Why BitLocker does not use RSA Announcing the arrival of Valued Associate #679: Cesar Manara Planned maintenance scheduled April 23, 2019 at 23:30 UTC (7:30pm US/Eastern)Securely read encryption key from NVRAM of TPM 1.2Methods of cold boot attacks in the wildClarification of RSA Key Exchange (TLS 1.2) and AES for On-Going Message ExcahngeShould I really salt in a RSA/AES hybrid connection?Anniversary Update with Bitlocker Reboot without Encryption KeyIs it possible to extract secrets from a TPM without knowing the PIN?Security of TPM 1.2 for providing tamper-evidence against firmware modificationHow does full memory encryption in newer processes protect against DMA attacks?How does Bitlocker + TPM prevent me seeing the HDD contents with another OS?Is GPG's AES encryption that much stronger than its RSA headers?
Tannaka duality for semisimple groups
Does silver oxide react with hydrogen sulfide?
After Sam didn't return home in the end, were he and Al still friends?
How to ask rejected full-time candidates to apply to teach individual courses?
White walkers, cemeteries and wights
Why is std::move not [[nodiscard]] in C++20?
Moving a wrapfig vertically to encroach partially on a subsection title
Is there any word for a place full of confusion?
Is multiple magic items in one inherently imbalanced?
GDP with Intermediate Production
What does the writing on Poe's helmet say?
Mounting TV on a weird wall that has some material between the drywall and stud
How to change the tick of the color bar legend to black
Nose gear failure in single prop aircraft: belly landing or nose-gear up landing?
What does Turing mean by this statement?
Special flights
Co-worker has annoying ringtone
One-one communication
Tips to organize LaTeX presentations for a semester
What adaptations would allow standard fantasy dwarves to survive in the desert?
Can two people see the same photon?
What order were files/directories output in dir?
Found this skink in my tomato plant bucket. Is he trapped? Or could he leave if he wanted?
Why weren't discrete x86 CPUs ever used in game hardware?
Why BitLocker does not use RSA
Announcing the arrival of Valued Associate #679: Cesar Manara
Planned maintenance scheduled April 23, 2019 at 23:30 UTC (7:30pm US/Eastern)Securely read encryption key from NVRAM of TPM 1.2Methods of cold boot attacks in the wildClarification of RSA Key Exchange (TLS 1.2) and AES for On-Going Message ExcahngeShould I really salt in a RSA/AES hybrid connection?Anniversary Update with Bitlocker Reboot without Encryption KeyIs it possible to extract secrets from a TPM without knowing the PIN?Security of TPM 1.2 for providing tamper-evidence against firmware modificationHow does full memory encryption in newer processes protect against DMA attacks?How does Bitlocker + TPM prevent me seeing the HDD contents with another OS?Is GPG's AES encryption that much stronger than its RSA headers?
.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;
If I do not understand wrong from this post and Wikipedia page of the BitLocker and TPM, by default, BitLocker uses symmetric cryptography like AES. However, TPM is capable of performing RSA encryption.
Given that, the RSA key is stored in the TPM, why BitLocker does not use the asymmetric encryption (i.e., RSA)? By using such encryption technique, we might be able to defend against the cold boot attack or sniffing on LPC bus.
aes rsa tpm bitlocker cold-boot-attack
New contributor
add a comment |
If I do not understand wrong from this post and Wikipedia page of the BitLocker and TPM, by default, BitLocker uses symmetric cryptography like AES. However, TPM is capable of performing RSA encryption.
Given that, the RSA key is stored in the TPM, why BitLocker does not use the asymmetric encryption (i.e., RSA)? By using such encryption technique, we might be able to defend against the cold boot attack or sniffing on LPC bus.
aes rsa tpm bitlocker cold-boot-attack
New contributor
add a comment |
If I do not understand wrong from this post and Wikipedia page of the BitLocker and TPM, by default, BitLocker uses symmetric cryptography like AES. However, TPM is capable of performing RSA encryption.
Given that, the RSA key is stored in the TPM, why BitLocker does not use the asymmetric encryption (i.e., RSA)? By using such encryption technique, we might be able to defend against the cold boot attack or sniffing on LPC bus.
aes rsa tpm bitlocker cold-boot-attack
New contributor
If I do not understand wrong from this post and Wikipedia page of the BitLocker and TPM, by default, BitLocker uses symmetric cryptography like AES. However, TPM is capable of performing RSA encryption.
Given that, the RSA key is stored in the TPM, why BitLocker does not use the asymmetric encryption (i.e., RSA)? By using such encryption technique, we might be able to defend against the cold boot attack or sniffing on LPC bus.
aes rsa tpm bitlocker cold-boot-attack
aes rsa tpm bitlocker cold-boot-attack
New contributor
New contributor
New contributor
asked 3 hours ago
user3862410user3862410
61
61
New contributor
New contributor
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
Asymmetric encryption like RSA is limited in that you can only use it to encrypt data the size of the key. With a 2048 bit key, you can only encrypt 2048 bits of information. For this reason RSA is unsuitable for bulk encryption like disks - and even for small files like email messages.
This is why almost all uses of asymmetric encryption involve "hybrid encryption". RSA is used to encrypt the key for a symmetric algorithm like AES, and AES is used to encrypt the bulk data. PGP is an example of a hybrid encryption application.
add a comment |
Your Answer
StackExchange.ready(function()
var channelOptions =
tags: "".split(" "),
id: "162"
;
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function()
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled)
StackExchange.using("snippets", function()
createEditor();
);
else
createEditor();
);
function createEditor()
StackExchange.prepareEditor(
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: false,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: null,
bindNavPrevention: true,
postfix: "",
imageUploader:
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
,
noCode: true, onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
);
);
user3862410 is a new contributor. Be nice, and check out our Code of Conduct.
