Tagged Questions

Disk encryption protects information by encrypting every byte that is written to a HD or virtual disk volume.

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?, software/hardware solution(s) for encrypt/decrypt of NAS(s)/SAN(s) that vary in size. LUNs are 4tb+ [migrated]

well hello newbie..first of...with truecrypt & bitlocker totally out of the question (the security issues), what software solution would you recommended to be used to encrypt/decrypt (on the fly ...
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0answers
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Mounting internal FileVault encrypted drive in 10.9 OS X in Recovery Mode without unlocking it; Passware brute-force [migrated]

I encrypted my internal hard drive with FileVault a while ago on Lion such that it prompts for the disk password when I restart the computer and recently upgraded to Mavericks on my MBPro Retina. It ...
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0answers
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Ability to locate free sectors on an encrypted volume

I am trying to understand, generally how could this be a security issue ? Assuming the volume's backing media has this weakness (lets say an NTFS sparse file based TrueCrypt container) what could the ...
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2answers
101 views

How do disk encryption programs solve the “IV problem”?

I was reading a paper on the "elephant diffuser" used in BitLocker and it got me wondering how other systems (e.g. TrueCrypt before it shutdown) solved the problem the elephant diffuser was meant to ...
3
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1answer
77 views

Galois field step in XEX mode

I'm reading through the XEX mode spec, and I want to make sure I've understood the $\alpha^j$ step correctly: $X = E_K(I) \oplus \alpha^j$ $C = E_K(M \oplus X) \oplus X$ where: $M$ is the ...
3
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1answer
900 views

Why is Serpent faster than AES in this benchmark?

I have a laptop without the AES-NI CPU instructions but with SSE4.1. I'm using Linux and tried the (in-memory) cryptsetup benchmark to get the rough tendency which returned: ...
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0answers
26 views

Is there a flaw in whole disk encryption vs volume or folder encryption? [duplicate]

My company just implemented whole disk encryption on all laptops (Symantec) and the concept seems flawed. Please correct me if I'm wrong, but if I have known file in plain text and that same file in ...
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2answers
539 views

Why do we use XTS over CTR for disk encryption?

I'm taking Prof. Boneh's crypto class from Coursera, and am unsure on the requirement for XTS mode for disk encryption. It seems that CTR mode would do exactly what XTS can do, but is simpler to ...
2
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1answer
314 views

How is LUKS dm-crypt secure if the key is stored with the encrypted data?

I've posted this question over at superuser, but haven't had any success at getting answers. That's why I've posted it here. Furthermore, I believe this is a more appropriate place for it as it is ...
2
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1answer
153 views

Is it possible to tweak AES-GCM so that it is satisfactory for whole-disk encryption (like XTS mode)?

Is it possible to leverage a preexisting implementation of AES-GCM to provide the key security benefits essential for full-disk encryption (similar to AES-XTS)? GCM is a popular encryption mode ...
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1answer
218 views

Testing if a password for an eCryptfs mount is valid [closed]

I'm using "eCryptfs" on several directories on my dedicated Debian server. I mount them manually via mount -t ecryptfs [dir] [mountpoint] But after some weeks ...
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2answers
106 views

What can a master password also be called?

When having a company computer that is full disk encrypted, it is common that the boss have a master password / backdoor, so the data always can be decrypted. I have heard some call this for "scrow" ...
6
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1answer
769 views

How can disk encryption systems (like Truecrypt) resist frequency analysis when they allow random access?

I don't understand how disk encryption (e.g. TrueCrypt) is supposed to resist frequency analysis. If blocks can be randomly accessed (which they can), doesn't that mean that frequency-domain ...
23
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3answers
2k views

Information leakage from the ecryptfs filesystem

I'm wondering what information might be leaked from the ecryptfs filesystem. This is what Ubuntu uses if you check the box for "encrypted home directory" when using the desktop installer, so is ...