Introduction to Cryptography in .NET

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Export-restricted RSA encryption source code printed on a T-shirt made the T-shirt an export-restricted munition, as a freedom of speech protest against U. The export of cryptographic technology and devices from the United States was severely restricted by U. Since World War II, many governments, including the U. NATO allies, have regulated the export of cryptography for national security reasons, and, as late as 1992, cryptography was on the U. Munitions List as an Auxiliary Military Equipment. Due to the enormous impact of cryptanalysis in World War II, these governments saw the military value in denying current and potential enemies access to cryptographic systems.

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The First Amendment made controlling all use of cryptography inside the U. For law enforcement, framing the issue is simple. In this time of dazzling telecommunications and computer technology where information can have extraordinary value, the ready availability of robust encryption is essential. No one in law enforcement disputes that. Clearly, in today’s world and more so in the future, the ability to encrypt both contemporaneous communications and stored data is a vital component of information security. As is so often the case, however, there is another aspect to the encryption issue that if left unaddressed will have severe public safety and national security ramifications.

For this reason, the law enforcement community is unanimous in calling for a balanced solution to this problem. In the early days of the Cold War, the U. Western technology from falling into the hands of others, particularly the Eastern bloc. All export of technology classed as ‘critical’ required a license.

Department of Commerce, while munitions were controlled by the State Department. By the 1960s, however, financial organizations were beginning to require strong commercial encryption on the rapidly growing field of wired money transfer. Government’s introduction of the Data Encryption Standard in 1975 meant that commercial uses of high quality encryption would become common, and serious problems of export control began to arise. Encryption export controls became a matter of public concern with the introduction of the personal computer. Shortly afterward, Netscape’s SSL technology was widely adopted as a method for protecting credit card transactions using public key cryptography. Legal challenges by Peter Junger and other civil libertarians and privacy advocates, the widespread availability of encryption software outside the U. This section needs to be updated.

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Please update this article to reflect recent events or newly available information. As of 2009, non-military cryptography exports from the U. Department of Commerce’s Bureau of Industry and Security. Title 15 chapter VII, subchapter C. Department of State on the United States Munitions List. Encryption export terminology is defined in EAR part 772. Encryption items include non-military encryption commodities, software, and technology.

Introduction to Cryptography in .NET

Open cryptographic interface is a mechanism which is designed to allow a customer or other party to insert cryptographic functionality without the intervention, help or assistance of the manufacturer or its agents. Export destinations are classified by the EAR Supplement No. D:1 is a short list of countries that are subject to stricter export control. If a line of table that corresponds to the country contains an X in the reason for control column, the export of a controlled item requires a license, unless an exception can be applied. 5A002 Systems, equipment, electronic assemblies, and integrated circuits for “information security.

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5A992 “Mass market” encryption commodities and other equipment not controlled by 5A002. 5B002 Equipment for development or production of items classified as 5A002, 5B002, 5D002 or 5E002. 5D992 Encryption software not controlled by 5D002. 5E002 Technology for the development, production or use of equipment controlled by 5A002 or 5B002 or software controlled by 5D002. 5E992 Technology for the 5×992 items. A BIS review is required for typical items to get the 5A992 or 5D992 classification.

Department of State — International Traffic in Arms Regulations, April 1, 1992, Sec 121. Freeh, Director, Federal Bureau of Investigation before the Senate Judiciary Committee. January 25, 1999 archive of the Netscape Communicator 4. 61 download page showing a more difficult path to download 128-bit version”. Archived from the original on September 16, 1999.

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EPIC copy of document from U. 1 to Part 774 Category 5 Part 2 – Info. Bureau of Industry and Security – Notification Requirements for “Publicly Available” Encryption Source Code”. Participating States Archived 2012-05-27 at Archive.

Bureau of Industry and Security — An overview of the US export regulations can be found in the licensing basics page. Whitfield Diffie and Susan Landau, The Export of Cryptography in the 20th and the 21st Centuries. In Karl de Leeuw, Jan Bergstra, ed. CRS Report for Congress 98-905 F.

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Encryption Technology: Congressional Issues CRS Issue Brief for Congress IB96039. An International Survey of Encryption Policy. National Research Council, Cryptography’s Role in Securing the Information Society. Note: The Standard Names Documentation contains more information about the standard names used in this document. Introduction The Java platform defines a set of APIs spanning major security areas, including cryptography, public key infrastructure, authentication, secure communication, and access control.

