Penetration Testing mailing list archives
Re: AES-256 encryption
From: cwright () bdosyd com au
Date: 19 Aug 2007 22:11:45 -0000
Hello, A weak password has nothing to do with this. I did not see any mention that the key was captured, just the file to be decrypted. If the key file is captured this is a separate issue and nothing to do with AES. There is NO password stored with the encrypted file. A password is used to protect the key, but a key is always to be considered compromised if it is intercepted. The password takes no place in the encryption scheme. I would suggest that you have a read on the encryption protocol specifications. Regards, Craig -----Original Message----- From: listbounce () securityfocus com [mailto:listbounce () securityfocus com] On Behalf Of adrian.floarea Sent: Friday, 17 August 2007 1:49 AM To: 'R Buena' Cc: 'Kush Wadhwa'; pen-test () securityfocus com; forensics () securityfocus com Subject: RE: AES-256 encryption As I say to Kush in a private email, it is almost impossible to crack a file which is encrypted in a proper way with AES. But, if the password used for encryption is a week password (like 1234 or abcd etc) with a specialized tool you can break the encryption. Even, if the password is weak some tools cannot decrypt the files, because do not understand the format of the document (for example, if the document is a PKCS#7 structure), so in this case you must use an appropriate tool. This was the sense of my words. Hope to help you. Regards, Adrian Floarea, CISA Business Development Manager SC CERTSIGN srl Central Business Park 133, Calea Şerban Vodă St., Building C1, 2nd floor 040205 Bucharest 4, Romania -----Original Message----- From: R Buena [mailto:dreamsbig () gmail com] Sent: Thursday, August 16, 2007 6:09 PM To: adrian.floarea Cc: Kush Wadhwa; pen-test () securityfocus com; forensics () securityfocus com Subject: Re: AES-256 encryption Just curious, what if the program was KeyPass or PasswordSafe? and you don't know the passphrase? On 8/14/07, adrian.floarea <adrian.floarea () uti ro> wrote:
Hi Kush, Please tell me if you know the program which was used for encrypt the file and also the used password. If not, I am afraid that will be impossible for you to decrypt the file. There are some good programs for decrypt files (for example Passware) but with limited functionalities. For example if was used for encryption a good password (more than 6-7 characters, numbers or special characters) it is almost impossible to recover the file. Regards, Adrian Floarea, CISA Business Development Manager SC CERTSIGN srlr Central Business Park 133, Calea Şerban Vodă St., Building C1, 2nd floor 040205 Bucharest 4, Romania -----Original Message----- From: listbounce () securityfocus com [mailto:listbounce () securityfocus com] On Behalf Of Kush Wadhwa Sent: Tuesday, August 14, 2007 1:36 PM To: pen-test () securityfocus com; forensics () securityfocus com Subject: AES-256 encryption Hello All, Is there any way to decrypt a file which is AES-256 encrypted? I used many of the tools but I was not able to decrypt it. Please help me if any one knows how to decrypt it Regards, Kush Wadhwa
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Current thread:
- RE: AES-256 encryption, (continued)
- RE: AES-256 encryption adrian.floarea (Aug 14)
- Message not available
- Re: AES-256 encryption R Buena (Aug 16)
- RE: AES-256 encryption adrian.floarea (Aug 16)
- Message not available
- RE: AES-256 encryption adrian.floarea (Aug 20)
- Re: AES-256 encryption Michel Pereira (Aug 21)
- RE: AES-256 encryption Dereck Martin (Aug 21)
- Re: AES-256 encryption dante (Aug 22)
- RE: AES-256 encryption Dereck Martin (Aug 22)
- Re: AES-256 encryption R Buena (Aug 16)
- RE: AES-256 encryption Mike Messick (Aug 22)