Key generation is the process of generating keys for cryptography. A key is used to encrypt and decrypt whatever data is being encrypted/decrypted.

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OpenSSL key derivation

I'm trying to manually decrypt DTLS packets sent by OpenSSL. The cipher suite used between the server and the client is TLS_RSA_WITH_AES_256_CBC_SHA256 and my understanding is that the IV used by ...
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Is it true that key authentications are considered insecure nowaday?

Some of the comments on this post here: http://superuser.com/q/1034137/479461 are claiming this. i.e. this one says (emphasis mine) You got brute forced. This is why one does not leave a ssh ...
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What does key signing mean?

What exactly does the "key signing" mean? So for example I have a private/public GPG key so that people could send me encrypted e-mail, because they know my public key. But: what does key signing ...
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pseudo-random key generation

If you set up a pseudo-random number generator in two different locations, but with the same seed, and you assume that they are both on the same number of ticks from startup, will they output the same ...
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Is it possible to convert Key BLOB to any other format using CAPI [migrated]

We use Key Blobs to export keys in public key cryptography. Is there any other format to export key pair using crypto API's. So that the exported key storage type is compatible with other operating ...
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How to counter the security risks of shared prime factors among RSA moduli employed in practice?

A. K. Lenstra et al. in an extensive examination of the RSA moduli employed in practice (http://infoscience.epfl.ch/record/174943/files/eprint.pdf, p.10) wrote that they "could not explain the ...
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How can I create a secure random key for AES?

I need to generate a lot of shared keys for an AES method which uses in various condition, my concern is how can I generate unpredictable keys? I've had some research on Cryptographically secure ...
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54 views

Why is the Key Derivation Function important?

Let's consider this openssl command : openssl enc -aes-256-cbc -pass pass:PASSWORD Why is it important to have a good Key Derivation Function? This answer to another question suggest that GnuPG is ...
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107 views

OBKG on smartcard with PKCS#11

I have a new smart card with an on board PKCS#11 module and operate in a Win 8 environment. Like many cards, it can generate its own key pairs for enhanced security (only the public key can leave ...
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306 views

Are WoSign S/MIME certificates generated on the server side and therefore unsafe to use?

WoSign has been in the media for offering free server and client certificates. Since one of my (free) S/MIME certificate from another CA is about to expire soon after one year and WoSign offers ...
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Safe to Encrypt ClientId (Integer value) to use as Client Key?

Asked a follow up question (see this link). Based on my understanding, I have to issue an unique ClientId and Client Secret Key to the API subscribers right after the registration phase (client lives ...
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SSH key-type, rsa, dsa, ecdsa, are there easy answers for which to choose when?

As someone who knows little about cryptography, I wonder about the choice I make when creating ssh-keys. ssh-keygen -t type, where type is either of dsa,rsa and ecdsa. Googling can give some ...
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84 views

Is this a safe way to verify public keys?

I want to verify a public key like this: Alice generates a public/private key pair for encryption Alice generates a public/private key pair for signing Alice signs a random 4-letter word + the ...
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1answer
21 views

Transparent key management for client computers

I'm tasked with adding a backup feature to our software. This backup feature should store the customer's database on external memory. One of the requirements for this feature is that the backup should ...
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20 views

Using 8192 bit keys GPG [duplicate]

I am interested in generating 8192 bit keys out of curiosity. I know that 4096 bit keys is the maximum key strength that is recommended, but I would like to know how to increase the size. I have ...
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1answer
36 views

OpenSSL ecparam generates same private key every time?

Currently I am trying to make my web server as secure as possible and I am testing different cipher suites on the server side, some of them using ECDHE key exchange. When generating private EC keys, ...
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1answer
24 views

One Input Two Hashes

Suppose I have some password x, and two different hash functions h1 and h2. I can then compute the hash y1 = h1(x) and y2 = h2(x). Is there any sort of vulnerability in this case? More ...
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Find private key from private certificate

I have a private certificate from my email server in order to sign emails. At Section "Your S/MIME Personal Certificate" I can view my: private certificate public certificate My public certificate ...
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Alternatives to HTML's deprecated <keygen> for client certs?

The keygen tag is used to make browsers generate private keys and POST the resulting CSR to the server, which can then issue a certificate. It's now been deprecated, for rather stupid reasons but ...
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How much entropy should passphrases for encrypting ssh keys have?

When one generates keys using ssh-keygen one gets prompted for a passphrase to encrypt the generated key with. How strong should such a passphrase be, entropywise, to withstand a full-blown ...
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How many bits of security is in a n-bit modulus?

In a paper that I read, "A riddle wrapped in an enigma" by N. Koblitz and A.J. Menezes, there are several statements like this one(at page 4, section 2.3): ..., the NSA updated to Suite B [40] so ...
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3answers
131 views

How to store encryption key securely?

Say I have symmetric key which I want to store securely. One way is I will store this key on file system encrypted using user password. Then user at windows startup will enter password which will be ...
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National ID analysis and generator?

A National ID in my country consists of 14 digits: CYYMMDDXXZZZZ1C1 Where: C refers to the century - 2 for those born between 1900 and 1999, 3 for those born between 2000 to 2099 YYMMDD - ...
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71 views

Using the password, among other values, as key data in two-factor authentication

I'm writing an implementation and a thesis about two-factor authentication, and am currently doing some research. I'm currently looking at an implementation for deterministically generating a ...
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111 views

What is the openssl equivalent of using java's KeyPairGenerator?

I have been using java's KeyPairGenerator in order to generate public/private keys within a program so that I can encrypt and decrypt files(also using java encrypt/decrypt methods). I want to be able ...
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1answer
80 views

LibTomCrypt weird ECC Keys

I recently started working with the LibTomCrypt Library because it claimed to be a well documented C Library to get started with Elliptic Curve Cryptography. In my first little program I created an ...
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Why is openssl key length different from specified bytes

I realize this is rudimentary question, but I can't seem to even google diagnose it. Why is openssl key length different from specified bytes? For example when I use the command: openssl genrsa -out ...
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129 views

Do you need more then 128bit entropy

UUID use 128 bit numbers. Currently it is not feasible to randomly produce two UUIDs that are the same. Does that means 128 bits of entropy is suitable for all cryptographic operations? I would ...
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1answer
25 views

Publish an image to github with rsa keypairs, what are the security risks? (NOT PRODUCTION)

I have Dockerfile for an image that I would like to publish to docker hub so it can be easily available to users without building the image themselves. The whole thing is meant for labbing and ...
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43 views

How does STK (Short Term Key) generation work in a Bluetooth Low Energy?

I want to understand how STK (Short Term Key) generation works in a Bluetooth Low Energy. I don't want to go deep at a packets exchange level of a Security Manager Protocol, but I want to understand ...
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1answer
70 views

Should I revoke & regenerate PGP private keys after computer is serviced by Apple Store?

I recently had an issue with my MacBook where it wouldn't boot. So I took it in to the apple store, and they said that they would need to send it off to a service center to diagnose and repair it. I ...
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Key stretching approaches

I've seen that a number of key stretching algorithms and they involved increasing the number of operations needed to compute the key(i.e. the number of rounds within a hash function). But, I wonder if ...
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Using plain-text phrases as public/private pair?

I'm working on an application that'll be used by relatively non tech-savvy users, and while the machines will have internet access, the app can't have any sort of hosted intermediary. The app allows ...
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MPPE-Send and Receive key derivation from MS-CHAPv2

I am trying to get the MS-MPPE-Send-key and MS-MPPE-Recv-key from the MS-CHAPv2 challenge material. I am able to follow the RFCs 2548 3078 and 3079 to the step of getting the GetNewKeyFromSHA() it is ...
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Can i know how chosen ciphertext attack work on textbook RSA

I am very new to cryptography and I am confused with something? Here is the homework question I am having trouble with: Write a program to attack the Textbook RSA Encryption Scheme, in order to ...
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1answer
48 views

How to verify a password/key on subsequent key derivations

The first time a user logs in to our app, we derive an AES key from their password using PBKDF2. The AES key is kept in RAM only and used to encrypt and wrap other keys and data during the session. ...
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58 views

New certificate but what about the keys?

One of our SSL certificates has expired and along with that so has the keys. I have a re-newed certificate but no re-newed keys. The posting Should I change the private key when renewing a ...
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keytool -genseckey -alias TDES -keyalg DESede -keysize 128 works within jre/bin folder but not when the keytool.exe is on another location

I would like to create a TDES key with size 128bits and 2KTDES key with 192bits for authentication in a Desfire smart card. Hence I have used the keytool to generate the jceks with the following ...
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What is the DUKPT Key Derivation Function?

I'm tasked with decrypting ciphertext acquired from an encrypted card reader. The card reader utilizes DUKPT(derived unique key per transaction) scheme and 3DES encryption. I don't have a problem with ...
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80 views

Safenet iKey 4000 RSA key pair generation in FIPS 140-2 compliant mode

I need to generate RSA key pair and show the public and private key on screen (in a secured room). The algorithm must be FIPS approved. So I would like to use iKey 4000 which is FIPS 140-2 level 3 ...
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1k views

Using HMAC to generate secret keys

I am developing a platform that uses several secret keys for several usages: key1 for hashing passwords (using pbkdf2-hmac-sha256), key2 to generate non-repeating unpredictable uuids (using aes-128 ...
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Javascript web-based key derivation [closed]

Is there a website with a key derivation function running entirely in client-side Javascript? The string which is used to generate the key cannot be seen outside the client. It shouldn't use a ...
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Guessing the whole PBDKF2 output from 1 half

If I use PBDKF2 with a good enough password and salt to generate a 2n bytes key, does knowing the first or last n bytes make it any easier for a 3rd party to guess the other half of my key than using ...
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How bad an idea is intentionally using short RSA keys for signing CloudFront private-content URLs?

While pondering a question on SO about efficiently generating signed private-content URLs for CloudFront I decided to check what sorts of savings could be found by using a shorter RSA key. With the ...
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How to properly transition from standard PGP keys to using subkeys?

When I initially set up PGP, PGPTools didn't prompt me to create separate subkeys, as explained in the article "Creating the Perfect PGP Keypair". Now that I've learned a bit more about PGP, I'd like ...
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Is there a cryptosystem that allows a set of auditors to confirm that they have valid Shamir or Group signatures?

Suppose I have a client that generates and sends a Shamir key (or group signature) to a set of Auditors. This key is essentially an unverified set of bytes. Each auditor wants to somehow verify that ...
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254 views

Create Public Key using OpenSSL instead of PuTTYgen for PKCS#8

I'm trying to create a public key pair for ssh-rsa authentication. If I'm using puttygen.exe, the "OpenSSH authorized_keys file" string looks like this: "ssh-rsa AAAAB3 ... 6yIK9Nbw== ...
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639 views

Which default encryption does OpenSSL use?

If I create a private key via: openssl req -x509 -newkey rsa:2048 -out cert.crt then OpenSSL writes the private key to the file privkey.pem and if you do not provide the -nodes parameter it will ...
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output from CryptGenRandom [closed]

Can we capture the output of Windows CryptGenRandom function. Suppose an application is utilizing CryptGenRandom, as a user can we know what is the Random Number generated and given to the ...
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Security without TLS certificates

after getting an answer to Security over multi-streaming such as SCTP i have found that i do not have the capacity to give a public key or certificate to the other end securely (to be sure MitM cannot ...