183:(TOFU) model. Encryption of messages between Autocrypt-capable clients can be enabled without further need of user interaction. Traditional OpenPGP applications should display a noticeable warning if keys are not verified either manually or by a web of trust method before use. In contrast, Autocrypt completely resigns on any kind of key verification. Key exchange is during the initial handshake and valid or invalid keys of peers may be replaced anytime later without any user interaction or verification. This makes it very easy to exchange new key(s) if a user loses access to the key but also makes the protocol much more susceptible to man-in-the-middle attacks than clean TOFU. The underlying OpenPGP implementation makes it often possible for the user to perform manual out of band key verification, however by design users are never alerted if Autocrypt changed the keys of peers.
758:. [Our contribution to security: We additionally secure the key exchange with Autocrypt with digital signatures (DKIM). This is not currently provided as standard with Autocrypt. Our provider-side DKIM signature ensures that public keys cannot be manipulated unnoticed during transport. We also sign Autocrypt headers that your local email program may add with DKIM. The signature is applied if the sender matches the mailbox. We save the key exchange with Autocrypt additionally with digital signatures (DKIM). This is not yet provided by default at Autocrypt. Our provider-side DKIM signing ensures that public keys cannot be manipulated unnoticed on transport. We also sign autocrypt header, which your local email program may add, with DKIM. The signature is made when the sender matches the mailbox.]
256:;prefer-encrypt=mutual;keydata= mDMEXEcE6RYJKwYBBAHaRw8BAQdArjWwk3FAqyiFbFBKT4TzXcVBqPTB3gmzlC/Ub7O1u12 0F2FsaWNlQGF1dG9jcnlwdC5leGFtcGxliJYEExYIAD4WIQTrhbtfozp14V6UTmPyMVUMT0 fjjgUCXEcE6QIbAwUJA8JnAAULCQgHAgYVCgkICwIEFgIDAQIeAQIXgAAKCRDyMVUMT0fjj kqLAP9frlijwBJvA+HFnqCZcYIVxlyXzS5Gi5gMTpp37K73jgD/VbKYhkwk9iu689OYH4K 7q7LbmdeaJ+RX88Y/ad9hZwy4OARcRwTpEgorBgEEAZdVAQUBAQdAQv8GIa2rSTzgqbXCp DDYMiKRVitCsy203x3sE9+eviIDAQgHiHgEGBYIACAWIQTrhbtfozp14V6UTmPyMVUMT0fj jgUCXEcE6QIbDAAKCRDyMVUMT0fjjlnQAQDFHUs6TIcxrNTtEZFjUFm1M0PJ1Dng/cDW4xN 80fsn0QEA22Kr7VkCjeAEC08VSTeV+QFsmz55/lntWkwYWhmvOgE=
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Autocrypt-capable email clients transparently negotiate encryption capabilities and preferences and exchange keys between users alongside sending regular emails. This is done by including the key material and encryption preferences in the header of each email, which allows encrypting any message to
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Autocrypt tries to maximize the possible opportunities for encryption, but is not aggressive about encrypting messages at all possible opportunities. Instead, encryption is only enabled by default if all communicating parties consent, allowing users to make themselves available for encrypted
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partially supports AutoCrypt since version 78. Thunderbird generates, sends and receives AutoCrypt headers, but does not automatically install received public keys. User action is still required to approve and install a sender's public
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When a message is encrypted to a group of receivers, keys are also automatically sent to all receivers in this group. This ensures that a reply to a message can be encrypted without any further complications or work by the user.
326:
Autocrypt - in: Bertram, Linda A. / Dooble, Gunther van / et al. (Eds.): Nomenclatura: Encyclopedia of modern
Cryptography and Internet Security - From AutoCrypt and Exponential Encryption to Zero-Knowledge-Proof Keys, 2019,
212:
keys, with a recommended RSA key length of 3072 bits. These mechanisms are chosen for maximum compatibility with existing OpenPGP implementations. There are plans for moving to smaller
819:
Transformation of
Cryptography: Fundamental concepts of Encryption, Milestones, Mega-Trends and sustainable Change in regard to Secret Communications and its Nomenclatura
887:
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Any attacker who can send emails with forged sender-address can cause encryption keys to be replaced by keys of his choice and/or deliberately turn off encryption.
