jdk/src/share/lib/security/java.security-linux

#
# This is the "master security properties file".
#
# An alternate java.security properties file may be specified
# from the command line via the system property
#
#    -Djava.security.properties=<URL>
#
# This properties file appends to the master security properties file.
# If both properties files specify values for the same key, the value
# from the command-line properties file is selected, as it is the last
# one loaded.
#
# Also, if you specify
#
#    -Djava.security.properties==<URL> (2 equals),
#
# then that properties file completely overrides the master security
# properties file.
#
# To disable the ability to specify an additional properties file from
# the command line, set the key security.overridePropertiesFile
# to false in the master security properties file. It is set to true
# by default.

# In this file, various security properties are set for use by
# java.security classes. This is where users can statically register
# Cryptography Package Providers ("providers" for short). The term
# "provider" refers to a package or set of packages that supply a
# concrete implementation of a subset of the cryptography aspects of
# the Java Security API. A provider may, for example, implement one or
# more digital signature algorithms or message digest algorithms.
#
# Each provider must implement a subclass of the Provider class.
# To register a provider in this master security properties file,
# specify the Provider subclass name and priority in the format
#
#    security.provider.<n>=<className>
#
# This declares a provider, and specifies its preference
# order n. The preference order is the order in which providers are
# searched for requested algorithms (when no specific provider is
# requested). The order is 1-based; 1 is the most preferred, followed
# by 2, and so on.
#
# <className> must specify the subclass of the Provider class whose
# constructor sets the values of various properties that are required
# for the Java Security API to look up the algorithms or other
# facilities implemented by the provider.
#
# There must be at least one provider specification in java.security.
# There is a default provider that comes standard with the JDK. It
# is called the "SUN" provider, and its Provider subclass
# named Sun appears in the sun.security.provider package. Thus, the
# "SUN" provider is registered via the following:
#
#    security.provider.1=sun.security.provider.Sun
#
# (The number 1 is used for the default provider.)
#
# Note: Providers can be dynamically registered instead by calls to
# either the addProvider or insertProviderAt method in the Security
# class.

#
# List of providers and their preference orders (see above):
#
security.provider.1=sun.security.provider.Sun
security.provider.2=sun.security.rsa.SunRsaSign
security.provider.3=sun.security.ec.SunEC
security.provider.4=com.sun.net.ssl.internal.ssl.Provider
security.provider.5=com.sun.crypto.provider.SunJCE
security.provider.6=sun.security.jgss.SunProvider
security.provider.7=com.sun.security.sasl.Provider
security.provider.8=org.jcp.xml.dsig.internal.dom.XMLDSigRI
security.provider.9=sun.security.smartcardio.SunPCSC

#
# Sun Provider SecureRandom seed source.
#
# Select the primary source of seed data for the "SHA1PRNG" and
# "NativePRNG" SecureRandom implementations in the "Sun" provider.
# (Other SecureRandom implementations might also use this property.)
#
# On Unix-like systems (for example, Solaris/Linux/MacOS), the
# "NativePRNG" and "SHA1PRNG" implementations obtains seed data from
# special device files such as file:/dev/random.
#
# On Windows systems, specifying the URLs "file:/dev/random" or
# "file:/dev/urandom" will enable the native Microsoft CryptoAPI seeding
# mechanism for SHA1PRNG.
#
# By default, an attempt is made to use the entropy gathering device
# specified by the "securerandom.source" Security property.  If an
# exception occurs while accessing the specified URL:
#
#     SHA1PRNG:
#         the traditional system/thread activity algorithm will be used.
#
#     NativePRNG:
#         a default value of /dev/random will be used.  If neither
#         are available, the implementation will be disabled.
#         "file" is the only currently supported protocol type.
#
# The entropy gathering device can also be specified with the System
# property "java.security.egd". For example:
#
#   % java -Djava.security.egd=file:/dev/random MainClass
#
# Specifying this System property will override the
# "securerandom.source" Security property.
#
# In addition, if "file:/dev/random" or "file:/dev/urandom" is
# specified, the "NativePRNG" implementation will be more preferred than
# SHA1PRNG in the Sun provider.
#
securerandom.source=file:/dev/random

