CRC16 (ITU-T) As specified by CCITT/ITU-T and used by X.25, V.41, Bluetooth, PPP, IrDA. Polynomial: x^16 + x^12 + x^5 + 1 CRC32 (MPEG-2) As specified in IEEE 802.3, ITU-T V.42 and MPEG-2. Polynomial: x^32 + x^26 + x^23 + x^22 + x^16 + x^12 + x^11 + x^10 + x^8 + x^7 + x^5 + x^4 + x^2 + x + 1 CRC64 (ISO) As specified in ISO 3309 for use by HDLC. Polynomial: x^64 + x^4 + x^3 + x + 1 CRC64 (ECMA) As specified in ECMA-182. Polynomial: x^64 + x^62 + x^57 + x^55 + x^54 + x^53 + x^52 + x^47 + x^46 + x^45 + x^40 + x^39 + x^38 + x^37 + x^35 + x^33 + x^32 + x^31 + x^29 + x^27 + x^24 + x^23 + x^22 + x^21 + x^19 + x^17 + x^13 + x^12 + x^10 + x^9 + x^7 + x^4 + x + 1 MD5 Message-Digest algorithm 5, a 128-bit hash designed at MIT by Professor Ronald Rivest. SHA-1 160-bit Secure Hash Algorithm, developed by the United States National Security Agency and published by NIST.