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a contact who has previously sent the user email. This information is not signed or verified in any way even if the actual message is encrypted and verified.
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Autocrypt is guided by the idea of opportunistic security from RFC 7435 but implementing something much less secure than a
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supports AutoCrypt, and improves its security by also cryptographically signing outbound
Autocrypt header data via
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Autocrypt uses the established OpenPGP specification as its underlying data format. Messages are encrypted using
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The New Era Of
Exponential Encryption: - Beyond Cryptographic Routing with the Echo Protocol [Paperback]
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tag contains the public key. It is similar to an armored key export, except that it misses the
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Android mail-app has support since
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other than preserving and not manipulating the
Autocrypt specific header fields.
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communication without getting in the way of their established workflows.
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480:"Bye-bye Enigmail!: OpenPGP wird in Thunderbird integriert - Golem.de"
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was released in
December 2017 and makes no attempt to protect against
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The New Era Of
Exponential Encryption: - Beyond Cryptographic Routing
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are not preventable in this security model, which is controversial.
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replacing its complex key management by fully automated exchange of
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Transformation of
Cryptography: Fundamental concepts of Encryption
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Paul Brown, Carl Schwan, and Áron Kovács (22 April 2021).
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No longer functional: Autocrypt extension in
Thunderbird.
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Bertram, Linda A.; Dooble, Gunther van (31 July 2019).
387:(in German), vol. 2018, no. 5, pp. 64–66
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531:"Autocrypt FAQ — Why RSA3072 and 25519 only later?"
48:. Unsourced material may be challenged and removed.
227:format common to several mechanisms (for example
843:Gasakis, Mele; Schmidt, Max (8 January 2019).
796:"Enigmail - 2018-03-25 Enigmail v2.0 released"
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381:"Autocrypt automatisiert E-Mail-Kryptografie"
131:aiming to simplify key exchange and enabling
8:
601:: CS1 maint: multiple names: authors list (
216:keys when support is more widely available.
617:"Delta Chat v0.9.2 feat. Autocrypt Level 1"
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108:Learn how and when to remove this message
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718:"Does Thunderbird support Autocrypt?"
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237:-----BEGIN PGP PUBLIC KEY BLOCK-----
46:adding citations to reliable sources
241:-----END PGP PUBLIC KEY BLOCK-----
14:
691:"Releases: the-djmaze/snappymail"
379:Bundesmann, Jan (18 April 2018),
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143:. It is implemented on top of
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1:
750:(in German). 18 December 2017
254:addr=alice@autocrypt.example
163:No support is required from
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363:Autocrypt 1.0 Spezifikation
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294:The German email provider
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849:. BoD – Books on Demand.
822:. BoD – Books on Demand.
582:"KDE Gear 21.04 released"
191:Man-in-the-middle attacks
1743:Timeline of cryptography
638:"5.4 Release | K-9 Mail"
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223:header field features a
1738:Outline of cryptography
1709:Anti–computer forensics
137:Autocrypt specification
1824:Cryptographic software
1765:Homomorphic encryption
1758:List of hash functions
897:Cryptographic software
774:addons.thunderbird.net
556:"The Autocrypt Header"
369:Autocrypt mailing list
308:No longer functional:
135:. Version 1.0 of the
125:cryptographic protocol
1770:End-to-end encryption
374:Autocrypt github repo
794:Patrick Brunschwig.
273:Delta Chat messenger
269:since version 21.04.
42:improve this article
644:on 21 December 2018
275:from Version 0.9.2.
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316:since version 2.0.