#
# A list of known strong SecureRandom implementations.
#
# To help guide applications in selecting a suitable strong
# java.security.SecureRandom implementation, Java distributions should
# indicate a list of known strong implementations using the property.
#
# This is a comma-separated list of algorithm and/or algorithm:provider
# entries.
#
securerandom.strongAlgorithms=NativePRNGBlocking:SUN

#
# Class to instantiate as the javax.security.auth.login.Configuration
# provider.
#
login.configuration.provider=sun.security.provider.ConfigFile

#
# Default login configuration file
#
#login.config.url.1=file:${user.home}/.java.login.config

#
# Class to instantiate as the system Policy. This is the name of the class
# that will be used as the Policy object.
#
policy.provider=sun.security.provider.PolicyFile

# The default is to have a single system-wide policy file,
# and a policy file in the user's home directory.
policy.url.1=file:${java.home}/lib/security/java.policy
policy.url.2=file:${user.home}/.java.policy

# whether or not we expand properties in the policy file
# if this is set to false, properties (${...}) will not be expanded in policy
# files.
policy.expandProperties=true

# whether or not we allow an extra policy to be passed on the command line
# with -Djava.security.policy=somefile. Comment out this line to disable
# this feature.
policy.allowSystemProperty=true

# whether or not we look into the IdentityScope for trusted Identities
# when encountering a 1.1 signed JAR file. If the identity is found
# and is trusted, we grant it AllPermission.
policy.ignoreIdentityScope=false

#
# Default keystore type.
#
keystore.type=jks

#
# Controls compatibility mode for the JKS keystore type.
#
# When set to 'true', the JKS keystore type supports loading
# keystore files in either JKS or PKCS12 format. When set to 'false'
# it supports loading only JKS keystore files.
#
keystore.type.compat=true

#
# List of comma-separated packages that start with or equal this string
# will cause a security exception to be thrown when
# passed to checkPackageAccess unless the
# corresponding RuntimePermission ("accessClassInPackage."+package) has
# been granted.
package.access=sun.,\
               com.sun.xml.internal.,\
               com.sun.imageio.,\
               com.sun.istack.internal.,\
               com.sun.jmx.,\
               com.sun.media.sound.,\
               com.sun.naming.internal.,\
               com.sun.proxy.,\
               com.sun.corba.se.,\
               com.sun.org.apache.bcel.internal.,\
               com.sun.org.apache.regexp.internal.,\
               com.sun.org.apache.xerces.internal.,\
               com.sun.org.apache.xpath.internal.,\
               com.sun.org.apache.xalan.internal.extensions.,\
               com.sun.org.apache.xalan.internal.lib.,\
               com.sun.org.apache.xalan.internal.res.,\
               com.sun.org.apache.xalan.internal.templates.,\
               com.sun.org.apache.xalan.internal.utils.,\
               com.sun.org.apache.xalan.internal.xslt.,\
               com.sun.org.apache.xalan.internal.xsltc.cmdline.,\
               com.sun.org.apache.xalan.internal.xsltc.compiler.,\
               com.sun.org.apache.xalan.internal.xsltc.trax.,\
               com.sun.org.apache.xalan.internal.xsltc.util.,\
               com.sun.org.apache.xml.internal.res.,\
               com.sun.org.apache.xml.internal.security.,\
               com.sun.org.apache.xml.internal.serializer.utils.,\
               com.sun.org.apache.xml.internal.utils.,\
               com.sun.org.glassfish.,\
               com.oracle.xmlns.internal.,\
               com.oracle.webservices.internal.,\
               oracle.jrockit.jfr.,\
               org.jcp.xml.dsig.internal.,\
               jdk.internal.,\
               jdk.nashorn.internal.,\
               jdk.nashorn.tools.,\
               com.sun.activation.registries.

