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Submitted on: 7/6/2010 9:29:55 AM
By: Black_Berry
Level: Beginner
User Rating:
By 1 Users
Compatibility:VB 6.0
Users have accessed this code
2119 times.
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One of the problems of symmethric crypto-algorithms is the password, which should be sent by Sender and got by the Reciever. When you send to the Reciever the encrypted file, he(she) should know password, the algorithms that was used and the software. But how to keep the password in secret during the sending? That makes sending through Internet encrypted files rather difficult. This is a very simple source-code has a technology just like in my other programs: it works with PRNG and allows to get all attributes of encrypted file, based, for example on the link to this file in Internet. When the Sender created encrypted file, he(she) should know before this the address in Internet, where this encrypted file will be uploaded. This is avaliable for direct links only. For If the Sender is the owner of web-hosting, he(she) sets in this generator full path to file. This value must be set into the generator, after that the generator will creacte values, such as Software, List of algorithms and Password to this file. The Sender should use all these values to encrypt his(her) file. Software and other values may be modiefed as you wish, for example, you can add or remove any title of program in file "soft.txt". The same is about "algs.txt" and "str.txt". "algs.txt" contains of list of algorithms which can be used in the program, listed in "soft.txt". "str.txt" contains a string of symbols, which are necessary for creating password, so you can add or remove any symbol you wish, that is very important if you want to use in your password symbols from your alphabet. The Sender and the Reciever must have equivalent settings, even 1 symbol can be fatal. What should do the Sender:
1) Understand, what shall be the link to encrypted file. The link will be sent to the Reciever.
2) Set the link which doesn't exist yet into the generator
3) Get all values for encrypting file
4) Encrypt file basing on these values
5) Upload the encrypted file to Internet, the link must match the link that was set in the generator before
What should do the Reciever:
1) Get the link that was sent
2) Set that link into the generator
3) Get the values for decrypting file (these values are equivalent as the Sender got before)
4) Decrypt file using these values
You also can choose the amount of algorithmes in the program as in the text file "alg.txt". The amount of algorithmes is necessary when you use cascade encryption with 2 or more algorithmes, so if you want to encrypt file with 2 or more algorithmes, first of all you must see that the amount of algorithm strings in "algs.txt" is larger or the same as 2. Then, check the value "Amount of algs" any value you want, but not larger then the amount of strings in "algs.txt" - strings from "algs.txt" will be shown into the textbox according to pseudo-random generator. If you don't want the strings in "algs.txt" to be repeated in the generator, check the value "Don't repeat algorithmes in list". If you check the value in textbox more then the amount of strings in "algs.txt" and check the value "Don't repeat values" - you'll get the warning message "Unable to generate algorithm list. Not enough alg values in array. Please decrease the value of amount of algorithms to be generated without repeats or add new algorithms into the text file.") All settings in source-code are by default, including the amount of algs [1]. You can also set a hyperlink as it was described earlier in file "example.txt".
UPD: Added new source-code for creating password to crypto-containers with fixed size. See readme for full information.
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