Why it is hard to decommission a DNS blocklist

Every so often some ex-DNSBL makes the geek news because itsex-operators have gotten tired of people still trying to use it yearsafter it was taken out of service, and to fix this they make theirex-DNSBL return positive answers for every query, thereby blacklistingthe world and insuring that email systems that still use the ex-DNSBLwill bounce everything until they are fixed. Which should happen fast,because people generally notice when they are not getting email.

(Not always, though.)

When


What protects the strength of a ssh connection's encryption

Here is a suddenly burning question: what protectsthe strength of a ssh connection's encryption?

The answer is that the connection encryption is protected only by thestrength of the random numbers chosen for the initial Diffie-Hellmankey exchange that arrangesthe session key. This protection depends on both the server and theclient using strong random numbers; if an attacker can guess the randomnumber for either side, they can immediately recover the session keysimply by acting out that side of the exchange.

The server's host


Opendiary

回到從前,

還未在blogspot開戶的日子,

一直用opendiary記下我的心跳。

仍記得,

那裡發生過美好的愛情。

自由的滋味

親愛的朋友 請告訴我
當我說自由,你會想什麼?

上星期維怡急call搵人幫忙快手快腳錄一首歌(demo)「自由的滋味」
是她幾年前的作品。我十分期待再聽她的歌,這幾年間只聽過一兩次。
她因為要去台灣參與鐡馬影展,順道把歌曲

網上捐款很方便

大家幫幫手~ 香港紅十字會 聯合國兒童基金 世界宣明會

悲傷


因為資訊發達,我們不停看著災難的畫面,心裡只能一直在重覆:“太慘了!太慘了!”仍然埋在瓦礫下的生還者,此時此刻,究竟會在想些什麼?生命無常,在這難過的日子,我們看著電視感受著同胞的傷痛,但心中的悲傷無

賣書之四


家裡完全爆炸,又欠下巨債,又來要求大家支持公益了。寄電郵者會優先考慮,另外提醒各位顧客,若見有人先於自己認投,請別放棄,先給我留個口訊,因為之前說買的人隨時會因為任何原因而放棄的。今期主題是流行書。有

又一成功再生 – Iron Man

一個又一個英雄在電影院裏重生,雖然說英雄片大概都有一種既定模式,情節是重複又重複,但每個英雄都有獨特的人格特徵和奮鬥歷程,都是有血有肉的人。似乎自《蜘蜘俠》以來,荷里活越來越懂得這個道理了?這次的 Iron Man


Things I have learned about ZFS (and a Linux iSCSI target)

I've been testing ZFS over iSCSI storage as an NFS server recently,which has caused me to discover a number of interesting things.In the order that I discovered them:

  • each ZFS pool has a cache that has a minimum size that it won't shrinkbelow, no matter what the memory pressure is; this is apparently10 MB by default. If you have 2 GB of memory on a Solaris 10U4x86 machine and 132 separate pools, there is not enough

示威之都,可以收皮!

(5月2日之後就說要寫的文章,一為反擊,二為打氣。結果現在是5月13日了,我實在應該再快一點。至於另一篇藝發局的文章,遲些再把長版貼出來。)

有評論指,在聖火傳送期間,香港仍有人就六四、人權、西藏等中國