Another Challenge of Hash Functions

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NIST Security Strength Time Frames

Security Strength Time Frames of NIST SP 800-57 Part 1 Security Strength 80 112 128 192 256 applying processing applying processing through 2010 acceptable acceptable acceptable acceptable acceptable acceptable acceptable 2011 through2013 deprecated legacy use acceptable acceptable acceptable acceptable acceptable 2014 through 2030 disallowed legacy use acceptable acceptable acceptable acceptable acceptable 2031 and Beyond disallowed legacy use disallowed legacy use acceptable acceptable acceptable Symmetric Algorithms 2TDEA 3TDEA AES-128 AES-192 AES-256 FFC (e.g., DSA, D-H) L = 1024 N = 160 L = 2048 N = 224 L = 3072 N = 256 L = 7680 N = 384 L = 15360 N = 512 IFC (e.g., RSA) k = 1024 k = 2048 k = 3072 k = 7680 k = 15360 ECC (e.g.,ECDSA) f = 160-223 f = 224-255 f = 256-383 f = 384-511 f = 512+ Digital Signatures and hash-only applications SHA-1, SHA-224, SHA-256, SHA-384, SHA-5...
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Use Braces Even For Single Line Statement

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On Feb. 21, 2014, Apple released security update for iOS that affected SSL/TLS connections. The impact is described as "An attacker with a privileged network position may capture or modify data in sessions protected by SSL/TLS." And the CVSS v2 Base Score is 6.8(AV:N/AC:M/Au:N/C:P/I:P/A:P). What's the problem with it? Here is the Apple code : static OSStatus SSLVerifySignedServerKeyExchange(SSLContext *ctx, bool isRsa, SSLBuffer signedParams, uint8_t *signature, UInt16 signatureLen) { ... if ((err = ReadyHash(&SSLHashSHA1, &hashCtx)) != 0) goto fail; if ((err = SSLHashSHA1.update(&hashCtx, &clientRandom)) != 0) goto fail; if ((err = SSLHashSHA1.update(&hashCtx, &serverRandom)) != 0) goto fail; if ((err = SSLHashSHA1.update(&hashCtx, &signedParams)) != 0) goto fail; goto fail; if ((err = SSLHashSHA1.final(&hashCtx, &has...
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JSSE Oracle Provider Preference of TLS Cipher Suites

Perference Order Value Description 1 0xC0,0x24 TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384 2 0xC0,0x28 TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384 3 0x00,0x3D TLS_RSA_WITH_AES_256_CBC_SHA256 4 0xC0,0x26 TLS_ECDH_ECDSA_WITH_AES_256_CBC_SHA384 5 0xC0,0x2A TLS_ECDH_RSA_WITH_AES_256_CBC_SHA384 6 0x00,0x6B TLS_DHE_RSA_WITH_AES_256_CBC_SHA256 7 0x00,0x6A TLS_DHE_DSS_WITH_AES_256_CBC_SHA256 8 0xC0,0x0A TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA 9 0xC0,0x14 TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA 10 0x00,0x35 TLS_RSA_WITH_AES_256_CBC_SHA 11 0xC0,0x05 TLS_ECDH_ECDSA_WITH_AES_256_CBC_SHA 12 0xC0,0x0F TLS_ECDH_RSA_WITH_AES_256_CBC_SHA 13 0x00,0x39 TLS_DHE_RSA_WITH_AES_256_CBC_SHA 14 0x00,0x38 TLS_DHE_DSS_WITH_AES_256_CBC_SHA 15 0xC0,0x23 TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256 16 0xC0,0x27 TLS_ECDHE_RSA_WITH_AES_1...
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