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134 .TH DES_MODES 7ossl "2023-09-19" "3.0.11" "OpenSSL"
140 des_modes \- the variants of DES and other crypto algorithms of OpenSSL
148 .SS "Electronic Codebook Mode (\s-1ECB\s0)"
149 .IX Subsection "Electronic Codebook Mode (ECB)"
160 .SS "Cipher Block Chaining Mode (\s-1CBC\s0)"
161 .IX Subsection "Cipher Block Chaining Mode (CBC)"
163 Be aware that \fBdes_cbc_encrypt()\fR is not really \s-1DES CBC\s0 (it does
164 not update the \s-1IV\s0); use \fBdes_ncbc_encrypt()\fR instead.
168 The \s-1CBC\s0 mode produces the same ciphertext whenever the same
179 .SS "Cipher Feedback Mode (\s-1CFB\s0)"
180 .IX Subsection "Cipher Feedback Mode (CFB)"
185 The \s-1CFB\s0 mode produces the same ciphertext whenever the same
189 current and all preceding variables and therefore j\-bit variables are
195 The strength of the \s-1CFB\s0 mode depends on the size of k (maximal if
205 .SS "Output Feedback Mode (\s-1OFB\s0)"
206 .IX Subsection "Output Feedback Mode (OFB)"
211 The \s-1OFB\s0 mode produces the same ciphertext whenever the same
213 over, in the \s-1OFB\s0 mode the same key stream is produced when the same
217 The absence of chaining makes the \s-1OFB\s0 more vulnerable to specific attacks.
229 \&\s-1OFB\s0 mode of operation does not extend ciphertext errors in the
233 \&\s-1OFB\s0 mode is not self-synchronizing.  If the two operation of
235 to be re-initialized.
237 Each re-initialization should use a value of the start variable
242 .SS "Triple \s-1ECB\s0 Mode"
243 .IX Subsection "Triple ECB Mode"
248 As for \s-1ECB\s0 encryption but increases the key length to 168 bits.
251 memory, not very likely, even for the \s-1NSA.\s0
261 ecb mode.
262 .SS "Triple \s-1CBC\s0 Mode"
263 .IX Subsection "Triple CBC Mode"
268 As for \s-1CBC\s0 encryption but increases the key length to 168 bits with
269 the same restrictions as for triple ecb mode.
279 \&        Electronic funds transfer \- Requirements for interfaces,
280 \&        Part 5.2: Modes of operation for an n\-bit block cipher algorithm
288 Copyright 2000\-2017 The OpenSSL Project Authors. All Rights Reserved.
292 in the file \s-1LICENSE\s0 in the source distribution or at