Re: [openpgp] AEAD Chunk Size
"Neal H. Walfield" <neal@walfield.org> Sat, 30 March 2019 21:16 UTC
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Date: Sat, 30 Mar 2019 22:16:46 +0100
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From: "Neal H. Walfield" <neal@walfield.org>
To: Benjamin Kaduk <kaduk@mit.edu>
Cc: Bart Butler <bartbutler@protonmail.com>, "openpgp@ietf.org" <openpgp@ietf.org>, Peter Gutmann <pgut001@cs.auckland.ac.nz>, Justus Winter <justuswinter@gmail.com>, Jon Callas <joncallas@icloud.com>, Jon Callas <joncallas=40icloud.com@dmarc.ietf.org>
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Subject: Re: [openpgp] AEAD Chunk Size
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Hi Ben, Thanks for your note. At Sat, 30 Mar 2019 10:04:38 -0500, Benjamin Kaduk wrote: > I also have a use case for authentication of large chunks of data at rest: > they allow me to use a cheap bulk storage service that provides > (best-effort) replication and archiving but has poor physical security. So > I encrypt my data to myself and put it in storage, but when I get it back > I need to know that it's valid. I can imagine at least one case where > knowing exactly which chunk was corrupted would save effort; it may be a > toy example but perhaps it is illustrative of a broader case. Note that > there are algorithms to compute pi to arbitrary precision, and even to > compute the Nth digit thereof without coputing the previous digits. If I > need to have random-access inquiries into the value of pi, I could > precompute using softare I trust and do this self-encryption thing, and > when a chunk is bad I can recompute only that chunk and still trust that I > only ever use values generated by my trusted implementation. Just to be clear: when you say "large chunks of data at rest," you're not arguing that large AEAD chunks are better, are you? It seems to me that if you use small chunks, at least in your example, you have less work to do when you discover a corrupted chunk. Thanks, :) Neal
- Re: [openpgp] AEAD Chunk Size Justus Winter
- [openpgp] AEAD Chunk Size Neal H. Walfield
- Re: [openpgp] AEAD Chunk Size Vincent Breitmoser
- Re: [openpgp] AEAD Chunk Size Bart Butler
- Re: [openpgp] AEAD Chunk Size Jon Callas
- Re: [openpgp] AEAD Chunk Size Bart Butler
- Re: [openpgp] AEAD Chunk Size Jon Callas
- Re: [openpgp] AEAD Chunk Size Ronald Tse
- Re: [openpgp] AEAD Chunk Size Ronald Tse
- Re: [openpgp] AEAD Chunk Size Bart Butler
- Re: [openpgp] AEAD Chunk Size Hanno Böck
- Re: [openpgp] AEAD Chunk Size - Performance Neal H. Walfield
- Re: [openpgp] AEAD Chunk Size Neal H. Walfield
- Re: [openpgp] AEAD Chunk Size Neal H. Walfield
- Re: [openpgp] AEAD Chunk Size Neal H. Walfield
- Re: [openpgp] AEAD Chunk Size Neal H. Walfield
- Re: [openpgp] AEAD Chunk Size Jon Callas
- Re: [openpgp] AEAD Chunk Size - Performance Bart Butler
- Re: [openpgp] AEAD Chunk Size Bart Butler
- Re: [openpgp] AEAD Chunk Size Bart Butler
- Re: [openpgp] AEAD Chunk Size brian m. carlson
- Re: [openpgp] AEAD Chunk Size Neal H. Walfield
- Re: [openpgp] AEAD Chunk Size - Performance Neal H. Walfield
- Re: [openpgp] AEAD Chunk Size Neal H. Walfield
- Re: [openpgp] AEAD Chunk Size Tobias Mueller
- Re: [openpgp] AEAD Chunk Size Sebastian Schinzel
- Re: [openpgp] AEAD Chunk Size Neal H. Walfield
- Re: [openpgp] AEAD Chunk Size Neal H. Walfield
- Re: [openpgp] AEAD Chunk Size Werner Koch
- Re: [openpgp] AEAD Chunk Size Vincent Breitmoser
- Re: [openpgp] AEAD Chunk Size Sebastian Schinzel
- Re: [openpgp] AEAD Chunk Size Derek Atkins
- Re: [openpgp] AEAD Chunk Size Neal H. Walfield
- Re: [openpgp] AEAD Chunk Size Derek Atkins
- Re: [openpgp] AEAD Chunk Size Neal H. Walfield
- Re: [openpgp] AEAD Chunk Size Werner Koch
- Re: [openpgp] AEAD Chunk Size Derek Atkins
- Re: [openpgp] AEAD Chunk Size Neal H. Walfield
- Re: [openpgp] AEAD Chunk Size Neal H. Walfield
- Re: [openpgp] AEAD Chunk Size Tobias Mueller
- Re: [openpgp] AEAD Chunk Size Tobias Mueller
- Re: [openpgp] AEAD Chunk Size Tobias Mueller
- Re: [openpgp] AEAD Chunk Size Tobias Mueller
