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Furthermore, although there are many server-side applications that can implement full-text searching of chat messages at higher processing speeds, it is technically difficult to search messages without disclosing information to the server, and this is another feature that is not yet supported by any applications.

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Consequently, there will probably be frequent changes to the members of the chat rooms and messaging services as people move to new positions, new employees arrive, and older employees leave. In the business chat system introduced here, the shared key is updated by multi-cast key distribution when changes are made to the chat room members, for example, organization changes or changes of personnel.

Multi-cast key distribution. Table 1.

Furthermore, roomss to a safety assessment of typical messaging applications carried out by the Electronic Frontier Foundation [3], users are becoming much more interested in the specific security measures of each application and in how these measures are implemented. As a result, we have developed the following three techniques: Multi-cast key distribution [4] Proxy re-encryption Searchable symmetric encryption An overview of a business chat system to which these techniques have been applied is shown in Fig.

This article introduces the encryption technology used in this prototype system.

Business chat rooms

Since the shared key is generated by performing advanced calculations from secret information held by each user and the key derivation server, the shared key itself is not sent between the user and the key derivation server, and there is no way that the shared key can be known by the key derivation server. This is much more efficient than sharing keys among users directly. However, for business-oriented applications, it is assumed that there will be many users.

System overview and technical features of encrypted business chat system. Table 1 compares the average processing times needed for logging in, exchanging messages, and performing keyword searches in a conventional chat system and in a chat system with the addition of the above three functions.

Examples of small business chat rooms

However, when keys are shared among large s of clients, this two-user key sharing protocol must be performed repeatedly, which is inefficient. Future prospects We have devised encryption schemes for secure business chat systems that prevent eavesdropping and leakage of information from the server. At NTT Secure Platform Laboratories, we are working on a prototype secure business chat system that not only prevents leakage from terminals by not business chat rooms any data on the terminals, but also makes it possible to exchange and search messages without disclosing any secrets to the server.

The user uses the search key to send secret queries, and the server uses the secret queries and concealed index to search for the corresponding data without decrypting any of the data, and then sends the back to the user Fig. Screen shot of an existing business chat application after applying the three functions. In this way, we can perform re-encryption more efficiently than conventional proxy re-encryption techniques.

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In the business chat system introduced here, the shared key is updated by multi-cast key distribution when changes are made to the chat room members, for example, organization changes or changes of personnel. Furthermore, although there are many server-side applications that can implement full-text searching of chat messages at higher processing speeds, it is technically difficult to search messages without disclosing information to the server, and this is another feature that is not yet supported by any applications.

It is also possible to add new users and delete existing users, and the system includes a mechanism that updates the keys every time such an event occurs. This is much more efficient than sharing keys among users directly. Following accusations of communication insecurities made by the former Central Intelligence Agency employee Edward Snowden [1] and by WikiLeaks [2], people have started to business chat rooms that these chat room applications may be subject to eavesdropping and data theft by governments and messaging service providers.

Furthermore, according to a safety assessment of typical messaging applications carried out by the Electronic Frontier Foundation [3], users are becoming much more interested in the specific security measures of each application and in how these measures are implemented.

Trader chat rooms part of bigger problem

These shared keys can then be used to keep the communication secret. With conventional encryption methods, it is therefore technically difficult to implement end-to-end encryption while preserving data on a server, and in fact, no applications have yet achieved this. Future prospects We have devised encryption schemes for secure business chat systems that prevent eavesdropping and leakage of information from the server. In summary, there are three confidentiality issues that need to be addressed in business chat systems.

As a result, we have developed the following three techniques: Multi-cast key distribution [4] Proxy re-encryption Searchable symmetric encryption An overview of a business chat system to which these techniques have been applied is shown in Fig.

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System overview and technical features of ubsiness business chat system. We are also considering the possible application of this technology to other areas such as virtual private networks or systems and are working to put it to practical use. Evaluation We applied the above techniques to an existing business chat application in order to evaluate them.

However, when keys are shared among large s of clients, this two-user key sharing protocol must be performed repeatedly, which is inefficient. Searchable symmetric encryption.

Trader chat rooms part of bigger problem

An example of a key sharing protocol business chat rooms operates between two clients is the Buwiness key exchange, which is the protocol used by most existing busjness chat systems. Thus, even if a chat room member update occurs, the messages are never disclosed to the server and can only be decrypted by current chat room participants. Table 1 compares the average processing times needed for logging in, exchanging messages, and performing keyword searches in a conventional chat system and in a chat system with the addition of the above three functions.

With conventional proxy re-encryption techniques, the computer processing needed to re-encrypt all the encrypted chat data would be too slow to be of practical use for a business chat system. For example, a ciphertext addressed to user A bisiness message server S could be transformed re-encrypted by server S using a re-encryption key so that it can be decrypted by user B. Implementing dhat chat functions with end-to-end encryption Storing encrypted chat data on a server and enabling the members authorized to view the data to be modified and updated as the chat room members are modified and updated Allowing full-text searching of chat messages on the server while maintaining the secrecy of chat information on the server 3.

Consequently, there will probably be frequent changes to the members of the chat rooms and messaging services as people move to new positions, new employees arrive, and older employees leave. Even if new users are added, these cchat can also generate secret keywords and carry out searches using them.

This article introduces the encryption technology used in this prototype system. If Adobe Reader roojs not installed on your computer, click the button below and go to the download site.

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In a searchable symmetric encryption, the user generates a key search key and uses it to make a secret index to the data that are not disclosed to the search server. We are also considering the possible application of this technology to other areas such as virtual private networks or systems and are working to put it to practical use. For example, a ciphertext addressed to user A on message server S could be transformed re-encrypted by server S using a re-encryption key so that it can be decrypted by user B.

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