These APIs allow developers to easily integrate security mechanisms into their application code. This document describes the technical details of the providers shipped as part of Oracle’s Java Environment. General purpose applications SHOULD NOT request cryptographic services from specific providers. Otherwise, applications are tied to specific providers that may not be available on other Java implementations. Import Limits on Cryptographic Algorithms By default, an application can use cryptographic algorithms of any strength. However, due to import regulations in some locations, you may have to limit the strength of those algorithms.

SunJCE and SunPKCS11 providers use ECB as the default mode and PKCS5Padding as the default padding for many symmetric ciphers. It is recommended to use transformations that fully specify the algorithm, mode, and padding instead of relying on the defaults. Note: ECB works well for single blocks of data and can be parallelized, but absolutely should not be used for multiple blocks of data. The SunPKCS11 provider is available on all platforms, but is only enabled by default on Solaris as it is the only OS with a native PKCS11 implementation automatically installed and configured. On other platforms, applications or deployers must specifically install and configure a native PKCS11 library, and then configure and enable the SunPKCS11 provider to use it. On Solaris, Linux, and OS X, if the entropy gathering device in java. There is currently no NativePRNG on Windows.

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Access to the equivalent functionality is via the SunMSCAPI provider. United States export regulations in effect at the time placed significant restrictions on the type of cryptographic functionality that could be made available internationally in the JDK. For this reason, the SUN provider has historically contained cryptographic engines that did not directly encrypt or decrypt data. Initial seeding is currently done via a combination of system attributes and the java. 3 as an enhanced replacement for the RSA signatures in the SunJSSE provider. Keysize must range between 512 and 65536 bits, the latter of which is unnecessarily large.

Introduction to Cryptography in .NET

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The SunJSSE provider was introduced as part of this release. In earlier JDK releases, there were no RSA signature providers available in the JDK, therefore SunJSSE had to provide its own RSA implementation in order to use commonly available RSA-based certificates. 509 certificate-based key pairs for local side authentication according to the rules defined by the IETF PKIX working group in RFC 3280 or its successor. Footnote 1 – The SSLv3, TLSv1, TLSv1.

2 protocols allow you to send SSLv3, TLSv1, TLSv1. If SSLv3 is absolutely required, the protocol can be reactivated at JRE level by removing “SSLv3” from the jdk. Security property before JSSE is initialized. Cipher Suites SunJSSE supports a large number of cipher suites. The two tables that follow show the cipher suites supported by SunJSSE in preference order and the release in which they were introduced.

The first table lists the cipher suites that are enable by default. The second table shows cipher suites that are supported by SunJSSE but disabled by default. Footnote 1 Cipher suites with SHA384 and SHA256 are available only for TLS 1. Footnote 2 TLS_EMPTY_RENEGOTIATION_INFO_SCSV is a new pseudo-cipher suite to support RFC 5746. Renegotiation Issue section of the JSEE Reference Guide for more information. Footnote 1 RFC 5246 TLS 1.

2 forbids the use of these suites. 1 protocols, but cannot be used in TLS 1. Footnote 2 RFC 4346 TLS 1. 1 forbids the use of these suites. 0 protocols, but cannot be used in TLS 1. Cipher suites that use AES_256 require installation of the JCE Unlimited Strength Jurisdiction Policy Files.

See Import Limits on Cryptographic Algorithms. The provider must implement ECC as defined by the classes and interfaces in the packages java. If one of these algorithms is missing, SunJSSE will not allow EC cipher suites to be used. The provider must support all the SECG curves referenced in RFC 4492 specification, section 5. If these requirements are not met, EC cipher suites may not be negotiated correctly. TLS client did not send the correct version number by default. For compatibility, this behavior is preserved for SSL version 3.

The SunJCE Provider As described briefly in The SUN Provider, US export regulations at the time restricted the type of cryptographic functionality that could be made available in the JDK. The following table lists cipher algorithms available in the SunJCE provider. ECB, CBC, PCBC, CTR, CTS, CFB, CFB8. Keysize must be equal to 128, 192, or 256. Keysize must be equal to 56. Keysize must be equal to 112 or 168. A keysize of 112 will generate a Triple DES key with 2 intermediate keys, and a keysize of 168 will generate a Triple DES key with 3 intermediate keys.