#
# List of comma-separated packages that start with or equal this string
# will cause a security exception to be thrown when
# passed to checkPackageDefinition unless the
# corresponding RuntimePermission ("defineClassInPackage."+package) has
# been granted.
#
# by default, none of the class loaders supplied with the JDK call
# checkPackageDefinition.
#
package.definition=sun.,\
                   com.sun.xml.internal.,\
                   com.sun.imageio.,\
                   com.sun.istack.internal.,\
                   com.sun.jmx.,\
                   com.sun.media.sound.,\
                   com.sun.naming.internal.,\
                   com.sun.proxy.,\
                   com.sun.corba.se.,\
                   com.sun.org.apache.bcel.internal.,\
                   com.sun.org.apache.regexp.internal.,\
                   com.sun.org.apache.xerces.internal.,\
                   com.sun.org.apache.xpath.internal.,\
                   com.sun.org.apache.xalan.internal.extensions.,\
                   com.sun.org.apache.xalan.internal.lib.,\
                   com.sun.org.apache.xalan.internal.res.,\
                   com.sun.org.apache.xalan.internal.templates.,\
                   com.sun.org.apache.xalan.internal.utils.,\
                   com.sun.org.apache.xalan.internal.xslt.,\
                   com.sun.org.apache.xalan.internal.xsltc.cmdline.,\
                   com.sun.org.apache.xalan.internal.xsltc.compiler.,\
                   com.sun.org.apache.xalan.internal.xsltc.trax.,\
                   com.sun.org.apache.xalan.internal.xsltc.util.,\
                   com.sun.org.apache.xml.internal.res.,\
                   com.sun.org.apache.xml.internal.security.,\
                   com.sun.org.apache.xml.internal.serializer.utils.,\
                   com.sun.org.apache.xml.internal.utils.,\
                   com.sun.org.glassfish.,\
                   com.oracle.xmlns.internal.,\
                   com.oracle.webservices.internal.,\
                   oracle.jrockit.jfr.,\
                   org.jcp.xml.dsig.internal.,\
                   jdk.internal.,\
                   jdk.nashorn.internal.,\
                   jdk.nashorn.tools.,\
                   com.sun.activation.registries.

#
# Determines whether this properties file can be appended to
# or overridden on the command line via -Djava.security.properties
#
security.overridePropertiesFile=true

#
# Determines the default key and trust manager factory algorithms for
# the javax.net.ssl package.
#
ssl.KeyManagerFactory.algorithm=SunX509
ssl.TrustManagerFactory.algorithm=PKIX

#
# The Java-level namelookup cache policy for successful lookups:
#
# any negative value: caching forever
# any positive value: the number of seconds to cache an address for
# zero: do not cache
#
# default value is forever (FOREVER). For security reasons, this
# caching is made forever when a security manager is set. When a security
# manager is not set, the default behavior in this implementation
# is to cache for 30 seconds.
#
# NOTE: setting this to anything other than the default value can have
#       serious security implications. Do not set it unless
#       you are sure you are not exposed to DNS spoofing attack.
#
#networkaddress.cache.ttl=-1

# The Java-level namelookup cache policy for failed lookups:
#
# any negative value: cache forever
# any positive value: the number of seconds to cache negative lookup results
# zero: do not cache
#
# In some Microsoft Windows networking environments that employ
# the WINS name service in addition to DNS, name service lookups
# that fail may take a noticeably long time to return (approx. 5 seconds).
# For this reason the default caching policy is to maintain these
# results for 10 seconds.
#
#
networkaddress.cache.negative.ttl=10

#
# Properties to configure OCSP for certificate revocation checking
#

# Enable OCSP
#
# By default, OCSP is not used for certificate revocation checking.
# This property enables the use of OCSP when set to the value "true".
#
# NOTE: SocketPermission is required to connect to an OCSP responder.
#
# Example,
#   ocsp.enable=true

#
# Location of the OCSP responder
#
# By default, the location of the OCSP responder is determined implicitly
# from the certificate being validated. This property explicitly specifies
# the location of the OCSP responder. The property is used when the
# Authority Information Access extension (defined in RFC 3280) is absent
# from the certificate or when it requires overriding.
#
# Example,
#   ocsp.responderURL=http://ocsp.example.net:80

#
# Subject name of the OCSP responder's certificate
#
# By default, the certificate of the OCSP responder is that of the issuer
# of the certificate being validated. This property identifies the certificate
# of the OCSP responder when the default does not apply. Its value is a string
# distinguished name (defined in RFC 2253) which identifies a certificate in
# the set of certificates supplied during cert path validation. In cases where
# the subject name alone is not sufficient to uniquely identify the certificate
# then both the "ocsp.responderCertIssuerName" and
# "ocsp.responderCertSerialNumber" properties must be used instead. When this
# property is set then those two properties are ignored.
#
# Example,
#   ocsp.responderCertSubjectName="CN=OCSP Responder, O=XYZ Corp"

