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Implementation of SSL and TLS protocols
OpenSSL is a software library for applications that provide secure communications over computer networks against eavesdropping, and identify the party
OpenSSL
Security bug in OpenSSL
Heartbleed is a security bug in some outdated versions of the OpenSSL cryptography library, which is a widely used implementation of the Transport Layer
Heartbleed
Set of cryptographic hash functions
"openssl/openssl – kecak1600-avx512vl.pl". GitHub. Retrieved June 25, 2020. "openssl/openssl – keccak1600-avx2.pl". GitHub. November 2021. "openssl/openssl
SHA-3
Cryptographic protocols for securing data in transit
"Firefox 132.0 Release Notes". Mozilla. October 2024. "OpenSSL 3.5 Release Notes". OpenSSL. "The state of the post-quantum Internet". Cloudflare. March
Transport_Layer_Security
Cross-platform instant messaging service
media, instant messaging, VoIP License GNU GPLv2, GNU GPLv3 only with OpenSSL linking exception (clients), proprietary (server) Website telegram.org
Telegram_(software)
Standard for the encryption of electronic data
2014-12-26. Retrieved 2014-06-26. OpenSSL, openssl@openssl.org. "OpenSSL's Notes about FIPS certification". Openssl.org. Archived from the original on
Advanced_Encryption_Standard
TLS extension to serve multiple HTTPS sites
over HTTPS. In April 2026, OpenSSL 4.0 included support for ECH. Since its December 2025 release, nginx supports ECH with OpenSSL 4.0. The initial 2018 version
Server_Name_Indication
General-purpose programming language
Nghttp2 Nrrd Oniguruma OpenCL OpenCV OpenGL OpenGL Utility Library OpenJPEG OpenSSL Pango PCRE PROJ Quartz 2D Raylib Redland RDF S2n-tls Setcontext SFML SDL
C_(programming_language)
International standard
protocol. OpenSSL is open source software that can encrypt, decrypt, sign and verify, compress and uncompress CMS documents, using the openssl-cms command
Cryptographic_Message_Syntax
Implementation of TLS protocols
was removed in release 2.3.0. The OpenBSD project forked LibreSSL from OpenSSL 1.0.1g in April 2014 as a response to the Heartbleed security vulnerability
LibreSSL
Cryptography standard
$ echo '' | openssl s_client -connect example.org:443 -host example.org 2>/dev/null | openssl x509 > example.org.cer 2>/dev/null $ openssl crl2pkcs7 -nocrl
PKCS_7
Message sent to a certificate authority to apply for a certificate
g.: $ # https://www.openssl.org/docs/manmaster/man1/openssl-genrsa.html $ # "openssl genrsa" creates an RSA private key: $ openssl genrsa -out 2024_wikipedia
Certificate_signing_request
Open source web server and a reverse proxy server
in-band health checks TLS/SSL with SNI and OCSP stapling support, via OpenSSL FastCGI, SCGI, uWSGI support with caching gRPC support since March 2018
Nginx
Scripting language created in 1994
"PHP: rfc:preload". wiki.php.net. Retrieved 2019-04-04. "PHP: rfc:improve-openssl-random-pseudo-bytes". wiki.php.net. Retrieved 2019-04-04. "PHP: rfc:weakrefs"
PHP
TLS protocol. Apache-2.0 for OpenSSL 3.0 and later releases. OpenSSL-SSLeay dual-license for any release before OpenSSL 3.0. Several versions of the TLS
Comparison of TLS implementations
