Main features of Cryprite Subway

Cryprite Subway (C-Subway, or Subway) is a straightforward uninterruptable file transfer programme, operating in real time via modem-to-modem connection, which does it's job reliably, simply, efficiently and does not attempt to be anything else! It provides optional automatic encryption and compression, using the File Cryprite encryption engine.

Subway operates in 3 basic modes:

  • Simple terminal (Dial-Answering): a one-to-one (encrypted or non-encrypted) file exchange;
  • Client-bank exchange using subscribers (users) personal input/output boxes: one host- "bank" - stays constantly in answer mode and subscribers dial in to this host and exchange files to/from their personal boxes;
  • Multi-client-bank exchange for remote offices or work groups where each member can be designated either as the "Bank" or a "Client", choosing Answer or Dial mode as appropriate.

To use Subway requires merely the availability of a computer, Windows, modem and phone line on both ends of the connection. No additional software (besides Subway) or hardware or Internet service provision is required. The only additional expense is the price of the phone call.

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The main features of Subway are:

  • Simple: Just take it and use it (in any basic mode). No further script programming is needed: Subway is always ready to serve you;
  • Symmetric: No matter who is dialing or answering, files are communicated in both directions during the one call;
  • Automatic: The user only specifies the task - to whom and what to send or receive. All the details are then performed automatically by Subway without the user's involvement;
  • The speed of Subway depends on the quality of phone lines available, but typically is the same as the speed of a modem connection with the Internet. Compared to a fax, for example, Subway is 10-100 times faster. The encryption speed of Subway is the same as the speed of Fcr (and exceedingly greater than any data transfer speed). The actual data transfer speed of Subway for normal quality phonelines is in range 1-6 Kbytes/sec (9000-50000 bit/sec, or 16-3 min/Mbyte), and even 2-12 Kbytes/sec (8-1 min/Mbyte) taking into account its compression.
  • Subway provides multi-z-modem - uninterruptable z-modem protocol - channel - for each subscriber. In the event of channel interruption, it automatically resumes from the point of breakdown. Subway can truly and efficiently transfer large amounts of information: it's no problem for Subway to transfer 4-30 Mbytes per hour, or 30-200 Mbytes of data during one night or several hundreds of Mega-bytes during several nights (with daylight interrupts);
  • Archiving of sent files: Subway can keep all sent files in compressed form;
  • Subway is very convenient as a database for correspondents / subscribers incoming / outgoing files;
  • By the way, by using SecretList utility of F-Cryprite you can by one click encrypt / decrypt all Subway database files;
  • Automatic / manual switching to "standard" mode for communicating with standard telecommunication utilities (Z-modems);
  • Voice to modem (from voice mode to Subway data exchange) switching, and back again, during the same phone call - additional calls not required;
  • Administrators control of access to subscribers boxes, passwords and data files;
  • Subway sends files copied to "out" boxes, or, if the file is very large, by creating shortcuts to it in "out" boxes;
  • Subway provides automatic files forwarding from user to user;
  • Due to Fcr technology, all passwords of Subway can have any arbitrary length from 0 up to 512 bytes. For work with long passwords, Subway can read passwords from files. Password files can be located on "key" diskettes or CDs, etc.

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The current plan of Subway development foresees a light CEC (Cryprite Exchange Center - see "Main features of File Cryprite") variant when the users will exchange files, by option, not in real time from modem to modem, but through the intermediate Internet server (Sub-CEC), with encrypted transfer and encrypted storage of the files wherever they are.

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System requirements:

  • C-Subway works in Win-95, 98, 2000, NT, Dos (a separate version called Simterm with a command line / half-interactive interface).
  • At least 8 Mb RAM is required for Subway (and no RAM restrictions for Simterm), no conflicting software.
  • Installation file C-Subw_.exe is 1.8Mb (it takes about 10 minutes to download on normal phone/internet line and then about 30 seconds to install Subway). Disk space requirements: 3.8Mb (the size of installed version), but then, if you create subscribers to use their in/out boxes for data storage - the size of the entire system maybe as large as you do it. The minimum necessary command line kernel (Simterm.exe) is 250Kb.

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