181:trust on first use
149:cryptographic keys
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357:Autocrypt Website
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31:This article
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1577:File systems
1487:Private Disk
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799:. Retrieved
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385:Heise Select
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141:MITM attacks
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40:Please help
35:verification
32:
15:
1692:Educational
1497:Sentry 2020
1442:DriveSentry
1362:Google Allo
968:Thunderbird
770:"Autocrypt"
702:17 February
675:27 February
490:23 December
486:(in German)
403:(in German)
310:Thunderbird
288:Thunderbird
57:"Autocrypt"
1818:Categories
1683:NordLocker
1627:Tahoe-LAFS
1617:Rubberhose
1557:RetroShare
1432:Cryptoloop
1427:CrossCrypt
1407:Comparison
1377:TextSecure
1335:ChatSecure
1297:RetroShare
1287:Bitmessage
1226:strongSwan
1012:ChatSecure
923:Claws Mail
913:Apple Mail
515:1 December
439:8 December
417:References
312:extension
251:Autocrypt:
133:encryption
68:newspapers
1524:Anonymity
1514:VeraCrypt
1502:TrueCrypt
1492:Scramdisk
1457:FileVault
1422:BitLocker
1417:BestCrypt
1330:Cryptocat
1236:WireGuard
1138:MatrixSSL
1108:BoringSSL
1070:SecureCRT
1032:Profanity
1007:Centericq
918:Autocrypt
779:8 October
748:Posteo.de
225:tag=value
221:Autocrypt
121:Autocrypt
1829:Security
1793:Category
1699:CrypTool
1673:Tresorit
1602:eCryptfs
1562:Ricochet
1462:FreeOTFE
1452:eCryptfs
1437:dm-crypt
1382:WhatsApp
1259:Linphone
1211:Openswan
1178:TeamNote
1163:SChannel
1153:mbed TLS
1133:LibreSSL
1118:cryptlib
1050:Dropbear
963:Sylpheed
928:Enigmail
801:24 April
754:24 April
648:24 April
622:26 April
597:cite web
587:22 April
540:29 April
464:28 April
407:24 April
391:24 April
314:Enigmail
279:K-9 Mail
1803:Commons
1722:BusKill
1717:USBKill
1668:Freenet
1552:Vidalia
1507:History
1482:PGPDisk
1388:SimpleX
1347:Session
1342:Proteus
1216:OpenVPN
1206:Hamachi
1183:wolfSSL
1173:stunnel
1148:OpenSSL
1080:wolfSSH
1060:OpenSSH
1002:BitlBee
948:Outlook
943:Kontact
937:Gpg4win
728:25 June
365:(engl.)
359:(engl.)
339:OpenPGP
267:Kontact
261:Support
243:lines.
233:keydata
145:OpenPGP
82:scholar
1775:S/MIME
1622:StegFS
1532:GNUnet
1372:Signal
1320:Matrix
1168:SSLeay
1123:GnuTLS
1075:WinSCP
1027:Kopete
978:Secure
853:
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696:GitHub
669:GitHub
565:29 May
331:
296:Posteo
155:Method
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1678:Wuala
1652:Qubes
1647:Tails
1592:EncFS
1567:Wickr
1325:OMEMO
1292:Briar
1269:Zfone
1254:Jitsi
1158:BSAFE
1113:Botan
1065:PuTTY
1022:Jitsi
1017:climm
997:Adium
123:is a
89:JSTOR
75:books
1612:PEFS
1607:LUKS
1582:List
1477:LUKS
1472:geli
1467:GBDE
1264:Jami
1246:ZRTP
1231:Tinc
1128:JSSE
851:ISBN
824:ISBN
803:2018
781:2019
756:2018
730:2024
704:2024
677:2021
650:2018
624:2018
603:link
589:2021
567:2024
542:2018
517:2019
492:2019
466:2018
441:2019
409:2018
399:iX.
393:2018
329:ISBN
300:DKIM
291:key.
239:and
229:dkim
219:The
208:and
127:for
61:news
1597:EFS
1547:Tor
1537:I2P
1447:E4M
1312:DRA
1302:Tox
1279:P2P
1193:VPN
1143:NSS
1055:lsh
1042:SSH
989:OTR
958:PGP
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210:RSA
206:AES
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Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