Comparison_of_TLS_implementations
Transport layer computer network protocol
Networking Improvements". .NET Blog. 2021-01-11. Retrieved 2021-01-26. "Openssl-quic - OpenSSL Documentation". "What's new in GnuTLS 3.7.0 – Daiki Ueno". 3 December
QUIC
Security bug
were announced in March 2016, along with a patch that disables SSLv2 in OpenSSL; the vulnerability was assigned the ID CVE-2016-0800. The patch alone will
DROWN_attack
Set of cryptographic hash functions
Demystifying Cryptography with OpenSSL 3.0: Discover the Best Techniques to Enhance Your Network Security with OpenSSL 3.0. Birmingham: Packt Publishing
SHA-2
Standard for cryptographic certificates
Support. 16 August 2018. Retrieved 10 September 2020. "openssl/NEWS.md at master · openssl/openssl". GitHub. Retrieved 2025-02-16. B. Kaliski (March 1998)
X.509
Free and open-source Unix-like operating system
The OpenSSL library included in the base system does not enable KTLS support by default, but support can be enabled by building with the WITH_OPENSSL_KTLS
FreeBSD
Free and open source BitTorrent client
open-source BitTorrent client written in native C++. It relies on Boost, OpenSSL, zlib, Qt 6 toolkit and the libtorrent-rasterbar library for the torrent
QBittorrent
Class of attack on cryptographic systems
"DSA-1571-1 openssl -- predictable random number generator". Debian Security Advisory. 13 May 2008. "CVE-2008-0166". CVE. January 9, 2008. OpenSSL 0.9.8c-1
Random number generator attack
Random_number_generator_attack
Archive file format for cryptography objects
p12 or .pfx. These files can be created, parsed and read out with the OpenSSL pkcs12 command. PKCS #12 is the successor to Microsoft's "PFX"; however
PKCS_12
Independent distribution developed entirely by volunteers
to OpenSSL on March 5, 2021. Among the reasons were the problematic process of patching software that was primarily written to work with OpenSSL, the
Void_Linux
Unfixed software vulnerability
that software bugs can have on global cybersecurity. This flaw in the OpenSSL cryptographic library could have been exploited as a zero-day prior to
Zero-day_vulnerability
Free and open-source virtual private network software
every client, using signatures and certificate authority. It uses the OpenSSL encryption library extensively, as well as the TLS protocol, and contains
OpenVPN
Implementation of TLS protocols
by SSL and TLS. wolfSSL also includes an OpenSSL compatibility interface with the most commonly used OpenSSL functions. wolfSSL is currently available
WolfSSL
Format used to deliver movies to cinemas
SHA-1 checksum. It can be calculated with the command: openssl sha1 -binary "FILE_NAME" | openssl base64 A single DCP may be stored in more than one medium
Digital_Cinema_Package
Instructions for the x86 microprocessors
implementations". July 25, 2023. "Improving OpenSSL Performance". May 26, 2015. Retrieved February 28, 2017. "OpenSSL 3.0.0 release notes". GitHub. September
Advanced_Vector_Extensions
Creating sequence of numbers that cannot be predicted
Properties of Pseudo Random Sequences and Experiments with PHP and Debian OpenSSL". Computer Security - ESORICS 2014. Lecture Notes in Computer Science.
