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< h1 > Режимы работы< / h1 >
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Для шифрования разделов, дисков и виртуальных томов VeraCrypt использует режим работы XTS.
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Режим XTS это фактически режим XEX < a href = "http://www.cs.ucdavis.edu/%7Erogaway/papers/offsets.pdf" >
[12]< / a > , который в 2003 г о у с
один ключ для двух разных целей, тогда как режим XTS использует два независимых ключа).< br style = "text-align:left" >
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В
конфиденциальных данных на устройствах хранения информации [24]. В г о у
(Институтом инженеров по электротехнике и электронике США) для криптографической защиты данных в
блочно-ориентированных устройствах хранения информации (IEEE < / div >
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< strong style = "text-align:left" > Описание режима XTS< / strong > :< / h2 >
< div style = "text-align:left; margin-top:19px; margin-bottom:19px; padding-top:0px; padding-bottom:0px" >
< em style = "text-align:left" > C< sub style = "text-align:left; font-size:85%" > i< / sub > < / em > =
< em style = "text-align:left" > E< / em > < sub style = "text-align:left; font-size:85%" > < em style = "text-align:left" > K< / em > 1< / sub > (< em style = "text-align:left" > P< sub style = "text-align:left; font-size:85%" > i< / sub > < / em > ^ (< em style = "text-align:left" > E< / em > < sub style = "text-align:left; font-size:85%" > < em style = "text-align:left" > K< / em > 2< / sub > (< em style = "text-align:left" > n< / em > )
< img src = "gf2_mul.gif" alt = "" width = "10" height = "10" >
< em style = "text-align:left" > a< sup style = "text-align:left; font-size:85%" > i< / sup > < / em > )) ^ (< em style = "text-align:left" > E< / em > < sub style = "text-align:left; font-size:85%" > < em style = "text-align:left" > K< / em > 2< / sub > (< em style = "text-align:left" > n< / em > )
< img src = "gf2_mul.gif" alt = "" width = "10" height = "10" > < em style = "text-align:left" > a< sup style = "text-align:left; font-size:85%" > i< / sup > < / em > )< / div >
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где:< / div >
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< tr style = "text-align:left" >
< td style = "vertical-align:top; color:#000000; text-align:left; font-size:11px; line-height:13px; font-family:Verdana,Arial,Helvetica,sans-serif; padding:0px" >
< sup style = "text-align:left; font-size:85%" > < img src = "gf2_mul.gif" alt = "" width = "10" height = "10" > < / sup > < / td >
< td style = "vertical-align:top; color:#000000; text-align:left; font-size:11px; line-height:13px; font-family:Verdana,Arial,Helvetica,sans-serif; padding:0px" >
означает умножение двух полиномов в бинарном поле GF(2) по модулю < em style = "text-align:left" >
x< / em > < sup style = "text-align:left; font-size:85%" > 128< / sup > + < em style = "text-align:left" > x< / em > < sup style = "text-align:left; font-size:85%" > 7< / sup > + < em style = "text-align:left" > x< / em > < sup style = "text-align:left; font-size:85%" > 2< / sup > + < em style = "text-align:left" > x< / em > + 1< / td >
< / tr >
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< td style = "width:30px; vertical-align:top; color:#000000; text-align:left; font-size:11px; line-height:13px; font-family:Verdana,Arial,Helvetica,sans-serif; padding:0px" >
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< em style = "text-align:left" > K< / em > 1< / td >
< td style = "width:578px; vertical-align:top; color:#000000; text-align:left; font-size:11px; line-height:13px; font-family:Verdana,Arial,Helvetica,sans-serif; padding:0px" >
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это ключ шифрования (256-битовый для каждого поддерживаемого шифра, то есть AES, Serpent и Twofish)< / td >
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< / tr >
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< td style = "vertical-align:top; color:#000000; text-align:left; font-size:11px; line-height:13px; font-family:Verdana,Arial,Helvetica,sans-serif; padding:0px" >
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< em style = "text-align:left" > K< / em > 2< / td >
< td style = "vertical-align:top; color:#000000; text-align:left; font-size:11px; line-height:13px; font-family:Verdana,Arial,Helvetica,sans-serif; padding:0px" >
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это вторичный ключ (256-битовый для каждого поддерживаемого шифра, то есть AES, Serpent и Twofish)< / td >
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< / tr >
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< td style = "vertical-align:top; color:#000000; text-align:left; font-size:11px; line-height:13px; font-family:Verdana,Arial,Helvetica,sans-serif; padding:0px" >
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< em style = "text-align:left" > i< / em > < / td >
< td style = "vertical-align:top; color:#000000; text-align:left; font-size:11px; line-height:13px; font-family:Verdana,Arial,Helvetica,sans-serif; padding:0px" >
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это индекс шифроблока внутри единицы данных; для первого шифроблока внутри единицы данных
< em style = "text-align:left" > i< / em > = 0< / td >
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< td style = "vertical-align:top; color:#000000; text-align:left; font-size:11px; line-height:13px; font-family:Verdana,Arial,Helvetica,sans-serif; padding:0px" >
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< em style = "text-align:left" > n< / em > < / td >
< td style = "vertical-align:top; color:#000000; text-align:left; font-size:11px; line-height:13px; font-family:Verdana,Arial,Helvetica,sans-serif; padding:0px" >
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это индекс единицы данных внутри области действия < em style = "text-align:left" > K< / em > 1; для первой единицы данных
< em style = "text-align:left" > n< / em > = 0< / td >
< / tr >
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< td style = "vertical-align:top; color:#000000; text-align:left; font-size:11px; line-height:13px; font-family:Verdana,Arial,Helvetica,sans-serif; padding:0px" >
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< em style = "text-align:left" > a< / em > < / td >
< td style = "vertical-align:top; color:#000000; text-align:left; font-size:11px; line-height:13px; font-family:Verdana,Arial,Helvetica,sans-serif; padding:0px" >
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это примитивный элемент поля Галуа (2< sup style = "text-align:left; font-size:85%" > 128< / sup > ), соответствующий полиному
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< em style = "text-align:left" > x< / em > (то е с < / td >
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< td colspan = "2" style = "vertical-align:top; color:#000000; text-align:left; font-size:11px; line-height:13px; font-family:Verdana,Arial,Helvetica,sans-serif; padding:0px" >
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< span style = "text-align:left; font-size:10px; line-height:12px" > Остальные символы определены в разделе
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Система обозначений< / a > . < / span > < / td >
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Размер каждой единицы данных всегда равен 512 б а а < / div >
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См. дополнительную информацию, относящуюся к режиму XTS, например, в < a href = "http://www.cs.ucdavis.edu/%7Erogaway/papers/offsets.pdf" style = "text-align:left; color:#0080c0; text-decoration:none" >
[12]< / a > и < a href = "http://csrc.nist.gov/publications/nistpubs/800-38E/nist-sp-800-38E.pdf" style = "text-align:left; color:#0080c0; text-decoration:none" >
[24]< / a > .< / div >
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< a href = "Header%20Key%20Derivation.html" style = "text-align:left; color:#0080c0; text-decoration:none; font-weight:bold.html" > Следующий раздел > > < / a > < / div >
< / div > < div class = "ClearBoth" > < / div > < / body > < / html >
