For this and other reasons (flawed, weak, unverifiable or backdoored PRNG) developers should strongly consider using RFC6979 to create deterministic signatures. The k value does not need to be random it only needs to be unknown and used once. Transactions are already unique and the signer has something which is unknown to the public (private key). This means it is possible to sign transactions without needing to rely on "random" elements.
http://tools.ietf.org/html/rfc6979There are implementations in Python, C++, Java, (and when I get a chance to do some refactoring C#).
# Test Vectors for RFC 6979 ECDSA, secp256k1, SHA-256
# private key, message, expected k, expected signature
"01", "Satoshi Nakamoto", "8F8A276C19F4149656B280621E358CCE24F5F52542772691EE69063B74F15D15", "934b1ea10a4b3c1757e2b0c017d0b6143ce3c9a7e6a4a49860d7a6ab210ee3d82442ce9d2b916064108014783e923ec36b49743e2ffa1c4496f01a512aafd9e5"
"01", "All those moments will be lost in time, like tears in rain. Time to die...", "38AA22D72376B4DBC472E06C3BA403EE0A394DA63FC58D88686C611ABA98D6B3", "8600dbd41e348fe5c9465ab92d23e3db8b98b873beecd930736488696438cb6b547fe64427496db33bf66019dacbf0039c04199abb0122918601db38a72cfc21"
"FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364140", "Satoshi Nakamoto", "33A19B60E25FB6F4435AF53A3D42D493644827367E6453928554F43E49AA6F90", "FD567D121DB66E382991534ADA77A6BD3106F0A1098C231E47993447CD6AF2D06B39CD0EB1BC8603E159EF5C20A5C8AD685A45B06CE9BEBED3F153D10D93BED5"
"f8b8af8ce3c7cca5e300d33939540c10d45ce001b8f252bfbc57ba0342904181", "Alan Turing", "525A82B70E67874398067543FD84C83D30C175FDC45FDEEE082FE13B1D7CFDF1", "7063ae83e7f62bbb171798131b4a0564b956930092b33b07b395615d9ec7e15c58dfcc1e00a35e1572f366ffe34ba0fc47db1e7189759b9fb233c5b05ab388ea"
"e91671c46231f833a6406ccbea0e3e392c76c167bac1cb013f6f1013980455c2", "There is a computer disease that anybody who works with computers knows about. It's a very serious disease and it interferes completely with the work. The trouble with computers is that you 'play' with them!", "1F4B84C23A86A221D233F2521BE018D9318639D5B8BBD6374A8A59232D16AD3D", "b552edd27580141f3b2a5463048cb7cd3e047b97c9f98076c32dbdf85a68718b279fa72dd19bfae05577e06c7c0c1900c371fcd5893f7e1d56a37d30174671f6"
"0000000000000000000000000000000000000000000000000000000000000001", "Everything should be made as simple as possible, but not simpler.", "EC633BD56A5774A0940CB97E27A9E4E51DC94AF737596A0C5CBB3D30332D92A5", "33a69cd2065432a30f3d1ce4eb0d59b8ab58c74f27c41a7fdb5696ad4e6108c96f807982866f785d3f6418d24163ddae117b7db4d5fdf0071de069fa54342262"
"fffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364140", "Equations are more important to me, because politics is for the present, but an equation is something for eternity.", "9DC74CBFD383980FB4AE5D2680ACDDAC9DAC956DCA65A28C80AC9C847C2374E4", "54c4a33c6423d689378f160a7ff8b61330444abb58fb470f96ea16d99d4a2fed07082304410efa6b2943111b6a4e0aaa7b7db55a07e9861d1fb3cb1f421044a5"
"fffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364140", "Not only is the Universe stranger than we think, it is stranger than we can think.", "FD27071F01648EBBDD3E1CFBAE48FACC9FA97EDC43BBBC9A7FDC28EAE13296F5", "ff466a9f1b7b273e2f4c3ffe032eb2e814121ed18ef84665d0f515360dab3dd06fc95f5132e5ecfdc8e5e6e616cc77151455d46ed48f5589b7db7771a332b283"