Random_number_generation
Practice in cryptography
network that uses common transport layer security protocols, including OpenSSL, when its long-term secret keys are compromised, as with the Heartbleed
Forward_secrecy
Series of free software licenses
The other traditional case of things not being GPL compatible is the OpenSSL project which has a license that does not go well with the GPL. That license
GNU_General_Public_License
Implementation of TLS in Rust
internet security by replacing memory-unsafe software libraries, such as OpenSSL, with memory-safe alternatives. Joe Birr-Pixton started Rustls in 2016
Rustls
Practice and study of secure communication techniques
run in public-private key systems. The C++ opensource encryption library OpenSSL provides free and opensource encryption software and tools. The most commonly
Cryptography
Communications protocol
them to recover (parts of the) plaintext from a DTLS connection using the OpenSSL or GnuTLS implementation of DTLS when Cipher Block Chaining mode encryption
Datagram Transport Layer Security
Datagram_Transport_Layer_Security
Free general-purpose operating system
with hardening flags. In May 2008, a Debian developer discovered that the OpenSSL package distributed with Debian and derivatives such as Ubuntu made a variety
Debian
Cryptographic algorithm for digital signatures
server using OpenSSL that authenticates with Elliptic Curves DSA over a binary field via a timing attack. The vulnerability was fixed in OpenSSL 1.0.0f. In
Elliptic Curve Digital Signature Algorithm
Elliptic_Curve_Digital_Signature_Algorithm
SafeLogic Inc., SUSE LLC and Trend Micro Inc. While OpenSSL is not FIPS 140-2 validated by OpenSSL.org, validations exist for versions from Amazon Web
Comparison of cryptography libraries
Comparison_of_cryptography_libraries
Cryptography secured against quantum computers
implementations. Furthermore, OQS also provides integration of liboqs into OpenSSL. As of March 2023, the following key exchange algorithms are supported:
Post-quantum_cryptography
FTP server software
team Stable release 2.14a (openssl-3.0.12) / December 28, 2023; 2 years ago (2023-12-28) Preview release 2.13 BETA1 (openssl-3.0.7) / November 21, 2022;
Glftpd
List of Android operating system versions
datalist). Miscellaneous improvements and bug fixes. 4.4.4 June 19, 2014 CVE-2014-0224 fixed, eliminating an OpenSSL man-in-the-middle vulnerability.
Android_version_history
Elliptic curve used in Internet cryptography
The name X448 is used for the DH function. X448 support was added to OpenSSL in version 1.1.1 (released on 11 September 2018). Hamburg chose the Solinas
Curve448
U.S. government cryptographic standard
of OpenSSL, with the publication meaning that the OpenSSL derivative was decertified. This decertification hurt companies relying on the OpenSSL-derivative's
FIPS_140-2
Cryptanalytic method for unauthorized users to access data
Ian Goldberg and David Wagner in 1995) and a Debian/Ubuntu edition of OpenSSL discovered in 2008 to be flawed. A similar lack of implemented entropy
Brute-force_attack
Controversial pseudorandom number generator
in BSAFE since 2004. OpenSSL implemented all of NIST SP 800-90A including Dual_EC_DRBG at the request of a client. The OpenSSL developers were aware
Dual_EC_DRBG
Elliptic curve used in Internet cryptography
NaCl GnuTLS mbed TLS (formerly PolarSSL) wolfSSL Botan Schannel Libsodium OpenSSL since version 1.1.0 LibreSSL NSS since version 3.28 Crypto++ curve25519-dalek
Curve25519
Web server software stack
system, created by Romain Bourdon and consisting of the Apache web server, OpenSSL for SSL support, MySQL database and PHP programming language. LAMP: for
WampServer
Algorithm for public-key cryptography
potentially more secure. For efficiency, many popular crypto libraries (such as OpenSSL, Java and .NET) use for decryption and signing the following optimization
RSA_cryptosystem
