密碼編碼學(xué)與網(wǎng)絡(luò)安全講義-展示頁(yè)
2025-02-26 07:15本頁(yè)面
【正文】 SAESOAEP ? RSAESOAEPENCRYPT((n, e), M, L) – Option: Hash of hLenbyte – MGF mask generation function (output, an octet string) – mLen = k2hLen2 – L optional label to be associated with the message ? |L| = 2^611 octets for SHA1 – EMEOAEP encoding ? EM = 0x00 || maskedSeed || maskedDB – m = OS2IP (EM) – c = RSAEP ((n, e), m) – C = I2OSP (c, k) ? RSAESOAEPDECRYPT (K＝ (n, d), C, L) B EMEOAEP encoding operation PS lH a s h M s eed DB = EM = a ’ M G F ’ M G F 00 00 m a s k ed Seed m a s k ed DB B RSAESPKCS1v1_5 ? RSAESPKCS1V1_5ENCRYPT((n, e), M) – mLen = k – 11 – PS是 kmLen3字節(jié) (至少 8字節(jié) )偽隨機(jī)數(shù) – EM = 0x00 || 0x02 || PS || 0x00 || M – m = OS2IP(EM) – c = RSAEP((n, e), m) – C = I2OSP(c, k) ? RSAESPKCS1V1_5DECRYPT((n, d), C) B Signature schemes with appendix ? SS RSASSAPSS (Probabilistic Signature Scheme) ? new, remended RSASSAPKCS1v1_5 ? obsolete ? RSASSAPSS EMSAPSS＋ RSASP1/RSAVP1 ? RSASSAPKCS1v1_5 EMSAPKCS1v1_5＋ RSASP1/RSAVP1 B RSASSAPSS ? RSASSAPSSSIGN (K=(n,d), M) – EM = EMSAPSSENCODE (M, modBits – 1) – m = OS2IP (EM) – s = RSASP1 (K, m) – S = I2OSP (s, k) ? RSASSAPSSVERIFY ((n, e), M, S) B RSASSAPKCS1v1_5 ? RSASSAPKCS1V1_5SIGN (K＝ (n, d), M) – EM = EMSAPKCS1V1_5ENCODE (M, k) – m = OS2IP (EM) – s = RSASP1 (K, m) – S = I2OSP (s, k) ? RSASSAPKCS1V1_5VERIFY((n, e), M, S) B Encoding methods for signatures with appendix ? EM – EMSAPSS – EMSAPKCS1v1_5 ? EMSAPSS – EMSAPSSENCODE (M, emBits) – EMSAPSSVERIFY (M, EM, emBits) ? EMSAPKCS1v1_5 – EMSAPKCS1v1_5ENCODE (M, emLen) B EMSAPSS encoding operation bc pa dd in g2 m a s k ed DB M M pa dd in g1 m H a s h s a lt s a lt H ’ M G F M ’ = D B = EM = a H a s h H a s h B EMSAPKCS1v1_5 ? EMSAPKCS1v1_5ENCODE (M, emLen) – Option: Hash of hLenbyte – emLen at least tLen + 11 – H = Hash (M) – T = HashID＋ H ( ) ? DigestInfo ::= SEQUENCE { digestAlgorithm AlgorithmIdentifier, digest OCTET STRING } – PS: emLentLen3(8+B) octets with value 0xff – EM = 0x00 || 0x01 || PS || 0x00 || T B 對(duì) HASH的 (in EMSAPKCS1v1_5) ? MD2 ref layman’s guide 30 20 30 0c 06 08 2a 86 48 86 f7 0d 02 02 05 00 04 10 || H ? MD5 30 20 30 0c 06 08 2a 86 48 86 f7 0d 02 05 05 00 04 10 || H ? SHA1 30 21 30 09 06 05 2b 0e 03 02 1a 05 00 04 14
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