#
# Issuer name of the OCSP responder's certificate
#
# By default, the certificate of the OCSP responder is that of the issuer
# of the certificate being validated. This property identifies the certificate
# of the OCSP responder when the default does not apply. Its value is a string
# distinguished name (defined in RFC 2253) which identifies a certificate in
# the set of certificates supplied during cert path validation. When this
# property is set then the "ocsp.responderCertSerialNumber" property must also
# be set. When the "ocsp.responderCertSubjectName" property is set then this
# property is ignored.
#
# Example,
#   ocsp.responderCertIssuerName="CN=Enterprise CA, O=XYZ Corp"

#
# Serial number of the OCSP responder's certificate
#
# By default, the certificate of the OCSP responder is that of the issuer
# of the certificate being validated. This property identifies the certificate
# of the OCSP responder when the default does not apply. Its value is a string
# of hexadecimal digits (colon or space separators may be present) which
# identifies a certificate in the set of certificates supplied during cert path
# validation. When this property is set then the "ocsp.responderCertIssuerName"
# property must also be set. When the "ocsp.responderCertSubjectName" property
# is set then this property is ignored.
#
# Example,
#   ocsp.responderCertSerialNumber=2A:FF:00

#
# Policy for failed Kerberos KDC lookups:
#
# When a KDC is unavailable (network error, service failure, etc), it is
# put inside a blacklist and accessed less often for future requests. The
# value (case-insensitive) for this policy can be:
#
# tryLast
#    KDCs in the blacklist are always tried after those not on the list.
#
# tryLess[:max_retries,timeout]
#    KDCs in the blacklist are still tried by their order in the configuration,
#    but with smaller max_retries and timeout values. max_retries and timeout
#    are optional numerical parameters (default 1 and 5000, which means once
#    and 5 seconds). Please notes that if any of the values defined here is
#    more than what is defined in krb5.conf, it will be ignored.
#
# Whenever a KDC is detected as available, it is removed from the blacklist.
# The blacklist is reset when krb5.conf is reloaded. You can add
# refreshKrb5Config=true to a JAAS configuration file so that krb5.conf is
# reloaded whenever a JAAS authentication is attempted.
#
# Example,
#   krb5.kdc.bad.policy = tryLast
#   krb5.kdc.bad.policy = tryLess:2,2000
krb5.kdc.bad.policy = tryLast

# Algorithm restrictions for certification path (CertPath) processing
#
# In some environments, certain algorithms or key lengths may be undesirable
# for certification path building and validation.  For example, "MD2" is
# generally no longer considered to be a secure hash algorithm.  This section
# describes the mechanism for disabling algorithms based on algorithm name
# and/or key length.  This includes algorithms used in certificates, as well
# as revocation information such as CRLs and signed OCSP Responses.
#
# The syntax of the disabled algorithm string is described as this Java
# BNF-style:
#   DisabledAlgorithms:
#       " DisabledAlgorithm { , DisabledAlgorithm } "
#
#   DisabledAlgorithm:
#       AlgorithmName [Constraint]
#
#   AlgorithmName:
#       (see below)
#
#   Constraint:
#       KeySizeConstraint
#
#   KeySizeConstraint:
#       keySize Operator DecimalInteger
#
#   Operator:
#       <= | < | == | != | >= | >
#
#   DecimalInteger:
#       DecimalDigits
#
#   DecimalDigits:
#       DecimalDigit {DecimalDigit}
#
#   DecimalDigit: one of
#       1 2 3 4 5 6 7 8 9 0
#
# The "AlgorithmName" is the standard algorithm name of the disabled
# algorithm. See "Java Cryptography Architecture Standard Algorithm Name
# Documentation" for information about Standard Algorithm Names.  Matching
# is performed using a case-insensitive sub-element matching rule.  (For
# example, in "SHA1withECDSA" the sub-elements are "SHA1" for hashing and
# "ECDSA" for signatures.)  If the assertion "AlgorithmName" is a
# sub-element of the certificate algorithm name, the algorithm will be
# rejected during certification path building and validation.  For example,
# the assertion algorithm name "DSA" will disable all certificate algorithms
# that rely on DSA, such as NONEwithDSA, SHA1withDSA.  However, the assertion
# will not disable algorithms related to "ECDSA".
#
# A "Constraint" provides further guidance for the algorithm being specified.
# The "KeySizeConstraint" requires a key of a valid size range if the
# "AlgorithmName" is of a key algorithm.  The "DecimalInteger" indicates the
# key size specified in number of bits.  For example, "RSA keySize <= 1024"
# indicates that any RSA key with key size less than or equal to 1024 bits
# should be disabled, and "RSA keySize < 1024, RSA keySize > 2048" indicates
# that any RSA key with key size less than 1024 or greater than 2048 should
# be disabled. Note that the "KeySizeConstraint" only makes sense to key
# algorithms.
#
# Note: This property is currently used by Oracle's PKIX implementation. It
# is not guaranteed to be examined and used by other implementations.
#
# Example:
#   jdk.certpath.disabledAlgorithms=MD2, DSA, RSA keySize < 2048
#
#
jdk.certpath.disabledAlgorithms=MD2, MD5, RSA keySize < 1024

