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If the right version of GnuPG is not currently distributed for your platform, you need to install it. Once you generate the key, you can use it with the widely available 1.4.9 and 2.x releases.
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2.0.12 or higher (well-known, portable version).To easily generate a 4096 bit RSA signing and encryption key pair with strong digests, use either GnuPG version: Then you can follow the procedure for 4096 bits.
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For the present, 4096 bit RSA should be strong enough for code signing at Apache. Though 8192 bit keys are stronger, they are slower and may be incompatible with some older clients. All new keys generated should be RSA with at least 4096 bits. For those with 2048 bit RSA keys, the best advice is to switch to SHA256 or SHA512 as soon as possible. For now, the 2048 bit RSA keys with SHA256 hash should be strong enough. The next generation of OpenPGP will use SHA-3. Though no realistic attack against those keys have been made public and these keys continue to be useful (and do not need to be revoked), Projects should not generate new keys that are exposed to this weakness. The weaknesses found in SHA-1 threaten all DSA keys and those RSA keys with length less than 2048 bits. Then upload the modified public key to a public keyserver. User: "Example Key (NOT FOR DISTRIBUTION) " You need a passphrase to unlock the secret key for
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Example Key (NOT FOR DISTRIBUTION) Ĭompression: ZLIB, BZIP2, ZIP, UncompressedĬommand> setpref SHA512 SHA384 SHA256 SHA224 AES256 AES192 AES CAST5 ZLIB BZIP2 ZIP Uncompressedĭigest: SHA512, SHA384, SHA256, SHA224, SHA1 Sub 1024g/D55BD150 created: expires: usage: E Pub 1024D/F8B7B4FD created: expires: usage: SC This is free software, and you are welcome to redistribute it This program comes with ABSOLUTELY NO WARRANTY. Gpg (GnuPG) 1.4.9 Copyright (C) 2008 Free Software Foundation, Inc. For each public-private key pair (generated with the previous defaults): :::console Once theĬonfiguration has been updated to avoid SHA-1, all new keys generated will use these defaults, but keys generated before the configuration won't be affected.Īll existing private keys in the ring need to be updated to indicate that stronger hashes are preferred. The digest preferences for each key (from the configuration defaults ) are set when the key is generated. default-preference-list - the default algorithm preferences for new keys (this does not affect existing keys: see next paragraph)ĭefault-preference-list SHA512 SHA384 SHA256 SHA224 AES256 AES192 AES CAST5 ZLIB BZIP2 ZIP Uncompressed.personal-digest-preferences - the digest used for signing messages.cert-digest-algo - the certificate digest used when linking into the web of trust.Options need to be added or given the correct values for: To configure gpg to avoid SHA-1, edit the options in gpg.conf. Though some oldĬlients lack SHA512 support, we recommend switching to SHA512 if possible. By default, this is located in the GnuPG Home directory. You can specify them on the command line, but it is usually more convenient to set them in the gpg.conf file. GnuPG supports a wide range of configuration options. When switching key rings, check that the required keyring has been selected by examining the secret keys. This is useful when practicing and when using multiple keyrings.įor example, to set home directory to alice when using Linux: :::console This lets you select a specific configuration and keyring for the duration of aĬommand line session. You can set Home using an envionmental variable. For \*nux (linux, BSD, MaxOSX, Solaris, AIX) this is: :::shell $ gpg -homedir /home/alice/keys -list-keys This allows different configurations and keys to be used. You can specify your proejct's home directory in an environmental variable or on the command line.
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GnuPG stores important files, including keyrings and configuration files, in a home directory.
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This guide covers only some important points.
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The Apaches Software Foundation recommends using Gnu Privacy Guard (GPG), a well-known open source cryptography tool with OpenPGP support. Reliable cryptography applications follow OpenPGP, an open standard of Pretty Good Privacy (PGP) encryption software, standard (RFC 4880), for encrypting and decrypting data. The program provides cryptographic privacy and authentication for data communication, covering signing, encrypting, and decrypting texts, e-mails, files, directories, and whole disk partitions and increasing the security of e-mail communications.
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update Apache documents with details of a new key.