Supporting GnuPG's Default: DSA and Elgamal

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Supporting GnuPG's Default: DSA and Elgamal

by Crypt lib :: Rate this Message:

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Which CryptLib  Encryption/Decryption algorithm matches GnuPG's Default: "DSA and Elgamal"?

Let's use latest version of Ubuntu as a reference point to constrain the GnuPG version - Assuming that is useful.

TIA

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Re: Supporting GnuPG's Default: DSA and Elgamal

by Peter Gutmann :: Rate this Message:

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"Crypt lib" <cryptlib@...> writes:

>Which CryptLib  Encryption/Decryption algorithm matches GnuPG's Default:
>"DSA and Elgamal"?

DSA is CRYPT_ALGO_DSA, Elgamal is CRYPT_ALGO_ELGAMAL.

Peter.


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Re: Supporting GnuPG's Default: DSA and Elgamal

by Crypt lib :: Rate this Message:

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Does not seem to answer the question, and in fact suggests GnuPG is not supported?

One of our vendors specifically stated support for GPG using "DSA and Elgamal", GnuPG's Default is "DSA and Elgamal", and referencing Bruce's Applied Cryptography 2nd ed page 490 clearly states "ELGamal Encryption with DSA" is a legitimate "mixed mode" algorithm, and I've found a large number of confirming posts around the internet.

Again, am I to conclude Cryptlib does not support "DSA and Elgamal" and thus does not support GnuPG's default?

Or are you saying both of those options can be set for a single envelope?

Thanks



On 11/1/08, Peter Gutmann <pgut001@...> wrote:
"Crypt lib" <cryptlib@...> writes:

>Which CryptLib  Encryption/Decryption algorithm matches GnuPG's Default:
>"DSA and Elgamal"?


DSA is CRYPT_ALGO_DSA, Elgamal is CRYPT_ALGO_ELGAMAL.


Peter.



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Re: Supporting GnuPG's Default: DSA and Elgamal

by Peter Gutmann :: Rate this Message:

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"Crypt lib" <cryptlib@...> writes:

>One of our vendors specifically stated support for GPG using "DSA and
>Elgamal", GnuPG's Default is "DSA and Elgamal", and referencing Bruce's
>Applied Cryptography 2nd ed page 490 clearly states "ELGamal Encryption with
>DSA" is a legitimate "mixed mode" algorithm, and I've found a large number of
>confirming posts around the internet.

GPG supports signing with DSA keys and encryption with Elgamal keys, and calls
the result "DSA and Elgamal".  cryptlib also supports signing with DSA keys
and encryption with Elgamal keys.  You have my permission to call it "DSA and
Elgamal" too if it makes you feel any better :-).

Peter.


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Re: Supporting GnuPG's Default: DSA and Elgamal

by Crypt lib :: Rate this Message:

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Understood.

Thank you for the clarification.




On 11/2/08, Peter Gutmann <pgut001@...> wrote:
"Crypt lib" <cryptlib@...> writes:


>One of our vendors specifically stated support for GPG using "DSA and
>Elgamal", GnuPG's Default is "DSA and Elgamal", and referencing Bruce's
>Applied Cryptography 2nd ed page 490 clearly states "ELGamal Encryption with
>DSA" is a legitimate "mixed mode" algorithm, and I've found a large number of
>confirming posts around the internet.


GPG supports signing with DSA keys and encryption with Elgamal keys, and calls
the result "DSA and Elgamal".  cryptlib also supports signing with DSA keys
and encryption with Elgamal keys.  You have my permission to call it "DSA and
Elgamal" too if it makes you feel any better :-).


Peter.



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