- Re: [openpgp] AEAD Chunk Size Tobias Mueller
- Re: [openpgp] AEAD Chunk Size Werner Koch
- Re: [openpgp] AEAD Chunk Size Neal H. Walfield
- Re: [openpgp] AEAD Chunk Size Neal H. Walfield
- Re: [openpgp] AEAD Chunk Size Tobias Mueller
- Re: [openpgp] AEAD Chunk Size Tobias Mueller
- Re: [openpgp] AEAD Chunk Size Neal H. Walfield
- Re: [openpgp] AEAD Chunk Size Vincent Breitmoser
- Re: [openpgp] AEAD Chunk Size Peter Pentchev
- Re: [openpgp] AEAD Chunk Size Vincent Breitmoser
- Re: [openpgp] AEAD Chunk Size Neal H. Walfield
- Re: [openpgp] AEAD Chunk Size Derek Atkins
- Re: [openpgp] AEAD Chunk Size Vincent Breitmoser
- Re: [openpgp] AEAD Chunk Size Neal H. Walfield
- Re: [openpgp] AEAD Chunk Size Vincent Breitmoser
- Re: [openpgp] AEAD Chunk Size Tobias Mueller
- Re: [openpgp] AEAD Chunk Size Neal H. Walfield
- Re: [openpgp] AEAD Chunk Size Bill Frantz
- [openpgp] WTF (Re: AEAD Chunk Size) Andre Heinecke
- Re: [openpgp] AEAD Chunk Size Werner Koch
- Re: [openpgp] AEAD Chunk Size Neal H. Walfield
- Re: [openpgp] AEAD Chunk Size Werner Koch
- Re: [openpgp] AEAD Chunk Size Neal H. Walfield
- Re: [openpgp] AEAD Chunk Size Derek Atkins
- Re: [openpgp] AEAD Chunk Size Neal H. Walfield
- Re: [openpgp] AEAD Chunk Size Marcus Brinkmann
- Re: [openpgp] AEAD Chunk Size Nickolay Olshevsky
- Re: [openpgp] AEAD Chunk Size Derek Atkins
- Re: [openpgp] AEAD Chunk Size Tobias Mueller
- Re: [openpgp] AEAD Chunk Size Tobias Mueller
- Re: [openpgp] AEAD Chunk Size Derek Atkins
- Re: [openpgp] AEAD Chunk Size Neal H. Walfield
- Re: [openpgp] AEAD Chunk Size Bill Frantz
- Re: [openpgp] AEAD Chunk Size Jon Callas
- Re: [openpgp] AEAD Chunk Size Jon Callas
- Re: [openpgp] AEAD Chunk Size Neal H. Walfield
- Re: [openpgp] AEAD Chunk Size Bart Butler
- Re: [openpgp] AEAD Chunk Size Marcus Brinkmann
- Re: [openpgp] AEAD Chunk Size Bill Frantz
- Re: [openpgp] AEAD Chunk Size Jon Callas
- Re: [openpgp] AEAD Chunk Size Peter Gutmann
- Re: [openpgp] AEAD Chunk Size Peter Gutmann
- Re: [openpgp] AEAD Chunk Size Peter Gutmann
- Re: [openpgp] AEAD Chunk Size Peter Gutmann
- Re: [openpgp] AEAD Chunk Size Bill Frantz
- Re: [openpgp] AEAD Chunk Size Neal H. Walfield
- Re: [openpgp] AEAD Chunk Size Neal H. Walfield
- Re: [openpgp] AEAD Chunk Size Marcus Brinkmann
- Re: [openpgp] AEAD Chunk Size Marcus Brinkmann
- Re: [openpgp] AEAD Chunk Size Peter Gutmann
- Re: [openpgp] AEAD Chunk Size Neal H. Walfield
- Re: [openpgp] AEAD Chunk Size Peter Gutmann
- Re: [openpgp] AEAD Chunk Size Neal H. Walfield
- Re: [openpgp] AEAD Chunk Size Jon Callas
- Re: [openpgp] AEAD Chunk Size Wyllys Ingersoll
- Re: [openpgp] AEAD Chunk Size Jon Callas
- Re: [openpgp] AEAD Chunk Size Jon Callas
- Re: [openpgp] AEAD Chunk Size Jon Callas
- Re: [openpgp] AEAD Chunk Size brian m. carlson
- Re: [openpgp] AEAD Chunk Size Bart Butler
- Re: [openpgp] AEAD Chunk Size Benjamin Kaduk
- Re: [openpgp] AEAD Chunk Size Bart Butler
- Re: [openpgp] AEAD Chunk Size Benjamin Kaduk
- Re: [openpgp] AEAD Chunk Size Neal H. Walfield
- Re: [openpgp] AEAD Chunk Size Jon Callas
- Re: [openpgp] AEAD Chunk Size Peter Gutmann
- Re: [openpgp] AEAD Chunk Size Bart Butler
- Re: [openpgp] AEAD Chunk Size Benjamin Kaduk
- Re: [openpgp] AEAD Chunk Size Conrado P. L. Gouvêa
- Re: [openpgp] AEAD Chunk Size Conrado P. L. Gouvêa
- Re: [openpgp] AEAD Chunk Size Jon Callas
- Re: [openpgp] AEAD Chunk Size Neal H. Walfield
- Re: [openpgp] AEAD Chunk Size Neal H. Walfield
- Re: [openpgp] AEAD Chunk Size Derek Atkins
- Re: [openpgp] AEAD Chunk Size Neal H. Walfield
- Re: [openpgp] AEAD Chunk Size Derek Atkins
- Re: [openpgp] AEAD Chunk Size Derek Atkins
- Re: [openpgp] AEAD Chunk Size Jon Callas
- Re: [openpgp] AEAD Chunk Size Derek Atkins
- Re: [openpgp] AEAD Chunk Size Jon Callas
- Re: [openpgp] AEAD Chunk Size Heiko Stamer
- Re: [openpgp] AEAD Chunk Size Bart Butler
- Re: [openpgp] AEAD Chunk Size Bart Butler
- Re: [openpgp] AEAD Chunk Size Derek Atkins
- Re: [openpgp] AEAD Chunk Size Werner Koch
- Re: [openpgp] AEAD Chunk Size Benjamin Kaduk
- Re: [openpgp] [EXT] Re: AEAD Chunk Size Neil Hunsperger