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PGP DESKTOP -RSA LEGACY KEY

Created: 13 Jul 2012 | 6 comments

Any information or tips is much appreciated!!

There is an encrypted file and user 1's private key (RSA LEGACY) is used to decrypt it. User 1 gave an user 2 user access to his private key so that he can decrypt the file in case he is not available. This was all working but then I upgraded user 2 7.0 to PGP 10.2 and he imported the keys back into PGP 10.2 desktop the file can no longer be decrypted by user 2. Using user1's RSA Legacy Key.

 

Also on user 1's key properties the Trust value is no longer on Implicit and it’s grayed out and cannot be selected. (Public Key)

 

User 2 had 7.0 PGP on his desktop before and his laptop was not encrypted (Unmanaged PGP Desktop).

 

Also would like to download PGP 7.0

 

Please let me know if there are any steps and procedures we can take at this point in order to decrypt the file using 10.2. with an RSA Legacy Key

 

Thank you,

ITMO74

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Tom Mc's picture

Both because it is described as "Public Key" and it cannot have Trust set to Implicit, it appears that the imported key is only the public key instead of the key pair.  Most likely, when the key was exported, the individual did not make the needed selection for the export to include the private key.  It looks like you need to export the key again, making sure to include the private key; after importing, you need to set Trust to Implicit.

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Tom Mc's picture

Just in case clarification is needed.  Your problem would not be related to the use of a Legacy RSA key.  Although PGP has stopped having the ability to generate these older RSA keys, PGP remains backwards compatible in the ability to use them.

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itmo74's picture

Thank you for your reply, We will try to import user 1's private key pair and see if that decrypts

the file.

 

Thanks Again,

ITMO74

itmo74's picture

Thank you for the advice. After importing the private keypair and we are able to sign,verify, change the trust, and decrypt the file. Now we ran into another issue.

 

Please let me know if you there is a solution for this. Again any advise is much appreciated. Thanks again

After the file is decrypted now it is showing up as a SIG File extension. If we open it with notepad the file will open but it is just bunch of letters and different characters.

Tom Mc's picture

What was the file extension of the file that was encrypted?  Was it the appropriate extension for the type of file?  What software was used to encrypt the file?

I'm not sure what is actually occuring, but it might a situation that can be corrected by going to the Advanced tab of PGP Options and enabling Ignore Embedded File Names When Decrypting; or if this is enabled, by disabling it.

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morphingstar's picture

Was SIG not a file type around 10 years before Millenium? Would not be plain text, may be compression.

You would need software and DOS or Win3 for ".SIG files.

Just tickles my memory - can be wrong