Digital verification standard
library". www.lysator.liu.se. Retrieved 2025-12-15. "dsa - OpenSSL Documentation". docs.openssl.org. Retrieved 2025-12-15. "wolfSSL User Manual | Chapter
Digital_Signature_Algorithm
Set of computer programs providing encrypted communication sessions
ChaCha20-Poly1305 in 6.5 of January 2014), cutting the dependency on OpenSSL (6.7, October 2014) and an extension to facilitate public-key discovery
OpenSSH
Cryptographic hash function
December 21, 2012. A reference implementation is available under CC0, the OpenSSL License, and the Apache License 2.0. BLAKE2b is faster than MD5, SHA-1
BLAKE_(hash_function)
System that can issue, distribute and verify digital certificates
establish trust between devices and encrypt communications using TLS. OpenSSL is the simplest form of CA and tool for PKI. It is a toolkit, developed
Public_key_infrastructure
wake of Heartbleed, a critical security bug in OpenSSL that is used on millions of websites. OpenSSL is among the first software projects to be funded
Core Infrastructure Initiative
Core_Infrastructure_Initiative
behavior). Provides a Java-based and a simple HTML/JS based WebUI. With OpenSSL exception. No built-in cache-disk cache but a delayed sync. Automatically
Comparison of BitTorrent clients
Comparison_of_BitTorrent_clients
Digital signature scheme
Libgcrypt Minisign and Minisign Miscellanea for macOS NaCl / libsodium OpenSSL 1.1.1 Python - A slow but concise alternate implementation, does not include
EdDSA
Feature of the TLS network security protocol
Network Security Services since version 3.15.5 released in April 2014 OpenSSL since version 1.0.2 released in January 2015 LibreSSL since version 2.1
Application-Layer Protocol Negotiation
Application-Layer_Protocol_Negotiation
Computer operating system
openvpn and KRACK Unsupported: 1.4.2 1 January 2018 4.4.108 OpenVPN 2.4.4 Openssl-1.0.2n (to fix CVE-2017-3735, CVE-2017-3736) Busybox CVE-2017-16544 fix
LibreCMC
Quantum-safe key encapsulation mechanism
implementation based on that. OQS also maintains a quantum-safe Provider module for OpenSSL 3.x, and has integrated its code into BoringSSL. The wolfSSL library additionally
ML-KEM
Free software library implementing TLS
cryptographic functions and provides various utility functions. Unlike OpenSSL and other implementations of TLS, Mbed TLS is like wolfSSL in that it is
Mbed_TLS
General-purpose programming language
platforms Large standard library, including modules for YAML, JSON, XML, CGI, OpenSSL, HTTP, FTP, RSS, curses, zlib and Tk Just-in-time compilation The syntax
Ruby_(programming_language)
Linux kernel interface for cryptography
order for user-mode applications that utilize encryption, such as wolfSSL, OpenSSL or GnuTLS, to take advantage of such acceleration, they must interface
Linux_kernel_crypto_API
Block cipher
Triple Data Encryption Algorithm (TDEA) Block Cipher (SP 800-67 Rev2) OpenSSL does not include 3DES by default since version 1.1.0 (August 2016) and
Triple_DES
Computer networking utility
composite Diffie-Hellman parameter which had been hard-coded into the OpenSSL implementation of socat. The implausibility that a composite might have
Netcat
HTTPS security vulernability
6 (October/November 2011) using OpenSSL 1.0.0+, and since 1.2.2/1.3.2 (June / July 2012) using all versions of OpenSSL. Note that as of December 2013 the
CRIME
Free software TLS/SSL tunneling implementation
including most Unix-like operating systems and Windows. Stunnel relies on the OpenSSL library to implement the underlying TLS or SSL protocol. Stunnel uses public-key
Stunnel
Computer command line program
it with the OpenSSL project's OpenSSL library (or a modified version of that library), containing parts covered by the terms of the OpenSSL or SSLeay licenses
Wget
Security exploit
Software Institute, INRIA and Microsoft Research. The FREAK attack in OpenSSL has the identifier CVE-2015-0204. Vulnerable software and devices included
