什么是JRE中的黑名单文件

Question

我下载了JRE并在jre/lib/security /里面有一个名为blacklist的文件。内容如下：

# JNLPAppletLauncher applet-launcher.jar 
SHA1-Digest-Manifest: 5Bo5/eg892hQ9mgbUW56iDmsp1k= 

# 7066583 
SHA1-Digest-Manifest: x17xGEFzBRXY2pLtXiIbp8J7U9M= 
SHA1-Digest-Manifest: ya6YNTzMCFYUO4lwhmz9OWhhIz8= 
SHA1-Digest-Manifest: YwuPyF/KMcxcQhgxilzNybFM2+8= 

# 7066809 
SHA1-Digest-Manifest: dBKbNW1PZSjJ0lGcCeewcCrYx5g= 
SHA1-Digest-Manifest: lTYCkD1wm5uDcp2G2PNPcADG/ds= 
SHA1-Digest-Manifest: GKwQJtblDEuSVf3LdC1ojpUJRGg= 

# 7186931 
SHA1-Digest-Manifest: 0CUppG7J6IL8xHqPCnA377Koahw= 
SHA1-Digest-Manifest: 3aJU1qSK6IYmt5MSh2IIIj5G1XE= 
SHA1-Digest-Manifest: 8F4F0TXA4ureZbfEXWIFm76QGg4= 
SHA1-Digest-Manifest: B1NaDg834Bgg+VE9Ca+tDZOd2BI= 
SHA1-Digest-Manifest: bOoQga+XxC3j0HiP552+fYCdswo= 
SHA1-Digest-Manifest: C4mtepHAyIKiAjjqOm6xYMo8TkM= 
SHA1-Digest-Manifest: cDXEH+bR01R8QVxL+KFKYqFgsR0= 
SHA1-Digest-Manifest: cO2ccW2cckTvpR0HVgQa362PyHI= 
SHA1-Digest-Manifest: D/TyRle6Sl+CDuBFmdOPy03ERaw= 
SHA1-Digest-Manifest: eJfWm86yHp2Oz5U8WrMKbpv6GGA= 
SHA1-Digest-Manifest: g3mA5HqcRBlKaUVQsapnKhOSEas= 
SHA1-Digest-Manifest: HSPXCvBNG/PaSXg8thDGqSeZlR8= 
SHA1-Digest-Manifest: iMHjGyv5gEnTi8uj68yzalml8XQ= 
SHA1-Digest-Manifest: jd5MvBoWh7aHiUa1v15lqXVQ9y4= 
SHA1-Digest-Manifest: L0l3WOuMNWujmXo5+O/GtmGyyYk= 
SHA1-Digest-Manifest: l4meuozuSFLkTZTS6xW3sixdlBI= 
SHA1-Digest-Manifest: l93uYyDZGyynzYTknp31yyuNivU= 
SHA1-Digest-Manifest: lbhLWSopUIqPQ08UVIA927Y7jZQ= 
SHA1-Digest-Manifest: nv5+0eBNHpRIsB9D6TmEbWoNCTs= 
SHA1-Digest-Manifest: obWCTaz3uOZwDBDZUsbrrTKoDig= 
SHA1-Digest-Manifest: odqJCMnKdgvQLOCAMSWEj1EPQTc= 
SHA1-Digest-Manifest: OfQZHjo8GK14bHD4z4dDIp4ZFjE=  
SHA1-Digest-Manifest: PVAkXuUCgiDQI19GPrw01Vz4rGQ= 
SHA1-Digest-Manifest: Q9HXbUcSCjhwkgpk5NNVG/sArVA= 
SHA1-Digest-Manifest: qMVUh9i3yJcTKpuZYSFZH9dspqE=  
SHA1-Digest-Manifest: TFYT30IirbYk89l/uKykM6g2cVQ=  
SHA1-Digest-Manifest: trhKo6XiSGxRrS//rCL9e3Ca6D4=  
SHA1-Digest-Manifest: uWffvhFaWVw3lrER/SJH7Hl4yFg= 
SHA1-Digest-Manifest: vSd+kv1p+3jrVK9FjDCBJcoy5us= 
SHA1-Digest-Manifest: WX77FlRyFyeUriu+xi/PE1uLALU= 
SHA1-Digest-Manifest: WyqHV02O4PYZkcbidH4HKlp/8hY= 
SHA1-Digest-Manifest: Y82nn7CFTu1XAOCDjemWwyPLssg= 

# 8002218 
SHA1-Digest-Manifest: saJIx2dYM4ac+paV09g7hyvF7rs= 
SHA1-Digest-Manifest: hYV/Hs2xEIHeidB+9ZVjAtTBr/g= 

有人可以告诉我这是什么文件。我相信它对安全有一些帮助，但我无法弄清楚，也不能从谷歌中找到任何东西。先谢谢你。

Answer 1

请看看这里的解释http://docs.oracle.com/javase/7/docs/technotes/guides/security/blacklistfeature.html