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
var $window = $(window),
onScroll = function(e)
var $elem = $('.new-login-left'),
docViewTop = $window.scrollTop(),
docViewBottom = docViewTop + $window.height(),
elemTop = $elem.offset().top,
elemBottom = elemTop + $elem.height();
if ((docViewTop elemBottom))
StackExchange.using('gps', function() StackExchange.gps.track('embedded_signup_form.view', location: 'question_page' ); );
$window.unbind('scroll', onScroll);
;
$window.on('scroll', onScroll);
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fsecurity.stackexchange.com%2fquestions%2f207771%2fwhy-bitlocker-does-not-use-rsa%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
Asymmetric encryption like RSA is limited in that you can only use it to encrypt data the size of the key. With a 2048 bit key, you can only encrypt 2048 bits of information. For this reason RSA is unsuitable for bulk encryption like disks - and even for small files like email messages.
This is why almost all uses of asymmetric encryption involve "hybrid encryption". RSA is used to encrypt the key for a symmetric algorithm like AES, and AES is used to encrypt the bulk data. PGP is an example of a hybrid encryption application.
add a comment |
Asymmetric encryption like RSA is limited in that you can only use it to encrypt data the size of the key. With a 2048 bit key, you can only encrypt 2048 bits of information. For this reason RSA is unsuitable for bulk encryption like disks - and even for small files like email messages.
This is why almost all uses of asymmetric encryption involve "hybrid encryption". RSA is used to encrypt the key for a symmetric algorithm like AES, and AES is used to encrypt the bulk data. PGP is an example of a hybrid encryption application.
add a comment |
Asymmetric encryption like RSA is limited in that you can only use it to encrypt data the size of the key. With a 2048 bit key, you can only encrypt 2048 bits of information. For this reason RSA is unsuitable for bulk encryption like disks - and even for small files like email messages.
This is why almost all uses of asymmetric encryption involve "hybrid encryption". RSA is used to encrypt the key for a symmetric algorithm like AES, and AES is used to encrypt the bulk data. PGP is an example of a hybrid encryption application.
Asymmetric encryption like RSA is limited in that you can only use it to encrypt data the size of the key. With a 2048 bit key, you can only encrypt 2048 bits of information. For this reason RSA is unsuitable for bulk encryption like disks - and even for small files like email messages.
This is why almost all uses of asymmetric encryption involve "hybrid encryption". RSA is used to encrypt the key for a symmetric algorithm like AES, and AES is used to encrypt the bulk data. PGP is an example of a hybrid encryption application.
answered 2 hours ago
gowenfawrgowenfawr
54.9k11115162
54.9k11115162
add a comment |
add a comment |
user3862410 is a new contributor. Be nice, and check out our Code of Conduct.
user3862410 is a new contributor. Be nice, and check out our Code of Conduct.
user3862410 is a new contributor. Be nice, and check out our Code of Conduct.
user3862410 is a new contributor. Be nice, and check out our Code of Conduct.
Thanks for contributing an answer to Information Security Stack Exchange!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
var $window = $(window),
onScroll = function(e)
var $elem = $('.new-login-left'),
docViewTop = $window.scrollTop(),
docViewBottom = docViewTop + $window.height(),
elemTop = $elem.offset().top,
elemBottom = elemTop + $elem.height();
if ((docViewTop elemBottom))
StackExchange.using('gps', function() StackExchange.gps.track('embedded_signup_form.view', location: 'question_page' ); );
$window.unbind('scroll', onScroll);
;
$window.on('scroll', onScroll);
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fsecurity.stackexchange.com%2fquestions%2f207771%2fwhy-bitlocker-does-not-use-rsa%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
var $window = $(window),
onScroll = function(e)
var $elem = $('.new-login-left'),
docViewTop = $window.scrollTop(),
docViewBottom = docViewTop + $window.height(),
elemTop = $elem.offset().top,
elemBottom = elemTop + $elem.height();
if ((docViewTop elemBottom))
StackExchange.using('gps', function() StackExchange.gps.track('embedded_signup_form.view', location: 'question_page' ); );
$window.unbind('scroll', onScroll);
;
$window.on('scroll', onScroll);
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
var $window = $(window),
onScroll = function(e)
var $elem = $('.new-login-left'),
docViewTop = $window.scrollTop(),
docViewBottom = docViewTop + $window.height(),
elemTop = $elem.offset().top,
elemBottom = elemTop + $elem.height();
if ((docViewTop elemBottom))
StackExchange.using('gps', function() StackExchange.gps.track('embedded_signup_form.view', location: 'question_page' ); );
$window.unbind('scroll', onScroll);
;
$window.on('scroll', onScroll);
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
var $window = $(window),
onScroll = function(e)
var $elem = $('.new-login-left'),
docViewTop = $window.scrollTop(),
docViewBottom = docViewTop + $window.height(),
elemTop = $elem.offset().top,
elemBottom = elemTop + $elem.height();
if ((docViewTop elemBottom))
StackExchange.using('gps', function() StackExchange.gps.track('embedded_signup_form.view', location: 'question_page' ); );
$window.unbind('scroll', onScroll);
;
$window.on('scroll', onScroll);
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown