OpenSSL is an open-source implementation of the SSL and TLS protocols.

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OpenSSL vs NSS from FIPS-140-2 and Suite B perspective?

Does anyone know of any work/papers/articles comparing the relative strengths and weaknesses of NSS and OpenSSL? EDIT: In case there aren't any existing documents/articles, I would certainly ...
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1answer
648 views

“Must have” and “Preferred Cipher” suites terminology

I have received the following advise to set cipher suites to suitably mitigate Beast attack on a newly setup Apache HTTPD server. Preferred ciphers: RC4-SHA, RC4-MD5 Must Have Ciphers: ...
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1answer
104 views

FIPS compliant application based on OpenSSL

Let's say I need to write a simple application for signing/checking some data. The hard part is, that it must be FIPS 140-2 compliant. I was thinking to do it using OpenSSL FIPS Object Module 2.0 but ...
3
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1answer
534 views

What could be the order of these ciphers following as first criteria the security and just then the performance?

I need some guide to decide in which order I must put the following ciphers if I want prioritize security and in cases of tied, consider performance to decide. ECDHE-RSA-AES256-GCM-SHA384 TLSv1.2 ...
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3answers
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How force that all connections to my Apache use TLSv1.1 or TLSv1.2?

I tested on Ubuntu 12.04 (apache 2.2.22-1ubuntu1.4 and openssl 1.0.1-4ubuntu5.10) and Ubuntu 13.04 (apache 2.2.22-6ubuntu5.1 and openssl 1.0.1c-4ubuntu8.1). here explain how to do so, but I have the ...
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2answers
256 views

Is cookie information hackable by “Man in middle” Attack over HTTPS?

Just I want to know, is it possible to extract header data by 'Man in middle attack' in HTTPS connection and is there any other way or hack to achieve same thing? If there is way to hack, is it ...
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1answer
93 views

SSL Auth to proxy using Certificate on Client-side

The question may need to be reworded. The server-side is set up with Squid3 acting as an Authenticating proxy by way of LDAP. I did this for testing purposes to make sure everything was working. I ...
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1answer
1k views

OpenVPN dhparam

One of the steps for setting up OpenVPN is running the command openssl dhparam -out dh1024.pem 1024. The man page tells me this 1024 value refers to the number of bits. Why is the value 1024 ...
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How do I get the RSA bit length with the pubkey and openssl?

I have a public key generated with ssh-keygen and I'm just wondering how I get information on the keylength with openssl?
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1answer
263 views

OpenSSL DH modp size

If OpenSSL is configured to use a DH for key exchange, e.g. TLS_DHE_RSA_WITH_AES_128_CBC_SHA, where does it take the size for modp (or even modp itself) from? The following is a screenshot from ...
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1answer
600 views

OpenSSL: Enable cipher suites per protocol version

Is there a way to explicitly configure OpenSSL to allow AES (or in general, block ciphers) only for clients that use a TLS version >= 1.1? This would protect against the BEAST attack, while still ...
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291 views

What do the dots and pluses mean when OpenSSL generates keys?

When OpenSSL generates keys you'll always see a series of periods/dots (.) and pluses (+). openssl dhparam -text -noout -outform PEM -5 2048 ...
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1answer
157 views

Different AES 256 algorithms produce different results?

I've tried 3 AES 256-bit CBC encryption programs, and I seem to be getting different results for each one with the same 32-character password, which consists of all @ signs. They are: Polaris SSL ...
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1answer
226 views

How to authenticate to racoon with a certificate chain if only the root CA is known

I'm trying to setup IPsec using x509 certificates on Linux. I'm using racoon for that task. I've come to the point where the authentication works fine if I keep every link of the certificate chain on ...
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2answers
998 views

OpenSSL PKCS#7 vs. S/MIME

OpenSSL 1.0.1c onwards seems to offer CMS support. I have difficulty understanding the difference between smime and pkcs7. S/MIME specs are layered on PKCS#7 (so says Wikipedia). Now in openssl I ...
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2answers
2k views

Public Key → Certificate?

Is it possible to convert a public key to a certificate using the public key only? I've seen the following, which takes a private key to form a cert request, which can then be self-signed: openssl ...
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1answer
153 views

Are there any risk in serving static assets via compressed SSL protocol from 3rd party domain?

e.g. curl -v -H 'Accept-Encoding: gzip' 'https://cdnjs.cloudflare.com/ajax/libs/Colors.js/1.2.2/colors.min.js' As you can see, result is gzipped. My assumption is since they are serving from 3rd ...
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3answers
648 views

OpenSSL generates 1032bits when I request 1024bits

When I enter the command-line openssl dhparam -text 1024 the resulting safe-prime is 1032 bits instead of 1024 bits. It seems like the 1st byte is always 0. Why is this?
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2answers
162 views

OpenSSL, x509: what is the correct way to picture signing authorities?

For the purposes of creating a VPN, I can't find a logical explanation of OpenSSL's/x509 scheme. I'm royally confused about these three terms, Certificate Authorities Gateway certificates End-point ...
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2answers
2k views

OpenSSL, x509: what's the significance of CN (Common Name)?

With regard to these three items Certificate Authorities (CA) Gateway certificates End-point Certificates (client-cert) What is the significance of the Common Name CN with regard to the a VPN? ...
6
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1answer
471 views

How to get a 'million rounds of PKCS#8 + PBKDF2' with OpenSSL?

I posted this question Is a passphrase-protected SSH private key susceptible to a dictionary attack? a few days back. An excerpt from the final answer: With PKCS#8 + PBKDF2 and one million ...
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1answer
3k views

Getting “SSL: alert [”write“]: fatal : bad record mac” during openssl Handshake

I am getting SSL: alert ["write"]: fatal : bad record mac from the OPENSSL logs during the handshake and Client is not sending the Application data and its creating the handshake again and again. ...
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2answers
1k views

Public keys on OpenSSL vs PGP?

It is my understanding that PGP permits multiple public keys, and in SSL you can only extract one public key? Is this correct? Is there any brief high level run down between the two. I don't feel as ...
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1answer
99 views

Generate CSR with 2 OU Names

I have to create an application which generates a CSR. While generating a CSR we are required to fill in several details like CN, OU, etc. The problem is that the Certifying Authority to which I have ...
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stronger encryption for SSH keys

I configured my server to encrypt user passwords using 500,000 rounds of SHA-512. The question is, how does the standard AES-128-CBC encrypted SSH private key stack up to that, provided the same (or ...
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216 views

OpenSSL dgst authentication failure

I've tried to replicate the workflow presented on this blog in OpenSSL: http://farid.hajji.name/blog/2009/07/27/public-key-cryptography-with-openssl/ However, authentication seems to fail despite ...
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1answer
189 views

Openssl speed block size

I dont really get it what exactly block size in openssl speed output means. Here: How can I interpret openssl speed output? I found the answer that it is the length of the input message. So, should I ...
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5answers
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SSL/TLS - Distinction between self-signed cert and self-signed CA, and other questions?

I have a small personal website which I wish to serve securely over HTTPS. At the moment I do not wish to use a third party CA to sign my certs. I was reading this document on generating a self-signed ...
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2answers
422 views

What to do with expired certificates as a CA?

This and this answer says that "once a certificate has expired, the CA ceases to keep track of its revocation status". I'm trying to learn how OpenSSL works as a CA. If I have a revoked expired ...
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3answers
245 views

Why does OpenSSL need the private key to revoke a certificate?

openssl ca -revoke signed/0A.pem -config caconfig.cnf What does this do which requires the CA's private key? Does it do anything except updating index.txt?
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2answers
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How can I interpret openssl speed output?

I ran openssl speed on my Ubuntu computer. Some results: Doing md4 for 3s on 16 size blocks: 9063888 md4's in 3.00s Doing md4 for 3s on 64 size blocks: 7105157 md4's in 3.00s Doing md4 for 3s on 256 ...
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3answers
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Can someone explain a little better what exactly is accomplished by generation of DH parameters?

I'm setting up a node.js server: https.createServer({ ... ciphers: 'ECDHE-RSA-AES128-SHA256:AES128-GCM-SHA256:RC4:HIGH:!MD5:!aNULL:!EDH', honorCipherOrder: true }, app).listen(443); ...
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1answer
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Why can't a AES256-encrypted file be decrypted on machine other than the one it was encrypted? [closed]

I encrypted a file on my mac using openssl openssl aes-256-cbc -a -salt -in one.jpg -out two.jpg now if I try to decrypt it like that: openssl aes-256-cbc -a -d -salt -in two.jpg -out one.jpg on ...
4
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2answers
836 views

FIPS Compliance for my Android project

I am working on a security-related project and have to make sure it is FIPS 140-2 compliant. According to my understanding, FIPS compliance is compliance at hardware as well as software level. ...
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2answers
442 views

Generating session CSRF token based on SSL session ID

Following situation: Application is only accessible via HTTPS/SPDY nginx is sending the SSL session ID to the upstream server Upon session start I'd like to use the first 128 characters of that ...
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1answer
398 views

Force a subordinate CA cert to be signed to include a the CRL distribution point extension?

How can I attach a crlDistributionPoints parameter when signing a CSR I've generated as follows: openssl req -new -key /root/ca/private/private.key -out /root/public.csr I usually sign with: ...
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1answer
714 views

How to use public key in ~/.ssh for asymmetrical encryption with OpenSSL

I want to do an asymmetrical file encryption: openssl genrsa -des3 -out private.key 4096 openssl rsa -in private.key -pubout -out public.key openssl rsautl -encrypt -pubin -inkey public.key -in a ...
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2answers
1k views

Decrypt from cipher text encrypted using RSA

I am sniffing a client side application traffic and I found some encrypted data. I am not able to decrypt it. Information which I have is Public Key: ...
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2answers
3k views

Decrypting TLS in Wireshark when using DHE_RSA ciphersuites

How can I decrypt TLS messages when an ephemeral Diffie-Hellman ciphersuite is used? I am able to expose the premaster secret and master secret from the SSL Client. Using that, how to decrypt the ...
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2answers
617 views

What is the difference between SSL and X.509 Certificates?

I used openssl to create a X.509 certificate but I don't quite understand the relationship between a X.509 and a SSL certificate. Are they the same? Is a SSL certificate just a X.509 certificate that ...
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1answer
2k views

Different performance of openssl speed on the same hardware with AES 256 (EVP and non EVP API)

If I run openssl 1.0.1e like this : $ ./openssl speed aes-256-cbc (i.e without EVP API) Doing aes-256 cbc for 3s on 16 size blocks: 14388425 aes-256 cbc's in 3.00s Doing aes-256 cbc for 3s on 64 size ...
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1answer
1k views

OpenSSL vs FIPS enabled OpenSSL

A deceptively simple question. How does OpenSSL compare to FIPS enabled OpenSSL? Is it any less secure? How do I tell? If I were concerned about security, not the NIST standard, is there any real ...
2
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1answer
412 views

Is OpenSSL AES GCM standardized?

I have been reading about the perils of not going the pages of my own encrypt-then-mac implementation, because there so many things can go awry. So decided to use EVP_aes_256_gcm. But some questions ...
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2answers
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openssl EVP_aes_256_gcm - what's inside?

I have been reading about encrypting and authentication. Traveled the path from home made authentication to encrypt-then-mac approach and finally settled on GCM mode. I am curious what resided inside ...
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1answer
2k views

SSL Cert Types and Key Usage

I want to use OpenSSL to create a CSR and submit it to my CA (which uses Microsoft PKI) and receive certificates that can be used for both Server Auth and Client Auth. I'm not clear on a couple of ...
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Using SSL on my sites for everything or just some things? [duplicate]

I have a server which provides a few services through the web, some of those services must be logged into to be able to use them. For these services I have implemented SSL using level 3 CACert ...
1
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1answer
230 views

How to open a .txt.enc file?

I have a .txt.enc file. It is an output of openssl enc. I need to open it. When I try to open it in Emacs, the first some characters(also known characters) are : 'Salted__C' . how can I understand ...
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3answers
1k views

Could I delete .csr files when the key is signed by CA

I'm creating my own openvpn server. The Certificat authority is located on a separated host. There is two kind of clients: which that just send a .csr and to which i send the .crt as an answer and ...
6
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3answers
10k views

Converting keys between openssl and openssh

If I use the following openssl req -x509 -days 365 -newkey rsa:2048 -keyout private.pem -out public.pem -nodes I get private.pem and public.pem If I use ssh-keygen -t rsa -f rsa I get rsa and ...
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2answers
387 views

how to specify only the named curve in CSR request?

I am trying to send a CSR to a server and it is successfully signed when generated from the command line but fails with a (0 length ASN.1) error when generated programatically. I suspect, perhaps, its ...