# Algorithm restrictions for Secure Socket Layer/Transport Layer Security
# (SSL/TLS) processing
#
# In some environments, certain algorithms or key lengths may be undesirable
# when using SSL/TLS.  This section describes the mechanism for disabling
# algorithms during SSL/TLS security parameters negotiation, including
# protocol version negotiation, cipher suites selection, peer authentication
# and key exchange mechanisms.
#
# Disabled algorithms will not be negotiated for SSL/TLS connections, even
# if they are enabled explicitly in an application.
#
# For PKI-based peer authentication and key exchange mechanisms, this list
# of disabled algorithms will also be checked during certification path
# building and validation, including algorithms used in certificates, as
# well as revocation information such as CRLs and signed OCSP Responses.
# This is in addition to the jdk.certpath.disabledAlgorithms property above.
#
# See the specification of "jdk.certpath.disabledAlgorithms" for the
# syntax of the disabled algorithm string.
#
# Note: This property is currently used by Oracle's JSSE implementation.
# It is not guaranteed to be examined and used by other implementations.
#
# Example:
#   jdk.tls.disabledAlgorithms=MD5, SSLv3, DSA, RSA keySize < 2048
jdk.tls.disabledAlgorithms=SSLv3, RC4, MD5withRSA, DH keySize < 768

# Legacy algorithms for Secure Socket Layer/Transport Layer Security (SSL/TLS)
# processing in JSSE implementation.
#
# In some environments, a certain algorithm may be undesirable but it
# cannot be disabled because of its use in legacy applications.  Legacy
# algorithms may still be supported, but applications should not use them
# as the security strength of legacy algorithms are usually not strong enough
# in practice.
#
# During SSL/TLS security parameters negotiation, legacy algorithms will
# not be negotiated unless there are no other candidates.
#
# The syntax of the disabled algorithm string is described as this Java
# BNF-style:
#   LegacyAlgorithms:
#       " LegacyAlgorithm { , LegacyAlgorithm } "
#
#   LegacyAlgorithm:
#       AlgorithmName (standard JSSE algorithm name)
#
# See the specification of security property "jdk.certpath.disabledAlgorithms"
# for the syntax and description of the "AlgorithmName" notation.
#
# Per SSL/TLS specifications, cipher suites have the form:
#       SSL_KeyExchangeAlg_WITH_CipherAlg_MacAlg
# or
#       TLS_KeyExchangeAlg_WITH_CipherAlg_MacAlg
#
# For example, the cipher suite TLS_RSA_WITH_AES_128_CBC_SHA uses RSA as the
# key exchange algorithm, AES_128_CBC (128 bits AES cipher algorithm in CBC
# mode) as the cipher (encryption) algorithm, and SHA-1 as the message digest
# algorithm for HMAC.
#
# The LegacyAlgorithm can be one of the following standard algorithm names:
#     1. JSSE cipher suite name, e.g., TLS_RSA_WITH_AES_128_CBC_SHA
#     2. JSSE key exchange algorithm name, e.g., RSA
#     3. JSSE cipher (encryption) algorithm name, e.g., AES_128_CBC
#     4. JSSE message digest algorithm name, e.g., SHA
#
# See SSL/TLS specifications and "Java Cryptography Architecture Standard
# Algorithm Name Documentation" for information about the algorithm names.
#
# Note: This property is currently used by Oracle's JSSE implementation.
# It is not guaranteed to be examined and used by other implementations.
# There is no guarantee the property will continue to exist or be of the
# same syntax in future releases.
#
# Example:
#   jdk.tls.legacyAlgorithms=DH_anon, DES_CBC, SSL_RSA_WITH_RC4_128_MD5
#
jdk.tls.legacyAlgorithms= \
        K_NULL, C_NULL, M_NULL, \
        DHE_DSS_EXPORT, DHE_RSA_EXPORT, DH_anon_EXPORT, DH_DSS_EXPORT, \
        DH_RSA_EXPORT, RSA_EXPORT, \
        DH_anon, ECDH_anon, \
        RC4_128, RC4_40, DES_CBC, DES40_CBC

