Functions that deal with public key crypto?

This is a discussion on Functions that deal with public key crypto? within the C++ Programming forums, part of the General Programming Boards category; Okeydokey, Im not a big cryptography fan, as im a firm believer that if somebody wants your data, they are ...

  1. #1
    That Creepy Network Guy DeepBlackMagic's Avatar
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    Functions that deal with public key crypto?

    Okeydokey, Im not a big cryptography fan, as im a firm believer that if somebody wants your data, they are going to get it no matter what you do with it, however recently I have found it necessary (been ordered to) start integration of basic public/private key pair cryptographic coding. I understand this stuff in theory, but what i really need is some working, portable, easy to understand, key generation and interaction code. Yes, before you go screaming stfw, rtfm, or any of that good stuff, know that yes, i have, and it wasnt good enough. I want to know how keys of varying length are created, and how they are used. Basically what im looking for are 3 functions. GenerateKeyPair, EncryptUsingMyPrivateKey, DecryptUsingTheOtherGuysPublicKey. There are about a million tutorials on how to set up key based crypto for various services, clients, and pre-created libs, but what i want to see is simple example code behind it. Thanks for your time.

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    Registered User Codeplug's Avatar
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    http://www.amazon.com/exec/obidos/tg...lance&n=507846

    Quick awnsers:
    Use SHA1 to generate keys.
    Use tripple DES (3DES) and 128 bit keys and encrypt/decrypt (they're not going to "get it" anytime soon).
    Use Diffie-Hellman key exchange algorithm.
    Use Google to find out about any of the above.

    gg
    Last edited by Codeplug; 11-29-2003 at 07:22 AM.

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    Get OpenSSL. It has lots of crypto functions for you to use.

  4. #4
    Toaster Zach L.'s Avatar
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    I'd use an elliptic curve based key exchange protocol. Diffie-Hellman isn't quite as strong as it seems.
    The word rap as it applies to music is the result of a peculiar phonological rule which has stripped the word of its initial voiceless velar stop.

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    C++ Developer XSquared's Avatar
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    Just use Rijndael encryption.
    Naturally I didn't feel inspired enough to read all the links for you, since I already slaved away for long hours under a blistering sun pressing the search button after typing four whole words! - Quzah

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  6. #6
    Toaster Zach L.'s Avatar
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    Originally posted by XSquared
    Just use Rijndael encryption.
    But thats a private key algorithm. It needs to be built in with a more complex cryptosystem.
    The word rap as it applies to music is the result of a peculiar phonological rule which has stripped the word of its initial voiceless velar stop.

  7. #7
    C++ Developer XSquared's Avatar
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    Isn't 3DES symmetrical too?
    Naturally I didn't feel inspired enough to read all the links for you, since I already slaved away for long hours under a blistering sun pressing the search button after typing four whole words! - Quzah

    You. Fetch me my copy of the Wall Street Journal. You two, fight to the death - Stewie

  8. #8
    Toaster Zach L.'s Avatar
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    Yeah, it is. You're right, Rijndael would probably be a wiser choice for the symmetric ciper in the cryptosystem layed out.

    DeepBlackMagic, you might want to look into Crypto++.
    The word rap as it applies to music is the result of a peculiar phonological rule which has stripped the word of its initial voiceless velar stop.

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