interest of the signer if she has in fact authenticated the message, i.e., in the lower half of Table 5.2, is the one from invisible signature schemes There, the recipient should not be able to convince a third party, i.e., a court, that the message had been authenticated, unless the signer cooperates. However, the requirement one could make here is only a special case of invisibility, which also deals with dishonest third parties. 

Cobalt chloride solution can he used as an invisible ink. The solution leaves no detectable mark when it is applied to paper with a pen. However, heating the paper reveals the message written hy the pen. Use your results in this experiment to predict the color of cobalt chloride ink on heated paper. 

After dissolving baking soda in some water, you can use it like ink to draw a message onto a piece of paper. Once it dries, it will be invisible to the eye. (Photo by Jim Fordyce.)... 

After a long deliberation, the inventor has decided to use the time separation principle and has chosen to deliver sandwiches exactly when they are needed by means of helicopter drones. As a temporary measure, she will first use the communication drones that are already in use to carry confidential messages among the support team members. Later, special stealth helicopter drones will be ordered (and invented first), which be invisible to other teams and which will fly silently. 

A key feature of this approach is that the standard TCP is not modified, but an intermediate layer, called ad hoc TCP (ATCP), is inserted between IP and TCP (transport) layers. Therefore, ATCP is invisible to TCP and terminals with and without ATCP installed can interoperate. ATCP operates based on the network status information provided by the internet control message protocol (ICMP) and the explicit... 

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