# The pre-defined default finite field Diffie-Hellman ephemeral (DHE)
# parameters for Transport Layer Security (SSL/TLS/DTLS) processing.
#
# In traditional SSL/TLS/DTLS connections where finite field DHE parameters
# negotiation mechanism is not used, the server offers the client group
# parameters, base generator g and prime modulus p, for DHE key exchange.
# It is recommended to use dynamic group parameters.  This property defines
# a mechanism that allows you to specify custom group parameters.
#
# The syntax of this property string is described as this Java BNF-style:
#   DefaultDHEParameters:
#       DefinedDHEParameters { , DefinedDHEParameters }
#
#   DefinedDHEParameters:
#       "{" DHEPrimeModulus , DHEBaseGenerator "}"
#
#   DHEPrimeModulus:
#       HexadecimalDigits
#
#   DHEBaseGenerator:
#       HexadecimalDigits
#
#   HexadecimalDigits:
#       HexadecimalDigit { HexadecimalDigit }
#
#   HexadecimalDigit: one of
#       0 1 2 3 4 5 6 7 8 9 A B C D E F a b c d e f
#
# Whitespace characters are ignored.
#
# The "DefinedDHEParameters" defines the custom group parameters, prime
# modulus p and base generator g, for a particular size of prime modulus p.
# The "DHEPrimeModulus" defines the hexadecimal prime modulus p, and the
# "DHEBaseGenerator" defines the hexadecimal base generator g of a group
# parameter.  It is recommended to use safe primes for the custom group
# parameters.
#
# If this property is not defined or the value is empty, the underlying JSSE
# provider's default group parameter is used for each connection.
#
# If the property value does not follow the grammar, or a particular group
# parameter is not valid, the connection will fall back and use the
# underlying JSSE provider's default group parameter.
#
# Note: This property is currently used by OpenJDK's JSSE implementation. It
# is not guaranteed to be examined and used by other implementations.
#
# Example:
#   jdk.tls.server.defaultDHEParameters=
#       { \
#       FFFFFFFF FFFFFFFF C90FDAA2 2168C234 C4C6628B 80DC1CD1 \
#       29024E08 8A67CC74 020BBEA6 3B139B22 514A0879 8E3404DD \
#       EF9519B3 CD3A431B 302B0A6D F25F1437 4FE1356D 6D51C245 \
#       E485B576 625E7EC6 F44C42E9 A637ED6B 0BFF5CB6 F406B7ED \
#       EE386BFB 5A899FA5 AE9F2411 7C4B1FE6 49286651 ECE65381 \
#       FFFFFFFF FFFFFFFF, 2}

# Algorithm restrictions for signed JAR files
#
# In some environments, certain algorithms or key lengths may be undesirable
# for signed JAR validation.  For example, "MD2" is generally no longer
# considered to be a secure hash algorithm.  This section describes the
# mechanism for disabling algorithms based on algorithm name and/or key length.
# JARs signed with any of the disabled algorithms or key sizes will be treated
# as unsigned.
#
# The syntax of the disabled algorithm string is described as follows:
#   DisabledAlgorithms:
#       " DisabledAlgorithm { , DisabledAlgorithm } "
#
#   DisabledAlgorithm:
#       AlgorithmName [Constraint]
#
#   AlgorithmName:
#       (see below)
#
#   Constraint:
#       KeySizeConstraint
#
#   KeySizeConstraint:
#       keySize Operator KeyLength
#
#   Operator:
#       <= | < | == | != | >= | >
#
#   KeyLength:
#       Integer value of the algorithm's key length in bits
#
# Note: This property is currently used by the JDK Reference
# implementation. It is not guaranteed to be examined and used by other
# implementations.
#
jdk.jar.disabledAlgorithms=MD2, RSA keySize < 1024