FREAK
Co-processor optimized for cryptographic operations
Libraries such as OpenSSL and LibreSSL support some such cryptographic accelerators. Almost all Unix-like operating systems use OpenSSL or the fork LibreSSL
Cryptographic_accelerator
version of Pretty Good Privacy GNU Privacy Guard – replacement for PGP OpenSSL – library for applications that provide secure communications over computer
List of free and open-source software packages
List_of_free_and_open-source_software_packages
Authenticated encryption mode for block ciphers
third-generation Intel processors. Appropriate patches were prepared for the OpenSSL and NSS libraries. When both authentication and encryption need to be performed
Galois/Counter_Mode
Computer operating system
session (such as a window or tab) in which the user authenticated the program. LibreSSL replaces OpenSSL 15.6.0 July 18, 2016 OS X v10.11.6 and iOS 9.3.3
Darwin_(operating_system)
Message-digest hashing algorithm
that support MD5: Botan Bouncy Castle cryptlib Crypto++ Libgcrypt Nettle OpenSSL wolfSSL Comparison of cryptographic hash functions Hash function security
MD5
Open-source web server software
Dynamic configuration TLS/SSL with SNI and OCSP stapling support, via OpenSSL or wolfSSL (module mod_ssl) Name- and IP address-based virtual servers
Apache_HTTP_Server
Choosing not to use encryption
the identity function. Examples of this are the "eNULL" cipher suite in OpenSSL, and the "NULL Encryption Algorithm" in IPSec. RFC 2410: "The NULL Encryption
Null_encryption
Augmented password-authenticated key exchange protocol
impacted OpenSSL in particular. SRP-6 Variables A Java library of cryptographic primitives required to implement the SRP-6 protocol. OpenSSL version 1
Secure Remote Password protocol
Secure_Remote_Password_protocol
Inventory of cryptographic assets used in software and systems
"version": "2.3.1" } }, "components": [ { "bom-ref": "lib:openssl@3.0.13", "type": "library", "name": "OpenSSL", "version": "3.0.13" }, { "name": "AES-256-GCM"
Cryptographic bill of materials
Cryptographic_bill_of_materials
Exponentation in modular arithmetic
FileMaker Pro (with 1024-bit RSA encryption example) Ruby's openssl package has the OpenSSL::BN#mod_exp method [6] to perform modular exponentiation. Montgomery
Modular_exponentiation
Cryptographic attack that forces the use of weaker or no encryption
compatibility with older systems. An example of such a flaw was found in OpenSSL that allowed the attacker to negotiate the use of a lower version of TLS
Downgrade_attack
Operating system
LibreSSL, an implementation of the SSL and TLS protocols, forked from OpenSSL 1.0.1g mandoc, a utility used for formatting man pages OpenBGPD, an implementation
OpenBSD
Form of message tampering
and NSS will disable SSL 3.0 by default in April 2015.[needs update] OpenSSL versions 1.0.1j, 1.0.0o and 0.9.8zc, released on October 15, 2014, introduced
POODLE
Instruction set extensions accelerating AES operations
Framework on Solaris 10 onwards FreeBSD's OpenCrypto API (aesni(4) driver) OpenSSL 1.0.1 and above GnuTLS Libsodium VeraCrypt Go programming language BitLocker
AES_instruction_set
Firewall distribution
FreeBSD 13.2 24.1 Savvy Shark 2024-01-30 24.1.10_8 2024-07-25 Suricata 7 OpenSSL 3 ports migration NPTv6 migrate to MVC VXLAN: add support for non standard
OPNsense
Open-source implementation of SSL
unofficially mostly ended, and volunteers forked the project under the OpenSSL banner around December 1998, when Hudson and Young both began working for
SSLeay
Indian software developer
first round of grants, FLOSS/fund made a US$100,000 contribution to the OpenSSL Foundation. Announcing the fund, Nadh said that a significant portion of
Kailash_Nadh
Software engineering agent developed by OpenAI
more than 10,000 high-severity issues in projects including Chromium, OpenSSL, PHP, the self-hosted Git service GOGS, and GnuTLS. The tool validates
OpenAI_Codex_(AI_agent)
Standard to check the revocation status of X.509
article following the repair of the Heartbleed OpenSSL bug. OCSP stapling is widely supported. The OpenSSL project included support in their 0.9.8g release
OCSP_stapling
Authenticated encryption mode for block ciphers
Retrieved 2017-04-20. Caswell, Matt (2017-05-04). "Using TLS1.3 With OpenSSL". OpenSSL blog. Retrieved 2024-10-11. openzfs. "Release zfs-0.8.0 · openzfs/zfs"
CCM_mode
Free software library implementing TLS
OpenSSL already existed, OpenSSL's license is not compatible with the GPL; thus software under the GPL, such as GNU software, could not use OpenSSL without
GnuTLS
Topics referred to by the same term
Heartbleed is a security bug in the open-source OpenSSL cryptography library. Heartbleed may also refer to: "Heartbleed", a song by Tamra Keenan Bleeding
Heartbleed_(disambiguation)
Open-source multi-platform instant messaging client
supported. Some operating systems' ports, such as OpenBSD's, choose to use OpenSSL or LibreSSL by default instead. Contacts with multiple protocols can be
Pidgin_(software)
Early web browser (1993–1997)
recent version (4.2), released in 2007, VMS Mosaic supported HTML 4.0, OpenSSL, cookies, and various image formats including GIF, JPEG, PNG, BMP, TGA
NCSA_Mosaic
Standard in public cryptography
that needs to use smart cards uses PKCS #11, such as Mozilla Firefox and OpenSSL (using an extension). It is also used to access smart cards and HSMs. Software
PKCS_11
Web server solution stack package
MariaDB, PHP and Perl, XAMPP comes with a number of other modules, including OpenSSL, phpMyAdmin, MediaWiki, Joomla, WordPress and more. Self-contained, multiple
XAMPP
Cryptographic hash function
Botan Bouncy Castle cryptlib Crypto++ Libgcrypt Mbed TLS Nettle LibreSSL OpenSSL GnuTLS Hardware acceleration is provided by the following processor extensions:
SHA-1
Book by Brian Kernighan and Dennis Ritchie
Nghttp2 Nrrd Oniguruma OpenCL OpenCV OpenGL OpenGL Utility Library OpenJPEG OpenSSL Pango PCRE PROJ Quartz 2D Raylib Redland RDF S2n-tls Setcontext SFML SDL
The_C_Programming_Language
Data format and compression library
perform the optional compression offered by the Secure Shell protocol. The OpenSSL and GnuTLS security libraries, which can optionally use zlib to compress
Zlib
Protocol to check a digital certificate
Services CA and OCSP responder included with Windows Server cfssl (Go) OpenSSL (C) wolfSSL (C) Certificate revocation list Certificate authority Server-based
Online Certificate Status Protocol
Online_Certificate_Status_Protocol
Authenticated encryption with associated data algorithm
WireGuard, S/MIME 4.0, OTRv4 and multiple other protocols and implemented in OpenSSL and libsodium. Additionally, the algorithm is used in the backup software
ChaCha20-Poly1305
Proprietary email client
OAuth2 and OpenSSL v 1.1.1. On 14 February 2022 a new version 4.80 was released. There were several overall improvements. Some are: OpenSSL was updated
Pegasus_Mail
Internet security protocol
POP/IMAP servers Postfix PowerMTA Exim Prosody Posteo Tutanota mailbox OpenSSL GnuTLS The TLSA RR (Resource Record) for a service is located at a DNS
DNS-based Authentication of Named Entities
DNS-based_Authentication_of_Named_Entities
OPENSSL
OPENSSL
OPENSSL
OPENSSL
Male
Hebrew
(×™Ö°×—Ö´×™×ֵל) Variant spelling of Hebrew Yechiel, YEHIEL means "may God live!"
Male
Gypsy/Romani
 Probably a Romani form of Czech Honza, HANZI means "God is gracious."
Boy/Male
Tamil
Able daughter
Boy/Male
Hindu, Indian
Making Alive
Boy/Male
Hindu
One who bridgesth gap, Friend
Girl/Female
Australian, German, Polish
Small; Humble; Little
Boy/Male
Muslim
Man of honor
Surname or Lastname
English (of Norman origin)
English (of Norman origin) : variant of Duley.
Girl/Female
Hindu
Mother earth
Boy/Male
Hebrew
King.
OPENSSL
OPENSSL
OPENSSL
OPENSSL
OPENSSL